Question

When two organisms are mutually beneficial for each other, it is called symbiotic relationship.
For e.g. Lichen is the symbiotic relationship between algae and fungi. Fungi provides shelter to the algae whereas algae provides nutrition to fungi.
Select the options in which organisms are mutually beneficial for each other from the following.

• A.
• B.
• C.
• D.

Answer 1

Answer: (A), (B), (D)

The correct options are
A
B
D

a. Rhizobium is found in the root nodules of leguminous plants.
Rhizobium takes shelter in the root nodules of the plant and in return, it helps the plant in nitrogen fixation.

b. Egrets and cattle: They roam alongside each other in the fields. The cattle feeds on the lush grass and the egret feeds on the cattle’s ticks and other harmful pests. Thus, ergets get their food whereas cattles get rid from the ticks.

c. Insectivorous plants like Drosera, and Nepenthes grow on nitrogen deficient soil. To fulfill their nitrogen requirements, they trap and digest insects. Here, only plant is benefitted, thus it is not an example of symbiotic relationship.

d. E.coli takes shelter and nutrition in large intestine and in return, it provides vitamin B complex.