Question

The plant has an autotrophic nutrition system. In this organisms synthesize their own food, like carbohydrate, from water and $C{O}_2$ with help of chlorophyll in presence of sunlight. This process is known as photosynthesis. What is the correct sequence of reactions which takes place during the photosynthesis process?
$P:\to$ Absorption of light energy of chlorophyll
$Q:\to$ Conversion of light energy into chemical energy
$R:\to$ Reduction of $C{O}_2$ into carbohydrate

• A. Only $P$
• B. Only $P$ and $Q$
• C. $P,Q,andR$
• D. Only $R$

Answer 1

Answer: (C)

$P,Q,andR$

• Chlorophylls are the special pigments that absorb light, usually sunlight. The energy absorbed from light is transferred to energy-storing molecules. Through photosynthesis, the plant uses the stored energy to convert carbon dioxide and water into glucose molecules.
• Photosynthesis is a process in which light energy is converted into chemical energy in the form of sugars.

• The chemical energy is finally stored in carbohydrate molecules when ATP and NADPH are utilized in the dark reaction of the biochemical phase of photosynthesis, thereby reducing $C{O}_2$ into carbohydrates.

Hence, the correct option is C, i.e., P, Q, and R.