Biological Classification Test - 3

Mycorrhiza is the symbiotic association of fungus with the roots of higher plants. The fungus receives food and shelter from the tree. In return, the fungus absorbs water and minerals from the soil and transports it to the tree, thus helping the tree to grow.

Phytoalexins are chemical substances produced by plants in response to fungal infection and are toxic to fungi.

Virus envelop is made of protein and is called a capsid. It is made of subunits called capsomeres.

Saprotrophic fungi absorb organic matter from dead and decaying plants or animals.

Some fungi such as rusts and smuts grow as parasites on certain crops such as wheat and corn by decomposing their cellulose.

In lichens, the mycobiont part, i.e. fungi are in symbiotic association with the phycobiont part, i.e. algae.

Tobacco mosaic virus (TMV) is an elongated and rod-like plant virus with 95% protein and 5% RNA. The genetic material of TMV is linear, single-stranded and 6500 nucleotides in length. 

Thermoacidophiles are bacteria which can thrive at very high temperatures and in extreme acidic environments.

Cyanobacteria are unicellular, colonial or filamentous organisms. They are also called blue-green algae.

Pigment fucoxanthin present in desmids imparts a golden-brown colour. Hence, they are also called golden algae.

Deuteromycetes is a group of fungi. In them, the sexual reproduction is either absent or unknown. As and when the mode of sexual reproduction was known, the fungi were moved to either ascomycetes or basidiomycetes.

Deuteromycetes reproduce asexually by producing spores called conidia.

Fungi are saprophytes. They absorb organic constituents as their food from dead and decaying matter.