Question

Read the given statements and select the correct ones.
(i) Root caps are present in prop roots.
(ii) Pneumatophores help to get oxygen for respiration
(iii) Edible part of ginger is the underground stem.
(iv) Hydrophytes usually possess a well developed root system

A) (i) and (ii) only
B) (ii) and (iii) only
C) (i), (ii) and (iii)
D) (i) , (ii), (iii) and (iv)

Answer 1

Hint:Root cap is a plant tissue usually present at the apex or a tip of the plant root. It is also called calyptra. Pneumatophores are specialised roots and hydrophytes are those plants which grow in water.

Complete answer:
Let us analyse the given statements to find the correct answer.
>Statement (i) Prop roots are adventitious roots and they are also called Pillar roots. They are thick and originate from the horizontal aerial branches of a tree. They have root caps at their apex. Root caps are seen in prop roots of a Banyan tree. Hence, this is a correct statement.
>Statement (ii) Pneumatophores are specialized aerial roots.They grow above the ground and help in aerial respiration. They are also called breathing roots and thereby obtain Oxygen for respiration. Pneumatophores are present in mangrove trees. Hence, this is the correct statement.
>Statement (iii) The edible part of a Ginger is a rhizome which is a modified stem that grows underground. Hence, this is the correct statement.
>Statement (iv) Hydrophytes are plants that grow in or on water. They have a reduced presence of a root system as it would be a waste to absorb extra water through roots. Sometimes they completely lack a root system. Hence, this is an incorrect statement.

Thus, the correct answer is option (C) (i), (ii) and (iii).

Note:
i) Hydrophytes absorb water by osmosis. Fewer roots are required only for anchorage. They do not have root hairs either.
ii) Prop roots arise from the branches of a tree and descend downwards. They provide anchorage, help in nutrients absorption and serve as a food storage site.
iii) Shoots and leaves of Ginger are edible too.
iv) The basic function of Pneumatophores is respiration.