Q. How many organisms in the list given below are autotrophs ? Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter, Streptomyces, Sacharomyces, Trypanosoma, Porphyra, Wolfia
A) Four
B) Five
C) Six
D) Three
Explanation
[Solution from source] Autotrophs make their own food: Nostoc, Chara, Porphyra and Wolffia are photosynthetic, while Nitrosomonas and Nitrobacter are chemoautotrophs, giving six. Lactobacillus, Streptomyces, Saccharomyces and Trypanosoma are heterotrophs, so counting only the photosynthetic ones (four) is the trap. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.