NCERT Class 11-Biology: Chapter –5 Morphology of Flowering Plants Part 3

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Question 10:

Name the body part modified for food storage in the following

a. Carrot __________________________

b. Colocasia __________________________

c. Sweet potato __________________________

d. Asparagus __________________________

e. Radish __________________________

f. Potato __________________________

g. Dahlia __________________________

h. Turmeric __________________________

i. Gladiolus __________________________

j. Ginger __________________________

k. Portulaca __________________________

Answer:

(a) Tap Root

(b) Stem

(c) Adventitious Roots

(d) Root

(e) Tap Root

(f) Stem

(g) Adventitious Roots

(h) Stem

(i) Stem

(j) Stem

(k) Adventitious Roots

Short Answer Type Questions

Question 1:

Give two examples of roots that develop from different parts of the angiospermic plant other than the radicle.

Answer:

In some plants, roots arise from parts of the plant other than the radicle. Such roots are called adventitious roots.

Banyan tree – roots develop from the lower nodes of the stem. They are prop roots which grow downwards and touch the soil. They meant for the support.

Sugarcane – roots arise from the lower nodes of stem and enter the soil. They are stilt roots which are meant to provide strength to the plant.

Question 2:

The essential functions of roots are anchorage and absorption of water and minerals in the terrestrial plant. What functions are associated with the roots of aquatic plants? How are roots of aquatic plants and terrestrial plants different?

Answer:

Functions of roots in aquatic plants are

(i) Buoyancy in floating plants,

(ii) Anchorage in submerged fixed plants.

Differences in Roots of Aquatic and Terrestrial Plants are

Functions of Roots in Aquatic Plants
Functions of roots in aquatic plants

Roots of Aquatic Plants

Roots of Terrestrial Plants

Poorly Developed

Profusely Developed

Root hair absent

Root hair Present

Xylem atrophied (Poorly developed)

Xylem well developed

Aerenchyma Occurs

Aerenchyma is Absent

Question 3:

Draw diagrams of a typical monocot and dicot leaves to show their venation pattern.

Answer:

The arrangement of veins and the veinlets in the lamina of leaf is termed as venation.

When the veinlets form a network, the venation is termed as reticulate.

When the veins run parallel to each other within a lamina, the venation is termed as parallel.

Leaves of dicotyledonous plants generally possess reticulate venation, while parallel venation is the characteristic of most monocotyledons.

Monocot and Dicot Leaves

Monocot and Dicot Leaves

In the above picture, the first leaf shows parallel venation which is shown by leaves in monocots like maize, grass etc. and the second leaf has reticulate venation which is shown by leaves in dicots like pea, gram, etc.

Question 4:

A typical angiosperm flower consists of four floral parts. Give the names of the floral parts and their arrangements sequentially.

Answer:

A typical angiosperm flower consists of 4 floral parts namely – calyx, corolla, androecium, gynoecium.

Calyx – It is the outermost whorl of the flower and the members are called sepals which are green, leaf like and protect the flower in the bud stage.

Corolla – It is composed of petals. Petals are usually brightly coloured to attract insects for pollination.

Androecium – It is composed of stamens. Each stamen which represents the male reproductive organ consists of a stalk or a filament and an anther.

Gynoecium – It is the female reproductive part of the flower and is made up of one or more carpels. A carpel consists of three parts namely stigma, style and ovary.

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