Question

Which one of the following is NOT an example of mutualism?

• A. Plasmodium and Man
• B. Ruminants and bacteria
• C. Mycorrhiza
• D. Lichen

Hint:

Mutualism is when both organisms benefit from the relationship, whereas parasitism harms one of the organisms.

Answer 1

The Correct Option is A

Step 1: Understanding mutualism.
Mutualism is a symbiotic relationship where both organisms benefit. Plasmodium and humans, on the other hand, have a parasitic relationship where Plasmodium benefits at the expense of the human.
Step 2: Analyzing the options.
(A) Plasmodium and Man: Correct, this is a parasitic relationship, not mutualism.
(B) Ruminants and bacteria: Incorrect, this is mutualism as both the bacteria and the ruminant benefit from each other.
(C) Mycorrhiza: Incorrect, mycorrhiza is a mutualistic relationship between fungi and plant roots.
(D) Lichen: Incorrect, lichen is a mutualistic association between algae and fungi.
Step 3: Conclusion.
The correct answer is (A) Plasmodium and Man, as this is a parasitic, not mutualistic, relationship.