SOLUTIONS OF WORKSHEET 2 , CH 7, CLASS 7

 1. Adaptation is the term used to describe such ability. Animals are adapted to survive in the conditions in which they live. So, fish dies when taken out of water while wall lizard dies if kept under water.

2. The major factor which determines the climate of a place is latitude.

3. Those animals that can live both in water and on land are called amphibian, e.g. frog.

4. Daily weather reports carry information about the temperature, humidity and rainfall during the past 24 hrs

5. The scientist who prepares the weather reports are called meteorologist and the science is called meteorology.

6. The sun is the primary source of energy that causes change in the weather.

7. Sun provides light as well as heat on the earth.

8. Penguin, polar bear, whale, seal and musk oxen live in polar region.

9. Weather is a complex phenomenon which can vary over a short period of time and thus it is difficult to predict the weather of a place while it is easier to predict climate as it is the average weather pattern taken for a long time.

10. Adaptive features of penguin that help it in swimming are as follows

• It has streamlined body.
• It has webbed feet.

11. This property of animal to blend with its surrounding is called camouflage.

12. Polar bear have white fur. This is an adaptation of polar bear to blend it with the white background of ice or snow. This helps them to protect from their predators and also to catch their prey.

13. The factors that affect the climate of a place are

• Temperature zone or latitude, i.e. amount of sunshine it receives or distance from equator.
• Distance from sea.
• Altitude or height above the sea level.
• Humidity or the presence of moisture in air.
• Amount of precipitation received or rainfall.

14. Migration is the seasonal journey taken by different animals or birds to escape the extreme climatic condition and the search of food, e.g. Siberian cranes migrates towards warmer region in the autumn by travelling several thousands of kilometers.

Some birds are guided by the sun during daytime and by stars during night. Some birds can use the magnetic field of the earth to fnd the direction. Besides birds some fishes, insects and mammals also migrate seasonally in search of more hospitable climates

15. 

Weather	Climate
It is a day to day condition of atmosphere at a place.	It is the average weather pattern taken over a long period of time (say 25 years).
It varies over a very short period of time (like hour to hour).	It does not vary in a short period of time.
It cannot affect the adaptation of an organism.	Climate affects the adaptions of an organism.

16. Adaptive features of a polar bear that help in keeping it warm are as follows

• They have two thick layers of white fur.
• They have layer of fat under their skin.

17. (a) Animal X with yellow brown colour skin is lion and animals Y with yellow brown colour with black strips on skin is tiger.

(b) These animals are also called as big cats.
(c) These animals live in tropical rainforest.
(d) These animals are carnivores.

18. (a) The bird shown in figure is penguin.
(b) Penguins are huddling together to keep them warm.
(c) These birds are found in polar regions.

19. (d)

20. (a) Rohan observed a camel in the desert of Rajasthan.
(b) The hump stores fat which provides camel with food in times of food shortage.
(c) The feets of camel has large soles which help it to walk on soft sond,
(d) Camel can drink a very large quantity of water at a time which is stored in its stomach. It sweats very little which helps it to conserve water. Also it excretes very little water in the form of urine.
(e) Rohan is observant, curious and adventurer. He asks intelligent questions.