Question

Photoautotrophs use ______.

Options

• light as an energy source and can use water or hydrogen sulphide as a source of electrons for producing organic compounds

• light for an energy and oxygen as a electron source

• inorganic substances for energy and use CO₂ as carbon source

• light to generate ATP but need organic molecules as a carbon source

Answer 1

Photoautotrophs use light as an energy source and can use water or hydrogen sulphide as a source of electrons for producing organic compounds.

Explanation:

Photoautotrophs capture light energy to produce organic molecules through photosynthesis. Some photoautotrophs, such as cyanobacteria, use water as the electron donor, releasing oxygen (oxygenic photosynthesis), while others, like certain sulfur bacteria, use hydrogen sulphide as the electron donor (anoxygenic photosynthesis).