9th Class Biology Chapter 2 Short Questions with Answers Solved

Question: 1

What is scientific method?

Answer: 1

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The scientific method in which biological problems are solved, is termed as biological method. Example: Study of Malaria.

Question: 2

Define biological problem.

Answer: 2

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A biological problem is a question related to living organisms that is either asked by someone or comes in biologist's mind by himself.

Question: 3

Define observation.

Answer: 3

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Opinion which is made with the help of five senses of vision, hearing, smell, taste and touch is called observation.

Question: 4

Which steps are taken by biologists to solve a biological problem?

Answer: 4

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Following steps are taken by biologists to solve a biological problem. i. Recognition of biological problem ii. Observations iii. Hypothesis formulation iv. Deductions v. experimentation. vi Summarization of result. vii. Reporting the results.

Question: 5

What is Science?

Answer: 5

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Science is the systemized knowledge derived from observation and experiments these experiments are carried out to determine the principles about how nature operates.

Question: 6

What are different kind of observations?

Answer: 6

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Observations may be qualitative and quantitative.

Question: 7

Different between theory and law.

Answer: 7

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Theory:The hypotheses that stand the test of time are called theories. Example: Cell theory

Question: 8

What is necessary for the formulation of a hypothesis.

Answer: 8

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A great deal of careful and creative thinking is necessary for the formulation of a hypothesis.

Question: 9

What is the importance of biological method?

Answer: 9

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From Galileo's experiment back in 1590s to current research, the biological method contributed to the advancements in medicine, ecology, technology etc, biological method ensure the quality of data for public use.

Question: 10

Define control group.

Answer: 10

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A set up of experiment in which no variable is missing and is a known measures to which scientist can compare their results.

Question: 11

Define hypothesis.

Answer: 11

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The tentative explanation of the observations is called hypothesis.

Question: 12

Give two example of qualitative and two of quantitative observations.

Answer: 12

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Qualitative observations: The freezing point of water is colder than the boiling point. A liter of water is heavier tha a liter of ethanol

Question: 13

What is meaning of malaria?

Answer: 13

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The Italian words "mala" means bad and "aria"means air.

Question: 14

What is quinine?

Answer: 14

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The substance extracted from cinchona bark to treat malaria is caleld pquinine.

Question: 15

What is cinchona?

Answer: 15

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Cinchona is a tree, the bark of which was found to be excellent remedy for treating malaria.

Question: 16

Define experimental group.

Answer: 16

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A set up of experiment in which one variable being tested is kept missing is called experimental group

Question: 17

Write the deduction process.

Answer: 17

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The logical consequences of the hypothesis are called deductions. for this purpose, a hypothesis is taken as true and expected results are drawn from it.

Question: 18

What is the cause of malaria?

Answer: 18

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A tiny creature, plasmodium is the cause of malaria.

Question: 19

Define variable.

Answer: 19

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Variable is a factor being tested in and experiment and is usually compared to a control group.

Question: 20

What are symptoms of malaria.

Answer: 20

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Malaria is diagnoses by having chills and fever with recurring attacks in patients.

Question: 21

What role does this step play in scientific method?

Answer: 21

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Publishing of results is an essential part of the scientific method, it allows other people to verify the results or apply the knowledge to solve other problems.

Question: 22

Define anopheles.

Answer: 22

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Anopheles is a kind of mosquito, female of this mosquito spread malaria in human beings.

Question: 23

How was plasmodium discovered?

Answer: 23

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In 1878 a French army physician Laveran took small amount of blood from a malarial patient and after examining under microscope, noticed some tiny creatures, which after five years was given a name plasmodium.

Question: 24

What is plasmodium ?

Answer: 24

24-154

Plasmodium is a microorganism which completes its life cycle in mosquito and man and causes malaria in animals and humans.

Question: 25

How dowws plasmodium enter the body of a mosquito.

Answer: 25

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When a mosquito bits and sucks the blood of malarial patient the plasmodium enter in it body.

Question: 26

What is biological Method ?

Answer: 26

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The scientific method on which biological problems are solved is called biological method.

Question: 27

Define Law of principle.

