Question

Azolla has a symbiotic relationship with
A. Chlorella
B. Anabaena
C. Nostoc
D. Tolypothrix

Answer 1

There are various interactions between animals in nature. They help each other to co-exist either by benefiting or harming each other. This relationship is very specific. It sometimes makes them sensitive to some growths making them indicators for the same.

Complete answer:
Symbiotic relationship is when two organisms interact with each other in such a way that either one or both of them are benefitted.
Azolla is used as animal feed and water purifier. It is used in biogas production. It can be supplied with the fertilizers.

Option A: Chlorella: It is an alga living in freshwater. It is used as a supplement and medicine. It is free living.it can sometimes live in a commensal relationship with invertebrates.

Option B: Anabaena: Anabaena lives in a symbiotic relationship with Azolla. Azolla is a fern. Azolla provides the Anabaena with a safe environment for nitrogen exchange.

Option C: Nostoc: Nostoc is found in moist areas at the bottom of lakes. It fixes the atmospheric nitrogen in the nitrogen fewer areas. It forms a symbiotic relationship with hornworts and gunnera

Option D: Tolypothrix: It is also a green alga found floating or attached to the plants and rocks. They have filamentous bodies.

Hence, the correct answer is option (B).

Note: Azolla is called the mosquito fern due to its appearance over lakes, the mosquitoes are prevented from laying their eggs. Azolla in some parts of the world is eaten as a nutrient-rich source. It's used as green manure for fertilizing the soil.