The process, by which green plants prepare their own food is known as:
Photosynthesis
The correct option is A:
Explanation of correct option:
Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.
With the process of photosynthesis, plants can prepare their food.
Explanation of incorrect answer:
Option B:
Respiration is defined as a metabolic process wherein, the living cells of an organism obtain energy (in the form of ATP) by taking in oxygen and liberating carbon dioxide from the oxidation of complex organic substances.
Option C:
If two different types of organisms live and work together for their mutual benefit, their relationship is called symbiosis.
Option D:
None of these can be an option because option A is correct.
Final answer: The process, by which green plants prepare their food is known as photosynthesis.