Answer: 27

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A theory, which survives doubtful approaches and continues to be supported by experimental evidences, is called law or principle. Example: Mendel's law of inheritance.

Question: 28

How we can say man has always been a biologist?

Answer: 28

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Man has always been a biologist. He had to be biologists. He had to be biologists in order to live The more he knew about animals and their habitat, the more successful hunter he was.

Question: 29

What are the observation of A.F.A king?

Answer: 29

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Some important observation of A.F.A king were people who slept outdoor more likely to get malaria than those who slept indoors.

Question: 30

Define theory.

Answer: 30

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The hypothesis that stand the test of time are called theories. ?A theory is supported by a great deal of evidence. Example: Theory of evolution.

Question: 31

What was the contribution of Ronald Ross to test deductions by A.F. King?

Answer: 31

31-154

Ronald Ross, a British army physician working in India in 1880's allowed female Anopheles mosquito to bite a malarial patient, he killed the mosquito some days later and found plasmodium multiplying in mosquito's stomach.

Question: 32

Differentiate between control and experimental control group ?

Answer: 32

32-154

Control group:Group of healthy persons is called control group

Question: 33

Define Hypothesis?

Answer: 33

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This tentative explanation of observation is called a hypothesis.

Question: 34

Name any one biological problem.

Answer: 34

34-154

Malaria is a biological problem.

Question: 35

Give two example of bioloigical law.

Answer: 35

35-154

Hardy weinberg law , Mendel's law of inheritance.

Question: 36

What is meant by biological problems ?

Answer: 36

36-154

A biological problem is a question related to livings organisms that is either asked by someone or comes in biologist's mind by himself.

Question: 37

Write three steps of solving biological problem?

Answer: 37

37-154

In solving biological problem biologists takes following steps.
Observation
Hypothesis formulation
Deduction.

Question: 38

What is the contribution of A.F.A. king to solve biological problem of malaria.

Answer: 38

38-154

In 1883 a physician. A.F.A. king, made 20 observations then suggested hypothesis that the "Mosquitoes transmit plasmodium and are involved in spread of malaria."

Question: 39

Define ratio.

Answer: 39

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When a relation between two numbers e.t. 'a' and 'b' is expressed in terms of quotient (a/b) such a relation is the ratio of one number to the other it is expressed by putting a (+) division or colon);) mark b/w two numbers.

Question: 40

Write two examples of Biological Laws

Answer: 40

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Two exampes of Biological laws are

Question: 41

Define biological method?

Answer: 41

41-154

The scientific method in which biological problem are solved in termed as biological method.

Question: 42

Difference between Scientific and biological ?

Answer: 42

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Scientific Method:The method which is used by the scientific to sole a problem is called a Scientific method

Question: 43

In which language does the malaria belongs?

Answer: 43

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Malaria belongs to italian words mala mean bad and aria meam air.

Question: 44

Define culex.

Answer: 44

44-154

Culex is a kind of mosquito, female of which spreads malaria in sparrows.

Question: 45

What is meant by reporting of results ?

Answer: 45

45-154

biologists publish their findings in scientific journal and books in talk at national and international meetings and in seminar at colleges and universities

Question: 46

Difference blw law and theory?

Answer: 46

46-154

Law:If a theory survives such doubtful approach and continues to be supported by experimeutal evidence.It become a law of principle.

Question: 47

What is meant by data organization?

Answer: 47

47-154

The collection and rearrangement of information to formulate and to test hypothesis is called data organization.

Question: 48

Write down importance of saliva for mosquito.?

Answer: 48

48-154

The saliva for mosquito prevents the blood from clotting in her food canal

Question: 49

Define data.

Answer: 49

49-154

Data can be defined as the information such as names dates or values made from observations.

Question: 50

Define law and principal.

Answer: 50

50-154

If a theory survives such doubtful approach and continues to be supported by experimental evidence.It becomes a law of principal.

Question: 51

What was the name of first medicine of malaria curing?

Answer: 51

51-154

The bark of a trce known as quina quina was very suitable for curing malaria.

Question: 52

What is Biological Method

Answer: 52

52-154

The scientific method in which biological problems are solved is called biological method

Question: 53

What is the role of biological method in biology?

