CLASS IV - SCIENCE - CHAPTER 2

 1. What type of climate is found on hills?

Ans: Cold and dry climate is found

on hills. On hilly region temperature is very cold as there snow fall take place frequently and for that we can see so many special characters of the hilly region plant to survive on that particular area.

2. How do conifers save water?

Ans: Conifers have needle like leaves containing wax material coating which help them to avoid water loss.

3. What are mangroves?

Ans: Area which has lots of water and the soil is sticky and clayey is called marshy area.

The trees that grow here are called as mangroves.

Example: Rhizopora , Sundari etc.

4. How does a tree living in desert keep itself cool when it is hot?

Ans: A plant (tree) living in a desert area increases the humidity of its surrounding's air and the water vapour absorb the heat of that area . Thus the temperature decrease and plant keeps itself cool. 

5. Distinguish among the three types of aquatic plants.

Ans: There are three types of aquatic plants. 

These are ..

(1) Submerged plants: The plants that grow completely under water.

Example: Tape grass, Pond weeds.

(2) Partially Submerged plants: Roots of some planta are fixed to the bottom of water bed and stems help the broad leaves and flowers to float on the water surface.

Example: Water lily, Lotus etc .

(3)Floating plants: The plants that float freely on the surface of the water.

Example: Pistia, Duckweed, Water hyacinth etc.