In photosynthesis carbon dioxide is converted to carbohydrates. It is a _______process.
A. Reductive.
B. Oxidative.
C. Catabolic and Exergonic.
D. Reductive, Anabolic and Endergonic.

Hint:- Photosynthesis involves many kinds of conversion that involves sunlight. Here, there are many nutrients such as proteins, vitamins, carbohydrates are involved in this process. As we have already learnt, it can be found based on the nutrients and their conversions. Based on this, it can be easily determined and analyzed.

Complete Answer:- Photosynthesis is the process which involves plants and other organisms that converts light energy to chemical energy. This is more responsible for oxygen content. It mostly occurs in the chloroplast which is present in the leaves. Maximum photosynthesis occurs in the red light.
The following are some of the processes which are involved in photosynthesis. They are as follows:
- Anabolic process
- Catabolic process
- Reductive process
- Endergonic process
- Exergonic process

ANABOLIC PROCESS: It acts as a complete opposite of the catabolic process. It is state in which it occupies no
energy to occur.

CATABOLIC PROCESS: It is a process of breaking down molecules into smaller units which are oxidized to release energy.Example: Glycolysis

REDUCTIVE PROCESS: It is a process that changes from one form to another. It is a process of reducing.

ENDERGONIC PROCESS: It is the same as anabolic process. It absorbs energy in the form of work.

EXERGONIC PROCESS: It is a process in which it releases the energy in the form of work.
These are some of the processes which are involved in photosynthesis. So, from the above-mentioned definitions it is clear that the correct answer is Option D.
 ADDITIONAL INFORMATION:
 - Photosynthesis has the two-pigment system theory and it was proposed by Emerson. Here, the water-soluble pigment which is involved is known as Anthocyanin.
- The following are some of the factors which affect photosynthesis. They are:
- Concentration of carbon dioxide
- Pollution
- Temperature
- Light irradiance and wavelength
- These are some influencing rates of photosynthesis. They are:
- Minerals
- Carbon dioxide
- Water
- Light intensity and temperature
IMPORTANCE:
- Photosynthesis is responsible for the production of oxygen.
- This serves as the crucial role in the food chain.
- In this process, the major nutrient oxygen is very much needed by most of the living organisms for their survival.
Hence, the correct answer is Option D.

Note:- Here, in the process of photosynthesis the plant fixes carbon dioxide to various compounds. This involves synthesis of glucose from carbon dioxide and water. So, this is known as anabolic process. This process also involves oxidation of water that releases electrons, those electrons released during photolysis are picked up by a molecule called NADP which changes from oxidized state from reduced state, which is known as an endergonic process.