Question

Pneumatophores occurs in plants of
(a) Sandy soil
(b) Saline marshy soil
(c) Marshy soil
(d) Water

Answer 1

Hint: An aerial root system that is specialized for the gaseous exchange in plants. Found mainly in coastal area plants like mangroves arranged in the opposite direction of the usually occurring roots.

Complete answer:
Mangroves grow in the salt marshy soil producing pneumatophore, which is a type of root which grows negatively geotropic for taking in oxygen from the air. They are pencil-like roots that stick up out of the dense, wet ground like snorkels.


Respiratory roots - these roots are found in the plants which grow in marshy areas and are aquatic. In aquatic plants floating roots act as respiratory roots. In marshy areas, the roots are unable to get sufficient oxygen to respire and hence it grows upwards
Mangrove pneumatophores vary in size and morphological characteristics. The black mangroves (Avicennia spp.) have pencil-like or fingerlike pneumatophores, while those of Sonneratia species are conical. Pneumatophores are usually seen as unbranched, but branching can occur when they get damaged. A pneumatophore height is generally measured to have less than 30 cm for Avicennia, less than 20 cm for Laguncularia, and from 30 to 3 m for Sonneratia species, size varies according to the species. Pneumatophore density is typically measured large; as for an example, a 2–3 m-tall Avicennia marina tree usually contains about 10,000 pneumatophores.

So the correct answer is, ‘‘saline marshy soil.’’


Note: Pneumatophores are a type of respiratory root which helps for the respiration for the plants which grow in aqueous and marshy lands and so the roots are grown towards making it negatively geotropic. These aerial roots are beneficial for the coastal plants and control flood and other calamities to an extent.