Saturday, 16 April 2016

TEXTBOOK ANSWERS AND SOLUTIONS OF CBSE CLASS VII SCIENCE Chapter 7 Weather Climate And Adaptations Of Animals To Climate

1) Name the elements that determine the weather of a place.

ANSWER:- The temperature, humidity, rainfall, wind- speed, etc. are called the elements that determine the weather of a place.

2) When are the maximum and minimum temperature likely to occur during the day?

ANSWER:-The maximum temperature of the day occurs in the afternoon while the minimum temperature occurs early in the morning.

3) Fill in the blanks:
(i) The average weather taken over a long time is called climate.
(ii) A place receives very little rainfall and the temperature is high throughout the year, the climate of that place will be hot and dry.
(iii) The two regions of the earth with extreme climatic conditions are the polar region and the tropical region.

4) Indicate the type of climate of the following areas:

(a) Jammu and Kashmir: Moderately hot and wet
(b) Kerala: Hot and wet
(c) Rajasthan: Hot and dry
(d) North-east India: Wet

5) Which of the two changes frequently, weather or climate?

ANSWER:-Weather changes frequently.

6) Following are some of the characteristics of animals:
(i) Diets heavy on fruits (ii) White fur (iii) Need to migrate (iv) Loud voice(v) Sticky pads on feet (vi) Layer of fat under skin (vii) Wide and large paws (viii) Bright colours (ix) Strong tails (x) Long and large beak .For each characteristic indicate whether it is adaptation for tropical rainforests or Polar Regions. Do you think that some of these characteristics can be adapted for both regions?

(i) Diets heavy on fruits Tropical rainforests
(ii) White fur Polar Regions
(iii) Need to migrate Polar Regions
(iv) Loud voice Tropical rainforests
(v) Sticky pads on feet Tropical rainforests
(vi) Layer of fat under skin Polar regions
(vii) Wide and large paws Polar Regions
(viii) Bright colours Tropical rainforests
(ix) Strong tails Tropical rainforests
(x) Long and large beak Tropical rainforests
No, none of the above characteristics can be adapted for both regions.

7) The tropical rainforests has a large population of animals. Explain why it is so.

ANSWER:-The climate of tropical rainforests is generally hot and humid with continuous rain.
These hospitable climatic conditions support huge populations of plants and animals

8) Explain, with examples, why we find animals of certain kind living in particular climatic conditions.

ANSWER: - Animals are adapted to survive in the conditions in which they live. Features and habits which help them to adapt to their surroundings are the result of evolution. So, to survive in a particular type of climate the animals must have certain adapted features

9) How do elephants living in the tropical rainforests adapt themselves?

ANSWER:-An important and widely found animal of Indian tropical rainforests is the elephant. It has adapted remarkably to the conditions of this region. Some of the adaptations are as follows.

(i) It uses its trunk as nose so that it has a strong sense of smell.
(ii) Its trunk is also used for picking up food.
(iii) Its tusks are used to tear bark of trees. It can eat barks of trees.
(iv) The soles of their feet are covered with thick pads. These pads can handle their enormous weight. They also prevent sound so that the elephants can move silently.
(v) Its large ears have strong sense of hearing.

10) Choose the correct option which answers the following question: A carnivore with stripes on its body moves very fast while catching its prey. It is likely to be found in
(i) Polar regions
(ii) Deserts
(iii) Oceans
(iv) Tropical rainforests

ANSWER :-(iv) tropical rainforests

11) Which features adapt polar bears to live in extremely cold climate?
(i) A white fur, fat below skin, keen sense of smell.
(ii) Thin skin, large eyes, a white fur.
(iii) A long tail, strong claws, white large paws.
(iv) White body, paws for swimming, gills for respiration.

ANSWER:-A white fur, fat below skin, keen sense of smell

12)Which option best describes a tropical region?
(i) hot and humid
(ii) moderate temperature, heavy rainfall
(iii) cold and humid
(iv) hot and dry

ANSWER:-Hot and humid