Answer: 53

53-154

Biological method has played an important part in scientific research for almost 500 years

Question: 54

Define proportion.

Answer: 54

54-154

Proportion means to join two equal ratios by the sing of equality (=) e.g. a:b =c:d is a proportion between two ratio.

Question: 55

Define Observation and Types?

Answer: 55

55-154

As a first step in solving a biological problem biologists recall his/her previous observation or make new ones.Observation are made with five sense of vision hearing smell,taste,touch.

Question: 56

Write down the name of two steps included in biological method ?

Answer: 56

56-154

Recognition of biological problems
Observation
Hypothesis formulation
Deductions
Experimentation

Question: 57

Define theory and law

Answer: 57

57-154

Theory: The hypothesis that stand the test of time often tested and never rejected are called theories

Question: 58

Define bioinformatics.

Answer: 58

58-154

Bioinformatics refers to the computational and statistical techniques for the analysis of biological data.

Question: 59

Define scientific Method ?

Answer: 59

59-154

The method which is used by all scientific to solve a problems is called scientific method.

Question: 60

Define Theory?

Answer: 60

60-154

The hypothesis that stand the best of time are called theory.A theory is supported by a great deal of evidence.

Question: 61

What is trachea?

Answer: 61

61-154

The trachea is 12 cm long tube it lies in front of the esophagus.It is also called as windpipe.These are c-shaped cartilaginous nines in the wall of trachea from collapsing even when these is no air in it.

Question: 62

What is the role of Hypothesis.

Answer: 62

62-154

Biologist organize his her and others observation into into data form and constructs a statement that may prove to be the answer of the biological problem under study.This tentative explanation of observation is called a hypothesis

Question: 63

Differentiate between Dedication and Theory

Answer: 63

63-154

Deduction: Deductions are the logical consequences of purpose a hypothesis is taken as true and expected results deductions are draw from it and are called deductions General in biological method if a particular hypothesis is true then one should expect certain result This involves the use of if then logic

Question: 64

What is difference control group and experimental group?

Answer: 64

64-154

In science when doing the experiment It must be a controlled experiment the scientist must an experiment group with control group.The two group are treated exactly like except for the one variable bing tested.

Question: 65

What is incubation periods?

Answer: 65

65-154

The time period between the entry of parasite in host and appearance of symptoms of its attack is called incubation periods.

Question: 66

Define biological problems?

Answer: 66

66-154

This happen when biological recognize some biological problem and go for it solution biologists takes following steps.Recognition of biological problem observation.
i) Hypothesis Formulation.
ii) Deduction
iii) Experiment.

Question: 67

Why do we do itching after biting of mosquito ?

Answer: 67

67-154

When a female mosquito pierces the skin with her mouth parts she injects a small amount of saliva into the wound before drawing blood.

Question: 68

Define Theory

Answer: 68

68-154

When a hypothesis is given a repeated exposure to experimentation and is not falsified it increases biologists confidence in hypothesis Such well-supported hypothesis may be used as the basis for formulating further hypothesis which are again proved by experimental results The hypothesis that stand the test of time of time are called theories A theory is supported by a great deal of evidence

Question: 69

Define Experiment and their types?

Answer: 69

69-154

The most basic step of biological method is experiment biologist performs experiment to see if hypothesis are true or not.
Control Group
Experimental Group.

Question: 70

Write the role of A.F.A King

Answer: 70

70-154

In 1883 A.F.A king listed 20 observations On the basis of his observations king suggested a hypothesis Mosquitoes transmit plasmodium and so are involved in the spread of Malaria

Question: 71

What is Plasmodium?

Answer: 71

71-154

Plasmodium is seen in the blood of malaria patient.

Question: 72

Define observation and types

Answer: 72

72-154

As a first step in solving a biological problem biologists recallhis/her previous observation or make new ones. Observation are made with five senses of vision hearing smell, taste, touch.

