Question

Given figure is of filamentous blue green alga Nostoc. Identify the parts marked as A and B and select the correct option.

• A.

  A	B
  Heterocyst	Mucilaginous sheath

• B.

  A	B
  Vegetative cell	Mucilaginous sheath

• C.

  A	B
  Trichomes	Cell wall

• D.

  A	B
  Mucilaginous sheath	Heterocyst

Answer 1

The correct option is A

A	B
Heterocyst	Mucilaginous sheath

Nostoc is a dark blue-green, jelly-like organism sometimes found in soggy home lawns. Nostoc is in the group with the common name 'blue-green algae', a group often called cyanobacteria. Nostoc cyanobacteria form single-celled threadlike structures called filaments.