Question

Photoautotrophs use

• A. Light as an energy source and can use water and carbon dioxide as a source of electrons for producing organic compounds
• B. Light for an energy and oxygen as a electron source
• C. Inorganic substances for energy and use $C{O}_2$ as carbon source
• D. Light to generate ATP but need organic molecules as a carbon source

Answer 1

The correct option is A Light as an energy source and can use water and carbon dioxide as a source of electrons for producing organic compounds

Photoautotrophs are organisms that carry out photosynthesis using energy from sunlight, converting carbon dioxide and water into organic materials to be used in cellular functions such as biosynthesis and respiration. In an ecological context, they provide nutrition for all other forms of life (besides other autotrophs such as chemotrophs ). They use carbon dioxide and water into organic cell materials using energy from sunlight, starch is produced as final product. This process is an essential storage form of carbon, which can be used when light conditions are too poor to satisfy the immediate needs of the organism.

So the correct option is 'light as an energy source and an use water and carbon dioxide as a source of electrons for producing organic compounds'.