Types are:

Qualitative observation

Quantitative observation

Question: 73

What is scientific law

Answer: 73

73-154

Productive theory keeps on suggesting new hypothesis and so testing goes on Many biologists take it as a challenge and exert greater efforts to disprove the theory If a theory survives such doubtful approach and continues to be supported by experimental evidence it becomes a law or principle A scientific law is a uniform or constant fact of nature It is an irrefutable theory Examples of biological laws Hardy Weinberg law and Mendel's laws of inheritance

Question: 74

Differentiate between Qualitative and quantitative observation ?

Answer: 74

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Quantitative observation are considered more accurate than qualitative one because the former are invariable and measurable and can be recorded in term of number.

Question: 75

How can we find the forth proportion?

Answer: 75

75-154

a:b = c:d is a proportion between the two ratios.The proportion may also be expressed as a:b::c:d.when three values in a proportion are known the fourth one (X) can be calculated.

Question: 76

What do you mean by the word malaria?

Answer: 76

76-154

The Italian words "Mala" means bad and "aria" mean "air"

Question: 77

How we can say man has always been a biologist

Answer: 77

77-154

Man has always been a biologist He had to be a biologist in order to live The more he knew about animals and their habitat the more successful hunter he was

Question: 78

Write two characteristics of good hypothesis.

Answer: 78

78-154

It should be a general statement.
It should be a tentative idea.
It should agree with available observation.
It should be kept as simple as possible.

Question: 79

Define Science?

Answer: 79

79-154

Science is the systemized knowledge derived from observation and experiment.

Question: 80

What is meant by observation ?

Answer: 80

80-154

As the first step in solving a biological problems, biologist recalls his/her pervious observation or makes new one

Question: 81

What is meant by Productive Theory

Answer: 81

81-154

The theory that keep on suggesting new hypothesis and so testing goes on is called productive theory

Question: 82

What do you known Quina?

Answer: 82

82-154

Quina is an effective drug for treating malaria.

Question: 83

What is meant by Summarization of results ?

Answer: 83

83-154

Biologist collect the actual and quantitative data from his experiments data from his experiments.
An average data is collected form every experimental group and than statistical comparison is made
for final conclusion biologist also makes statistical analysis

Question: 84

Was the ancient physician familiar with malaria?

Answer: 84

84-154

In ancient time physiam were familar with malaria.They described it as a disease of chills and fever with recurring attacks.

Question: 85

Differentiate between Control and Experimental control group

Answer: 85

85-154

Control Group: Group of healthy persons is called control group

Example: In an experiment to test a necessity of carbon dioxide for photosynthesis plant with freely available carbon dioxide is control group

Question: 86

What is meant by control in experiments?

Answer: 86

86-154

Control Experiments:

When an experiments is done, it is a controlled experiments.
In the Experiments, Scientific compare experiments group to control group
Both groups are kept in same environment expect the testable variable

Question: 87

Define Nostrils.

Answer: 87

87-154

The nose encloses the nasal cavity.It opens to the outside through the openings called the nostrils.

Question: 88

Define Ratio and Proportion

Answer: 88

88-154

Ratio: When the relation between a and is expressed in the form of quotient then such relation is called a ratio A two quantities For example the ratio between 50 malarial patient and 150 healthy patients is 1.3

Question: 89

What is female Anopheles and to which diseases it related ?

Answer: 89

89-154

Female Anopheles is a mosquito which spreads plasmodium it relates to malaria.

Question: 90

What is proportion?

Answer: 90

90-154

Proportion mean to join two equal ratios by sign of equality(=).

Question: 91

Define Nasal Cavity?

Answer: 91

91-154

Nasal cavity is the hallow space in the nose open to the outside through nostrils and divided in to two portions by a wall.

Question: 92

What is the relation of Cinchona with quina-quina

Answer: 92

92-154

Many plants from America were sent back to Europe to be used as medicines The bark of a tree known as quina- quina was very suitable for curing fevers It was so beneficial that soon it was impssible to carry enough bark to Europe Some dishonest merchants began to substitute the bark of another tree cinchona a which closely resembled quina- quina This dishonesty proved much valuables for mankind Cinchona bark was found to be excellent for treating malaria

Question: 93

Explain Deduction?

Answer: 93

93-154

Deduction are the logical consequences of hypothesis.For this purpose a hypothesis is taken as true and expected results are drawn from it

Question: 94

What do you know Quina?

