Chapter 7, Weather, Climate and Adaptations of Animals to Climate |
Class 7 | Science | NCERT Solutions
Question 1. Name the elements that determine the weather of a place.
Answer 1 The elements that determine the weather of a place are temperature, humidity , rainfall, pressure, wind speed.
Question 2. When are the maximum and minimum temperatures likely to occur during the day?
Answer 2 The maximum temperature of the day occurs generally in the afternoon while the minimum temperature occurs generally in the early morning.
Question 3. Fill in the blanks:
(i) The average weather taken over a long time is called ___________.
(ii) A place receives very little rainfall and the temperature is high throughout the year, the climate of that place will be ___________ and ___________ .
(iii) The two regions of the earth with extreme climatic conditions are ___________ and __________.
Answer 3 (i) The average weather taken over a long time is called climate of the place.
(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 tropical region and polar region
Question 4. Indicate the type of climate of the following areas:
(a) Jammu and Kashmir: _________________________________
(b) Kerala: ____________________________________________
(c) Rajasthan: __________________________________________
(d) North-east India: _____________________________________
Answer 4 (a) Jammu and Kashmir: moderately hot and wet climate for a part of the year, extremely cold in winter.
(b) Kerala: very hot and wet as it is a coastal area.
(c) Rajasthan: hot and dry because the temperature is high during most part of the year. But during winter, which lasts only for a few months, the temperature is quite low. This region receives very little rainfall.
(d) North-east India: wet because the northeastern India receives rain for a major part of the year.
Question 5. Which of the two changes frequently, weather or climate?
Answer 5 Weather changes frequently.
Question 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?
Answer 6 Polar Regions
(ii) White fur,
(iii) Need to migrate,
(vi) Layer of fat under skin,
(vii) Wide and large paws.
(i) Diets heavy on fruits,
(iv) Loud voice,
(v) Sticky pads on feet,
(viii) Bright colours,
(x) Long and large beak.
Question 7. The tropical rainforest has a large population of animals. Explain why it is so.
Answer 7 The tropical rainforest has a large population of animals because of continuous warmth and rain.
Question 8. Explain, with examples, why we find animals of certain kind living in particular climatic conditions.
Answer 8 Animals are adapted to survive in the conditions in which they live.Features and habits help them to adapt to their surrounding. These adaptations are because of long process of evolution. It would be difficult for them to survive if they are moved to region having different climate conditions than from their habitat.That is why we find animals of certain kind living in particular climatic conditions.
For Ex: A polar bear has thick layer of fat under their skin which acts heat insulator. It protects the bear from extreme cold climate of polar region. The polar bear cannot survive if it is moved to hot and dry desert region.
Question 9. How do elephant living in the tropical rainforest adapt itself?
Answer 9 The elephants living in the tropical rainforest adapt itself in following ways:
1) It uses its trunk as a nose because of which it has a strong sense of smell and is also used for picking up food.
2) Its tusks are modified teeth.. These can tear the bark of trees that elephant loves to eat.
3) Large ears of the elephant help it to hear even very soft sounds. They also help the elephant to keep cool in the hot and humid climate of the rainforest.
Choose the correct option which answers the following question:
Question 10. 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 10 (iv) tropical rainforests
Question 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 11 (i) A white fur, fat below skin, keen sense of smell.
Question 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 12 (i) hot and humid