STD-4, CHAPTER-2: PLANTS, EXTRA QUESTION ANSWERS

 1.      Name the different parts of the plant.

Ans: The different parts of the plant are, leaf, fruit, bud, flower, stem and root.

2.      _______ fixes a plant in the soil.

Ans: Root

3.      _____ supports a plant and keeps it upright.

Ans: Stem

4.      Leaf has _____ in it to prepare food and to give it its green colour.

Ans: Chlorophyll

5.      Fruits have ______ in them which germinate to form plants.

Ans: seeds

6.      Name the underground part of the plant.

Ans: Root is underground part of the plant.

7.      What happens to the roots when the plant grows?

Ans: As the plant grows, its roots become thick and woody with a corky outer layer.

8.      Name the two types of root.

Ans: Roots are of two types, i) Tap roots

                                                   ii) Fibrous roots

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

Ans: i) Tap root is a single, long root with thin roots arising from it.

ii) Fibrous roots are those in which many roots arise from the base of the stem.

10.  Name some plants which have tap root.

Ans: Some plants which have tap root are, beans, rose, lady finger, neem and peepal.

11.  Name some plants having fibrous roots.

Ans: Some plants having fibrous roots are, cereals, grasses and banana.

12.  How do plants help in soil conservation?

Ans: Roots bind the soil and protect it from getting washed away. Thus, roots help in soil conservation.

13.  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 – It holds the plant upright in the soil.

14.  Name the substances that are absorbed by the roots.

Ans: Water and minerals are absorbed by the roots.

15.  What are edible roots?

Ans: Those roots which store food for the plant, are called edible roots.

16.  Name some edible roots.

Ans: Some edible roots are, carrot, radish, beetroot.

17.  In what way are the roots of banyan tree and maize ‘special’?

Ans: i) In case of banyan tree, roots grow downwards from the branches. They provide extra support to the banyan tree.

ii) In maize plants also, roots arise from the base of their stem and support the plant.

Thus, roots of banyan tree and maize perform special functions. So, they are special.

18.  Where do mangrove plants appear?

Ans: Mangrove plants are found in marshy areas.

19.  Define atmosphere.

Ans: The air surrounding the earth, makes the atmosphere.

20.  What are aerial roots?

Ans: Those roots which perform the special function of breathing, are called aerial roots. They come out of the soil to get oxygen.

21.  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.

22.  Name some plants having aerial roots.

Ans: Banyan, maize and mangrove plants, have aerial roots.

23.  What should be kept in mind, before cutting trees?

Ans: A written permission from the appropriate authorities is required before cutting trees.