Answer: 94

94-154

Quina is an effective drug for treating malaria

Question: 95

Name the effective medicine?

Answer: 95

95-154

Quinine is an effective medicine.

Question: 96

How is a scientific law formed?

Answer: 96

96-154

productive theory keeps on suggesting new hypothesis and so testing goes on.many biologists take it as a challenge and exert greater efforts to disprove the theory.

Question: 97

What was the biologist,observation about malaria?

Answer: 97

97-154

Biologist were having following observation.Malaria is associated with marshes.Drinking water of marches does not cause malaria.From these observation it can be concluded that plasamodium was not in marsh,water.But it must be carried by something that comes to marsh water.

Question: 98

Write down two controls of malaria.

Answer: 98

98-154

controls of malaria:

If sleeping place are open then use smokey fire to keep away mosquitoes.
Use for wire guaze on windows and doors are keep away mosquitoes to control malaria
Use of mosquitoes repellent in the form of location on the skin

Question: 99

What are different formats of Data Organization

Answer: 99

99-154

In order to formulate and then to test hypothesis scientists collect and organize data Prior to conducting an experiment it is very important for a scientist to describe data collection methods It ensures the quality of experiment Data is organized in different formats like graphics tables flow charts, maps and diagrams

Question: 100

How many senses are found in man?

Answer: 100

100-154

Five sense are found in man.

Question: 101

What is the importance of Data analysis in biological method

Answer: 101

101-154

Data analysis is necessary to prove or disprove a hypothesis by experimentation in biological method It is very important steep as it transforms raw data into information which can be used to summarize and report results. The data organizations and data analysis are important steps in the biological methods date or values made from observations and experiments It is done through the application of statistical method. i.e ratio and proportion

Question: 102

What is meant by Biological Problem

Answer: 102

102-154

A biological problem is a question related to living organisms that is either asked by someone or comes in biologist mind by himself

Question: 103

In which mosquito plasmodium is found?

Answer: 103

103-154

Mosquitoes transmit plasmodium and so are involved in the spread of malaria.

Question: 104

Write two example of biological Laws ?

Answer: 104

104-154

Hardy-Weinberg Law
Mendel's Law

Question: 105

What is statistics?

Answer: 105

105-154

Statistics is the brameh of mathematics dealing with data collection organization analysis interpretation and presentation.

Question: 106

Define Hypothesis

Answer: 106

106-154

Tentative explanation of observations is called hyhpothesis

Question: 107

How aedes mosquito spreads dengue fever ?

Answer: 107

107-154

When Aedes mosquito bits on skin of any person then it pierces the skin with its mouth parts and sucks blood and injects a small amount of saliva there.

Question: 108

Write down two benefits of Productive Theory

Answer: 108

108-154

Benefits of productive Theory: A productive theory produces new hypothesis and its further testing goes on

If Any productive theory can not be falsified then it becomes a law or Principle

Question: 109

How Reporting the Results occurs

Answer: 109

109-154

Biologist publish their findings in scientific journals and books in talks at national and international meetings and in seminars at colleges and universities

Question: 110

Differentiate between culex and Aedes moquitoes?

Answer: 110

110-154

Culex moquitoes:Culex moquitoes are responsible for malaria in sparrow.

Aedes moquitoes:Aedes moquitoes are responsible for the dengue fever in human.

Question: 111

Why female mosquito inject saliva wound before drawing blood.?

Answer: 111

111-154

A female mosquito injects a small amount of saliva into the wound before drawings blood. so that, the saliva prevents the blood from clotting in her food canal, due to presence of anti-coagulant.

Question: 112

Write down the names of steps included in Biological method

Answer: 112

112-154

To solve a problem in biology a biologist takes following steps

Recognition of biological problem

Observations

Hypothesis formulation

Deductions

Experimentation

Summarization of results

Reporting the results

Question: 113

Write two observation of A.F.A king ?

