Question

Photosynthesis is
A. Endothermic process
B. Catabolic process
C. Exothermic process
D. Thermodynamic process

Answer 1

Hint:- Photosynthesis is the only important physico-biochemical process of the world on which the existence of life on earth depends. It is the absorption of light energy and its conversion into stable
chemical potential.

Complete step-by-step solution:-
- Endothermic processes- These are the processes that involve absorption of thermal energy
from the surrounding that increases its enthalpy. This heat energy can be absorbed from
sunlight also.
- Catabolic process- This is the type of process that involves the breakdown of larger molecules
into smaller units.
- Exothermic process- These are the processes that involve the release of thermal energy in the
surrounding produced as a byproduct.
- Thermodynamic process- It is defined as a change from one macro state to another macro
state.
Photosynthesis is the process through which energy rich compounds like carbohydrates are synthesized
from simple inorganic compounds like carbon dioxide and water in the presence of chlorophyll and
sunlight with liberation of oxygen.
Photosynthesis is an endergonic and anabolic process.
It has basically three major phases:
i. The absorption and retention of light energy.
ii. The process of conversion of light energy into chemical potential.
iii. The stabilization and storage of chemical potential.
Plants have a special organelle called chloroplast in their leaves that acts as the site for photosynthesis.
Chloroplast has two types of photosynthetic pigments, chlorophyll which is green in color and
carotenoids. These pigments help in trapping the solar energy for the process.
So, the right option is A.

Note:- Photosynthesis is an important process because all the food we eat, the fuel we burn or the clothes we wear comes directly or indirectly from plants. Plants not only produce their food through photosynthesis but also release oxygen in the process which is required by all animals for respiration.