Question

The first step for initiation of photosynthesis will be

• A. Formation of ATP
• B. Ionization of water
• C. The excitement of an electron of chlorophyll by a photon of light
• D. Joining of a 3-carbon atom to form glucose

Answer 1

The correct option is C

The excitement of an electron of chlorophyll by a photon of light

The correct option is C.

Explanations for the correct option:

1. Photosynthesis is the process by which autotrophic organisms convert light energy into chemical energy.
2. A photon of light enters the leaf and reacts with the chlorophyll molecule.
3. The photon molecule excites the chlorophyll atom and causes the release of a free atom from the chlorophyll molecule.

Explanations for the incorrect options:

Option A:

ATP molecules are formed by the light reaction of photosynthesis by photophosphorylation.

Option B:

Ionization of water occurs during the light phase of photosynthesis and is split to generate oxygen, protons, and electrons.

Option D:

In the second stage of photosynthesis, the ATP molecules generated are used to convert 3-PGA molecules into glyceraldehyde-3-phosphate, a three-carbon sugar.

Final answer: The first step for initiation of photosynthesis will be the excitement of an electron of chlorophyll by a photon of light.