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Physics Chapters

11th Class Chapter seven Physics Long Questions

Dear students, prepare for physics class 11th chapter seven long questions. These important long questions are carefully added to get you best preparation for your 11th class physics ch. seven exams.
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Question: 1
Define bioenergetics and explain types of energy
Answer: 1
1-7
Bioenergetics is the study of energy relationship and energy transformation (conversions) in living organisms
There are many types of energy . Some are given as follows

Question: 2
Why does organisms need energy ?
Answer: 2
2-7
All organisms needs free energy for performing different activities and running various process of metabolism

Question: 3
Define oxidation - reduction reactions .
Answer: 3
3-7
Various life processes in organisms involve constant flow of energy . This energy flow comprises the acquisition , transformation and use of energy for various life processes like growth , movement ,reproduction etc

Redox : Redox reaction involves exchange of electrons between atoms
For all life processes , oxidation-reduction reaction (redox reaction ) are the direct source of energy

Question: 4
What do you know about ATP ?
Answer: 4
4-7
The cell energy currency : The major energy currency of all cells is a nucleotide called adenosine triphosphate (ATP)

Uses of ATP : It is the main energy source for majority of the cellular function like synthesis of macromolecules DNA ,RNA and protein , movement ,transmission , of nerve impulses , active transport , exocytosis and endocytosis . The ability of ATP to store and release energy is due to its molecular structure . It was discovered by karl Lohmann in 1929 Fritz Lipmann in 1941 proposed that ATP is the major energy source in the cell and he got noble prize

Question: 5
Define photosynthesis and write its balanced equation<div><br></div>
Answer: 5
5-7
Photosynthesis : It is the synthesis of glucose from carbon dioxide and water in the presence of sunlight and chlorophyll, with oxygen as a by product

Equation: A simple general equation for photosynthesis is as follows
6CO2 + 12H2O+ Light → C6H12O6 +6O2+6H2O
Question: 6
Write a note on intake of water and carbon dioxide for photosynthesis
Answer: 6
6-7
Intake of water: Water and CO2 are the raw materials of photosynthesis . Plants have mechanism for the intake and transport of these raw materials . Water present in the soil , is absorbed by roots and root hairs through osmosis
Osmosis is the movement of water from a dilute solution to to the concentrated one , through a membrane
This water is eventually transported to leaves through xylem vessels . The air that enters leaf through tiny pores called stomata reached into the air spaces present around mesophyll cells .
Stomata covers only 1-2 % of the leaf surface but they allow much air to pass through them

Question: 7
Explain mechanism of photosynthesis .
Answer: 7
7-7
Photosynthesis occurs in two phases
1: Light reaction
2: Dark reaction