Question

1.define cuticle inwhich part of the plant it is absennt?

2.what is the significance of nostoc?

Answer 1

A waxy or hard protective layer over a living tissue is called cuticle. In plants it is present in the aerial parts lining the shoot, leaves etc. It prevents water loss from the plant.

Roots in the plant lack cuticle.

Nostoc is an important nitrogen fixing bacteria. It can exist in colonies or independently in terrestrial and aquatic media. It is known for its symbiotic associations with mosses, ferns etc. It is a valuable agricultural input which increases fertility of the soil.