NCERT Solutions Class 7 Science Chapter 7 Weather Climate and Adaptations of Animals to Climate

NCERT Solutions for Class 7 Science for chapter 7 Weather Climate and Adaptations of Animals to Climate

Question - 1 Name the elements that determine the weather of a place.

Answer. 1 Some important elements that determine the weather of a place are as follows:

1. Temperature
2. Rainfall
3. Humidity
4. Wind-speed

Question - 2 When are the maximum and minimum temperatures likely to occur during the day?

Answer. 2 The maximum temperature of a day is likely to occur in the afternoon while minimum temperature of a day is likely to occur 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) Climate

(ii) Dry, hot

(iii) Tropical region, 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: cold and moderately wet

(b) Kerala: hot and humid

(c) Rajasthan: hot and dry

(d) North-east India: cold and wet

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

Answer. 5 Weather of a place changes on a day to day basis while climate remains unchanged for years. Thus, we can say that weather changes frequently and not the climate.

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

The given characteristics can be classified as follows:

Each of the given characteristics is an adaption for a particular type of region. Therefore, none of the characteristics can be considered as an adaptation for both tropical rainforests and polar regions.

Question - 7 The tropical rainforest has a large population of animals. Explain why it is so.

Answer.7 Tropical rainforests have large population of animals because these areas have high temperature and plenty of rainfall throughout the year. Such continuous hot and humid conditions provide these areas with rich nutrient resources to support large variety and population of plants and animals.

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

Answer.8 Animals of certain kind are found living in a particular set of climatic conditions because they are well-adapted to survive and flourish in them. For instance, polar bear is found only in polar regions as it is best adapted to cold climatic conditions. Its characteristics like, thick white fur, fat layer beneath the skin, large wide paws for walking on snow and swimming are all adaptations for the cold climate. On the other hand, monkeys have characteristics like limbs to climb on trees, long tails, feeding on fruits, sharp hearing sense and eyesight that make them suitable to live in hot and humid climatic conditions like those of tropical rainforests.

Question - 9 How do elephant living in the tropical rainforest adapt itself?

Answer. 9 : The elephant possess following characteristics which adapt it to survive in the tropical rainforest.

1. Sharp sense of smell
2. Strong teeth and tusk to obtain food and feed on variety of foods
3. Large pinna to hear even faintest of sounds and for fanning to keep cool under hot conditions
4. Loud voice for making warning calls
5. Large and strong trunk to protect as well as in pick up food

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 and heavy rainfall

(iii) cold and humid

(iv) hot and dry

Answer. 12 (i) hot and humid