Ques. 1AIPMT 2001
What is true for photolithotrophs?
- Obtain energy from radiations and hydrogen from organic compounds
- Obtain energy from radiations and hydrogen from inorganic compounds
- Obtain energy from organic compounds
- Obtain energy from inorganic compounds
Answer
(2) Obtain energy from radiations and hydrogen from inorganic compounds
Solution
Photo- ⇒ energy is obtained from light (radiations).
-litho- ⇒ the hydrogen (electron) donor is an inorganic compound (e.g. H2O, H2S).
Organisms using organic compounds as hydrogen donors are photo-organotrophs, and those obtaining energy from chemical oxidation are chemotrophs.
∴ Photolithotrophs obtain energy from radiations and hydrogen from inorganic compounds.
Answer: (2)