Answer: 113

113-154

People who slepts outdoor were more likely to get malaria than those who spent indoors.
People who slepts under fine net were less likely to get malaria than those who did not use such nets.
Individual who slept near a smokey fire usually did not get malaria

Question: 114

What is Bio-Informatics

Answer: 114

114-154

Bioinformatics refers to the computational and statistical techniques for the analysis of biological data

Note no board has taken any question

Question: 115

What were the four major observations of malaria in the last part of 19th century

Answer: 115

115-154

Malaria and marshy areas have some relation

Quinine is an effective drug for treating malaria Drinking the water of marshes does not cause malaria

plasmodium is seen in the blood of malarial patients

Question: 116

What is the relation of Cinchona with quina-quina ?

Answer: 116

116-154

Many plants of america were sent back to Europe to be used as medicines. the brak of a tree known as quina-quina. Was very suitable for curing fevers

Question: 117

Differentiate between Scientific and Biological method

Answer: 117

117-154

The method which is used by all scientists to solve a problem is called scientific method

Question: 118

Define biological method

Answer: 118

118-154

The scientific method in which biological problem are solved in termed as biological method

Question: 119

What were four observation of malaria in the last part of 19th century?

Answer: 119

119-154

Malaria and marshy areas have some relation.
Quinine is an effective drug for treatingmalaria.
Drinking the water of marshes does not casemalaria.
Plasmodim is seen in the blood ofmalaria patients.

Question: 120

Why female mosquito inject saliva in to wound before drawing blood

Answer: 120

120-154

A female mosquito injects injects a small amount of saliva into the would before drawing blood So that the saliva prevents the blood from from clotting in her food canal due to presence of anti coagulant

Question: 121

What is proportion?

Answer: 121

121-154

Proportion mean to join two equal ratios by sign of equality (=)

Question: 122

What is meant by Productive Theory ?

Answer: 122

122-154

The theory that keep on the suggesting new hypothesis and so testing goes on is called productive theory

Question: 123

Define Theory ?

Answer: 123

123-154

The hypothesis that stand the test of time are called theory. A theory is supported by a great deal of evidence.

Question: 124

What is role of Biological method in Biology

Answer: 124

124-154

Biological method has played an important part in scientific research for almost 500 years From Galileo's experiment in the 1590s to current research the biological method has contributed to the advancements in vaccine medicine ecology technology etc Biological method also ensures the quality of data for public use Over population discovery of new diseases and mutations in germs are factors which are responsible to change the environment of globe only biological method can play an important role to save our next generations

Question: 125

Write down contribution of French Army physician Laveran?

Answer: 125

125-154

In 1883, a French Army physician Laveran began to search for "cause" of malaria. He took a small amount of microscope

Question: 126

What do you mean by the word malaria

Answer: 126

126-154

The Italian words Mala means bad and aria mean air

Question: 127

Define theory and laws ?

Answer: 127

127-154

Theory:The hypothesis that stand the test of time often tasted and never rejected are called theory

Question: 128

How Hypothesis is made

Answer: 128

128-154

Biologist organizes his her an others observations into data form and constructs a statement that may prove to be the answer of the biological problem under study This tentative explanation of observations is called a hypotheses

Question: 129

Define Scientific Method

Answer: 129

129-154

The method which is used by all scientists to solve a problem is called scientific method

Question: 130

What is meant by Summarization of Results

Answer: 130

130-154

Summarization of Results: Biologist collects the actual and quantitative data from m his experiments

An average data is collected from every experimental group and then statistical comparison is made

For final conclusion biologist also makes statistical analysis

Question: 131

At which Quantitative observation is more accurate than Quantitative

Answer: 131

131-154

Quantitative observations are considered more accurate than qualitative one because the former are invariable and measurable and can be recorded in terms of numbers

Question: 132

What is meant by Control in Experiments

Answer: 132

132-154

Control in Experiment: When an experiment is done It is a controlled experiment

In this experiment Scientist compares experimental group to control group

Both groups are kept in same enviroment except the testable variable

Question: 133

Write characteristics of a Hypothesis

Answer: 133

133-154

It should be a general statement

It should be a tentative idea

It should agree with available observations

It should be kept as simple as possible

It should be testable and potentially falsifiable

Question: 134

Why do we do itching after biting of mosquito

Answer: 134

134-154

When a female mosquito pierces the skin with her mouth parts she injects a small amount of saliva into the wound before drawing blood This kind of saliva is a cause of Itching

Question: 135

Define law and principal

Answer: 135

135-154

if a theory survives such doubtful approach and continues to be supported by experimental evidence. It becomes a law of principal.

