NCERT Class 11-Biology: Chapter – 5 Morphology of Flowering Plants Part 2 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 9:

Which of the following plants is used to extract the blue dye?

a. Trifolium

b. Indigofera

c. Lupin

d. Cassia

Answer: (b)

Question 10:

Match the following and choose the correct option:

Question 10 Table of Choose the Correct Option
Group AGroup B
(A)Aleurone layeri.without fertilization
(B)Parthenocarpic fruitii.Nutrition
(C)Ovuleiii.Double fertilization
(D)Endospermiv.Seed

Options

a. A-i, B-ii, C-iii, D-iv

b. A-ii, B-i, C-iv, D-iii

c. A-iv, B-ii, C-i, D-iii

d. A-ii, B-iv, C-i, D-iii

Answer: (b)

Very Short Answer Type Questions

Question 1:

Roots obtain oxygen from air in the soil for respiration. In the absence or deficiency of , root growth is restricted or completely stopped. How do the plants growing in marshlands or swamps obtain their required for root respiration?

Answer:

In some plants such as Rhizophora and Sonneratia (mangrove plant) growing in swampy areas near river mouths (saline marshy soil or halophytes) , many roots come out of the ground and grow vertically upwards (negatively geotropic: against gravitational force) . Such roots, called pneumatophores or breathing roots or respiratory roots, help to get oxygen for respiration.

Question 2:

Write floral formula for a flower which, is bisexual; actinomorphic; sepals five, twisted aestivation, petals five; valvate aestivation; stamens six; ovary tricarpellary, syncarpous, superior, trilocular with axile placentation.

Answer:

The floral formula of the described flower is represented as:

Actinomorphic flowers are represented by the symbol

A bisexual flower is indicated by .

The calyx contains five united sepals which can be represented as

The corolla consists of five free petals and it represented as .

Question 3:

In Opuntia the stem is modified into a flattened green structure to perform the function of leaves (i.e.. , photosynthesis) . Cite some other examples of modifications of plant parts for the purpose of photosynthesis.

Answer:

Stem of Euphorbia is a fleshy and cylindrical structure. The stem in this plant carries out photosynthesis because of the presence of chlorophyll.

Question 4:

In swampy areas like the Sunderbans in West Bengal, plants bear special kind of roots called ________.

Answer:

Pneumatophores

Question 5:

In aquatic plants like Pistia and Eichhornia, leaves and roots are found near ________.

Answer:

The surface of water.

Question 6:

Reticulate and parallel venation are characteristic of ________ and ________ respectively.

Answer:

Monocot, Dicot

Question 7:

Which parts in ginger and onion are edible?

Answer:

Underground stem in ginger is edible. Modified leaves are edible in onion

Question 8:

In epigynous flower, ovary is situated below the ________.

Answer:

Thalamus

Question 9:

Add the missing floral organs of the given floral formula of Fabaceae. ________

Answer: