Question

Pigment- containing membranous extensions in some cyanobacteria are
A. Heterocysts
B. Basal bodies
C. Pneumatophores
D. Chromatophores

Answer 1

The plants and organisms have certain pigments which will give them a certain colour or feature. They can help them to trap light and reflect a certain colour. They can use this as camouflage. The various pigments work in a cascade to carry out the functionality.

Complete answer:
Cyanobacteria is the blue-green algae. It can make its food by the bacteriophyll and bacteriopheophytin pigments with membranous extensions in them. They form the residence for the photosynthesis in the bacteria.

Option A: Heterocysts: It is the cell in cyanobacteria that do the nitrogen fixation. Under the presence of oxygen, they do the nitrogen fixation. When there is an absence of fixed nitrogen, the heterocyst is formed.

Option B: Basal bodies: It is a proteinaceous structure at the base of eukaryotes. It is a modified centriole. It serves as a nucleation site for microtubule growth.

Option C: Pneumatophores: These are the roots which grow in the direction of the water and air to reach out to them. They are called the air root.

Option D: Chromatophores: They are the extensions in the cyanobacteria which have chlorophyll and carotenoids to perform the photosynthesis. It is coloured membranous extensions in the algae. They have pigment like bacteriophyll to perform the photosynthesis.

Hence, the correct answer is option (D).

Note: Chromatophores is known as a cell that has a pigment, which gives colour to the plant cells. This provides them with camouflage and a medium of communication. The pigment resides in the thylakoids of the cell. They make one of the defining features of the photosynthetic prokaryotes.