Question

Lichens are __________

(a) symbiotic existence of blue-green algae and fungi

(b) symbiotic existence of rhizobium bacteria in the roots of leguminous plants

(c) co-existence of coral reef with zooxanthellae

(d) existence of mycorrhiza along with leguminous plants

This question was addressed to me during an online exam.

My query is from Biological Classification in portion Biological Classification of Biology – Class 11

Answer 1

Right answer is (c) co-existence of coral reef with zooxanthellae

Best explanation: Lichens are the co-existence of blue green algae with fungi. Fungus protects the algae from sun light. In turn algae provide nutrition for fungus since fungus cannot prepare its own food due to absence of chlorophyll.