class iv science lesson 2 que-ans

  CLASS – 4   SCIENCE  EXERCISE LESSON-2

D SECTION QUESTION AND ANSWER

Que 1 – Name the two different types of roots.

Ans 1- Roots are of two types:

(a) Tap roots

(b) Fibrous roots

Que 2 – Give two examples of plants having fibrous roots. Ans 2- Fibrous roots are found in all cereals, grasses and banana.

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

Ans 3-  In marshy area, some breathing roots of plants come out from the soil to get fresh air from the atmosphere. Ex- mangrove plants

E – SECTION QUESTION AND ANSWER

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

Ans 1-

Que2 – In what ways, is the tap root different from the fibrous root?

Ans2-(a) Tap root is a single, long root with thin roots arising from it. Plants, like beans, rose, lady finger, neem and peepal, have tap roots.

(b)Fibrous roots are those in which many roots arise from the base of the stem. A fibrous root tends to taper downwards.

Que 3 – State the two main functions of roots.

Ans 3- Absorption and fixation are the two main functions of roots.

Que 4 – In what way are the roots of banyan tree and maize ‘special’?

Ans 4- The branches of a banyan tree get extra support with the help of special roots that grow downwards from the branches.

Similarly, some plants, like maize, have thin and long stems which require extra support to keep them erect. Ex- Maize etc.

VALUE BASED QUESTION

Que-1   What does the above situation tell us about Rohan?

Ans-1   Conscious toward nature.

Que-2   How did he help the watchman?

Ans-2   He give a blanket to the watchman to keep warm himself.

Que-3   Rohan, stopped the watchman from cutting trees. Have you ever done anything similar to save your environment?

Ans-3   Yes, I always throw waste in dustbin and suggest to others also.