Question: 136

Differentiate between culex and Aedes moquitoes

Answer: 136

136-154

Culex mosquitoes Culex mosquitoes are responsible for malaria in sparrow

Question: 137

What is meant by observation

Answer: 137

137-154

As the first step in solving a biological problem biologist recalls his previous observations or makes new ones observations are made with five senses of vision hearing smell taste and touch

Question: 138

What is meant by Deduction

Answer: 138

138-154

Deductions are the logical consequence of hypothesis For this purpose a hypothesis is taken as true and expected results are drawn from it General in biological method if a particular hypothesis is true then one should expect a certain result This involves the use of if then logic

Question: 139

Define hypothesis ?

Answer: 139

139-154

this tentative explanationof observation is called a hypothesis.

Question: 140

Write down importance of saliva for mosquito

Answer: 140

140-154

The saliva of mosquito prevents the blood from clotting in her food canal

Question: 141

What are the observation of AFA King?

Answer: 141

141-154

Some important observation of AFA King were

people who slept outdoormore likely to get malaria than those who slept indoors

Individual who slept neat a smoky fire usually did not get malaria

Question: 142

What is female Anopheles and to which disease it relates

Answer: 142

142-154

Female Anopheles is a mosquito which spreads plasmodium and it relates to malaria

Question: 143

In which mosquito plasmodium is found?

Answer: 143

143-154

Mosquitoes transmit plasmodium and so are involved in the spread of malaria.

Question: 144

Write down contribution of French Army physician Laveran

Answer: 144

144-154

In 1878 a French army physician Laveran began to search for cause of malaria He took a small amount of blood from a malarial patient and examined it under microcope He notices some tiny living creatures His discovery was not believed by other scientist Two years later another physician saw the same creatures in the blood of another malarial patient Three years after the second discovery the same creature s were observed for third time The organism was given a name Plasmodium

Question: 145

What was the biologist, observation about malaria?

Answer: 145

145-154

Biologist were having following observation

Malaria is associated with marshes

Drinking water of marches does not cause malaria. Form these observationit can be concluded that plasmodiumwas not in march water But it must be carried by something that come to march water,

Question: 146

What is plasmodium

Answer: 146

146-154

Plasmodium is seen in the blood of malaria patients

Question: 147

Write down two controls of malria control of Malaria

Answer: 147

147-154

If sleeing places are open then use smoky fire to keep away mosquitoes

Use of wire gauze on windows and doors to keep away mosquitoes to control malaria

Use of mosquito Repellent in the form of lotion on the skin

Question: 148

Write down the important observations of A.F.A King

Answer: 148

148-154

Important observations of A.F.A King: People who slept outdoors were more likely to get malaria than those who slept indoors

People who slept under fine nets were less likely to get malaria than those who did no use such nets

Individuals who slept near a smoky fire usually did not get malaria

Question: 149

Difference between law and theory?

Answer: 149

149-154

Law :

If a theory survives such doubtful approach and continuesto be supported by experimental evidence. It become a law of principle

Question: 150

What is Incubation Periods

Answer: 150

150-154

The time period between the entry of parasite in host and appearance of symptoms of its attack is known as Incubation period

Question: 151

What is difference between control group and experimentalgroup?

Answer: 151

151-154

In science when doing the experimentit must be a controlled experiment the scientists must contrastin experiment group with control group . The two groupare treated exactly alike except for the one variable bing tested

Question: 152

In which language does the malaria belongs

Answer: 152

152-154

Malaria belongs to Italian words malamean bad and aria mean air

Question: 153

How Aedes mosquito spreads Dengue fever

Answer: 153

153-154

When Aedes mosquito bites on the skin of any person then it pierces the skin with its mouth parts and such blood and injects a small amount of saliva there This saliva contains germs of Dengue which latter causes Dengue fever

Question: 154

What is the causes of malaria?

Answer: 154

154-154

Plasmodium is the cause of malaria

Biology Chapters

9th Class Chapter 2 Biology Short Questions

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