STD-4, DAV BOOKS, CHAPTER 2 - PLANTS, EXERCISE QUESTION AND ANSWERS

A.     FILL IN THE BLANKS.

1.      _________ is the underground part of a plant.

Ans: Root

2.      Roots absorb ______ and _______ for the plant.

Ans: Water and Minerals

3.      Neem and peepal have ______ roots.

Ans: Tap roots

4.      _______ and ______ are edible roots.

Ans: Radish, Carrot, Beetroot (any two)

5.      Mangrove plants have ______ roots.

Ans: Aerial roots

B.      MATCH THE FOLLOWING:

1.      Carrot and beetroot store food in them.                                                                       True

2.      Beans and rose have fibrous roots.                                                                                False

3.      All roots are edible.                                                                                                         False

4.      Roots do not get sufficient oxygen in marshy areas.                                                    True

 

C.      TICK THE CORRECT OPTION.

 

1.      The root of this plant stores food-

(a)   Mango        (b) Apple          (c)  Banana       (d) Carrot

      Ans: Carrot

2.      This plant has a tap root –

(a)   Banana       (b) Grass           (c) Wheat           (d) Rose

      Ans: Rose

3.      These plants have breathing roots –

(a)   Mangrove       (b)  Apple       (c) Neem       (d) Peepal

       Ans: Mangrove

D.     ANSWER THE FOLLOWING QUESTIONS IN BRIEF.

1.      Name the two different types of roots.

Ans: The two different types of roots are, Tap root and Fibrous roots.

2.      Give two examples of plants having fibrous roots.

Ans: Two plants having fibrous roots are, grass and banana.

3.      Why do aerial roots need to come out of the soil?

Ans: Aerial roots need to come out of the soil to get fresh air from the atmosphere.

A.      E ANSWER THE FOLLOWING QUESTIONS.

1.      Draw the shape of the tap root and the fibrous root. 

 

1.      2.  In what way(s) is the tap root different from the fibrous root?

Ans: i) In tap root system, a single root grows downwards into the soil and smaller thin roots arise from it. There is one main root. Plants like, beans, rose, peepal etc. have tap roots.

ii) In Fibrous roots, many roots arise from the base of the stem. There is no main root. Grasses and cereals have fibrous roots.

2.      3.  State the two main functions of roots.

Ans: The two main functions of roots are,

i)   Absorption:- Roots absorb water and minerals from the soil.

ii) Fixation:- Roots fixes the plant in the soil and holds it upright in the soil.

3.      4. In what ways are the roots of banyan tree and maize ‘special’?

Ans: The roots of banyan tree and maize are special, as they,

i)   Provide extra support to the plant.

                ii) Help the plant in breathing.