Which of the following is the main role of photosynthesis on Earth?
a
Supply needed reactants for cellular respiration
b
Generate oxygen for the atmosphere
c
Provide food for organisms that do photosynthesis
d
All above responses are correct
d) All above responses are correct
d. All above responses are correct.
Photosynthesis plays a crucial role on Earth by supplying needed reactants for cellular respiration, generating oxygen for the atmosphere, and providing food for organisms that conduct photosynthesis.
The correct answer is option d: All of the above responses are correct.
To confirm this answer, we will explain each option and how photosynthesis contributes to each role:
a) Supply needed reactants for cellular respiration: Photosynthesis converts carbon dioxide and water into glucose (a sugar) and oxygen. The glucose produced through photosynthesis is used as a source of energy during cellular respiration, where it is broken down in the presence of oxygen to release energy for the functioning of cells.
b) Generate oxygen for the atmosphere: Photosynthesis is the primary process that generates oxygen on Earth. Oxygen is produced as a byproduct when plants, algae, and some bacteria carry out photosynthesis. This released oxygen is then released into the atmosphere, supporting the survival of aerobic organisms, including humans and most animals.
c) Provide food for organisms that do photosynthesis: Photosynthesis is the primary source of food production for organisms that can carry out this process. Plants are capable of photosynthesis and produce complex organic compounds like carbohydrates, proteins, and lipids. Other organisms, such as herbivores, rely on these plants for sustenance. Carnivores ultimately depend on photosynthesis since they obtain their energy from the consumption of plants or other animals that have consumed plants.
Therefore, the main role of photosynthesis on Earth is to supply the needed reactants for cellular respiration, generate oxygen for the atmosphere, and provide food for organisms that do photosynthesis.