Question

In photosynthesis energy from light reaction to dark reaction is transferred in the form of
A. ADP
B. ATP
C. RUDP
D. Chlorophyll

Answer 1

Hint: Photosynthesis occurs in autotrophs such as green plants and the entire process of photosynthesis is divided into two phases, light reactions and dark reactions. Light reactions are the light-dependent and dark reactions are the light-independent stage. During light reactions, green plants absorb light energy.

Complete answer:
Light-dependent reactions occur in the thylakoid of chloroplast where chlorophyll molecules are located. During the light reactions, chlorophyll molecules absorb sunlight and convert light energy into ‘assimilatory power’. Assimilatory power includes ATP and NADH. NADH is an electron carrier molecule of nicotinamide adenine dinucleotide phosphate (NADPH) and ATP (adenosine triphosphate ). Oxygen is also released from water during light reaction.
ATP is an energy currency which stores in its terminal bond.
The ATP and NADPH supply energy to fix or reduce carbon dioxide into glucose. The reduction of carbon dioxide to glucose occurs in the stroma of the chloroplast.
The Calvin cycle or dark reactions are independent of light but these enzymatic reactions depend on the energy produced during light reactions. Without light reactions, carbon dioxide cannot be reduced to glucose.

Thus, option B. ATP is the correct answer.

Note:
Sun energy is converted into assimilatory power the chloroplast of green living cells. Assimilatory power is the power of plants in the form of ATP and NADPH to obtain food in the form of carbohydrates from the reduction of carbon dioxide.