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CBSE 11th Standard Biology Subject Morphology of Flowering Plants Ncert Exemplar 2 Marks Questions 2021

Published on: 27/05/2021

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Std: 11th Standard CBSE - Biology

chapter: - NCERT Exemplers

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Questions:

Generic 2

4 x 2 = 8

Differentiate between pedical and peduncle.

Reticulate venation is found in dicot leaves, while in monocot levaes venation is of parallel type. Biology being a science of exceptions, find out any exception to this generalisation.

Tendrils of grapevine are homologous to tensrils of pumpkin, but analogous to those of pea.Justify the above statement

In Opuntia the stem is modified into a flattened green structure to perform the function of leaves. Write some other examples of modification of plant parts for the purpose of photosynthesis.

Generic 3

1 x 3 = 3

You have heard about several insectivorous plant that feed on insects. Nepenthes or the pitcher plant is one such example which usually grows in shallow water or in marsh lands. What part of the plant is modified into a 'pitcher'. How does this modification help the plant for food even though it can photosynthesisie like any other green plant?

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Answers Key:

Generic 2

4 x 2 = 8

Differentiate between pedical and peduncle are

Pedicel	Peduncle
It is a stalk of the flower	It is the axis of inflorescence.
Pedicel bears a single flower.	It generally bears a number of flowers

Dicot leaves have parallel venation e.g. Corymbium,Calophyllum,Eryngium Monocot leaves have reticulate venation e.g Smilax,Colocasia,Dioscorea.

Tendrils of grapevine and pumpkin are stem structures while those of pea are foilar in nature. Hence, the tendrils of grapevine and pea are analogous structures.

(i) Photosynthesis roots.e.g, Trapa, Tinospora
(ii) Phyllode (flattened petiole).e.g., Acacia longifolia
(iii) Foliaceous Stipules e.g Lathyrus aphace

Generic 3

1 x 3 = 3

In insectivorous plant e.g., Nepenthes, the leaf lamina gets modified in the form of pitcher and anterior part of petiole coils like tendril which keeps the pitcher in a vertical direction. Posterior part of the petiole remains flattened like a leaf. The apex of lamina forms a lid. Pitcher contains digestive enzyme which the trapped insects .
All these modifications and adaptation are developed to make up the nitrogen deficiency in the plant because these plants are found in N2 deficient soil, (marshy/swamp soils)