class iv science roots.

Plant

D1. Name the two different types of roots.

Ans: The two types of roots are tap roots and fibrous root.

D2.Give two examples of plants having fibrous roots.

Ans: Two examples of plants having fibrous roots are banana and marigold (rice, wheat, maize, grass)

D3.Why do aerial roots need to come out of the soil?

Ans: Plant having aerial root generally grow in marshy area, where the soil is arranged very tightly. The soil does not have sufficient oxygen for the roots, so aerial roots need to come out of the soil to get oxygen.

E2.In what way(s) is the tap root different from the fibrous root?

Ans : The difference between tap roots and fibrous roots are

Tap roots	Fibrous root
Tap root grows very deep.	Fibrous root does not grow very deep.
Tap roots are found in diacot plant	Fibrous  roots are found in monocot  plant
Tap root develops from the radical of the seed	Fibrous root originates from the stem tissue
In tap root primary root is very long  where as lateral roots short	In fibrous roots all roots are much similar in size.

E3.State two main functions of roots?

Ans:The two main function of roots are fixation and absorption  of water and minerals.

E4.In what ways are the  roots   of banyan tree and maize are  special.?

Ans: The main root of banyan and maize tree are not strong enough support the tree. The special  prop root which grow from the branches gives extra support to the main plant.