Question

In a genus A modified root become aerial and grows vertically upwards (negatively geotropic) and in a genus B modified adventitious aerial roots grow vertically downwards (positively geotropic) A and B are respectively

(A) Zea mays, Pisum (B) Rhizophora, Ficus
(C) Zea mays, Rhizophora (D) Vanda, Rhizophora​

Answer 1

Answer:

Rhizophora, Ficus

Explanation:

b is the correct answer

pls mark the brainliest

Answer 2

Answer: The correct option is (B)- Rhizophora, Ficus

Explanation:

• POSITIVE GEOTROPISM is the movement of a plant part towards gravity. For example, roots grow in the soil.

• NEGATIVE GEOTROPISM is the movement of a plant part against gravity. For example, the trunk or shoots grow out of the ground.

The main function of roots is to absorb water and minerals from the soil. However, the roots are also modified to perform various other functions. The roots of some plants act as stores for food, some provide support to gigantic plant structures, while others absorb oxygen from the atmosphere.

For Example-

• Banyan tree: The banyan tree (Ficus benghalensis) has massive column-like adventitious roots originating from the aerial part of the trunk. These roots grow towards the ground (POSITIVE GEOTROPISM) and provide support to the tree. Such roots are called prop roots.

• Mangrove tree: The roots of mangrove plants (for example, plants such as Rhizophora, Sonneratia, and Avicennia) grow vertically upwards from the soil to absorb oxygen from the atmosphere as the soil is poorly aerated (NEGATIVE GEOTROPYSM). Such roots are called pneumatophores.