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Morphology Of Flowering Plants

Question
CBSEENBI11002290
Wired Faculty App

Leaves become modified into spines in

  • Opuntia

  • pea

  • onion

  • silk cotton

Solution

A.

Opuntia

Leaves are modified into spines in Opuntia (xerophytes) so as to reduce the surface area and minimize rate of water loss by evaporation and transpiration. Besides, they also provide protection to the plant from grazing animals. 
In pea, the leaves are modified into tendrils to help them in climbing around support, in onion leaves are modified to fleshy succulent to store food. 

Some More Questions From Morphology of Flowering Plants Chapter

What is meant by modification of root? What type of modification of root is found in the:
(a) Banyan tree
(b) Turnip
(c) Mangrove trees

Justify the following statements on the basis of external features:
(i) Underground parts of a plant are not always roots.
(ii) Flower is a modified shoot.

How is a pinnately compound leaf different from a palmately compound leaf?

Explain with suitable examples the different types of phyllotaxy.

Define the following terms:

(a) aestivation

Define the following terms:

(c) placentation

Define the following terms:

(c) actinomorphic

Define the following terms:

(d) zygomorphic

Define the following terms:
(e) superior ovary

Define the following terms:
perigynous flower

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