NCERT Solution class 7 Science Chapter-7

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NCERT Solution class 7 Science Chapter-7

Chapter – 7   Weather, Climate and Adaptation of Animals to Climate

 

Chapter Exercise

Page no. – (77)

 

Q.1– Name the elements that determine the weather of a place.

Ans.1– Temperature, wind, rainfall and humidity are the element that determine the weather of a place.

 

Q.2– When are the maximum and minimum temperatures likely to occur during the day?

Ans.2– Generally Maximum Temperature of the day occurs in the afternoon and whereas minimum temperature of a day occurs in early morning.

 

Q.3– Fill in the blanks:-

  1. The average weather taken over a long time is called Climate of the Place­­_    .
  2. A place receive very little rainfall and the temperature is high throughout the year, the climate of that place will be __hot__ and ­­__dry
  • The two regions of the earth with extreme climate conditions are ­­__polar__ and __tropical Condition

Q.4–   Indicate the type of climate of the following areas:-

  1. Jammu and Kashmir:- ____________
  2. Kerala:- ____________
  3. Rajasthan:- _____________
  4. North – east India:- ___________

 

Ans.4–

  1. Jammu and Kashmir:- __Moderate hot and wet.
  2. Kerala:- ­­__Hot and wet­­__.
  3. Rajasthan:- ­­__Hot and dry__.
  4. North – east India:- __Wet­­__.

 

Q.5– Which of the two changes frequently, weather or climate?

Ans.5– Weather change frequently but not climate.

 

Q.6:- Following are some of the characteristics of animals:-

  1. Diets heavy on fruits ii. White fur

iii. Need to Migrate         iv. Loud voice

  1. Sticky pads on feet vi. Layer of fat under skin

vii. Wide and large paws viii. Bright colours

  1. 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?

Ans.6–

  1. Diets heavy on fruits – Tropical rainforest.
  2. White fur – Polar region.
  • Need to Migrate – Polar region.
  1. Loud voice – Tropical rainforest.
  2. Sticky pads on feet – Tropical rainforest.
  3. Layer of fat under skin – Polar region.
  • Wide and large paws – Polar region
  • Bright Colours – Tropical rainforest.
  1. Strong tails – Tropical rainforest.
  2. Long and large beak – Tropical rainforest.

 

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

Ans.7– The tropical rainforest has a large population of animals because of continuous warmth and rain, the tropical region supports an enormous number and a wide variety of animals and creatures.

 

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

Ans.8:- In the tropical rainforest days and night are almost same about in length. These regions has plenty of rainfall. The temperature of these region are between 15C to 40C in a years. Because of continue Rain and warmth, this region support much variety of creature, animals and plants. And the climate conditions in rainforest are suitable to support much verity of animal and plants. That’s why much number of plants and animals living in rainforest.

 

Q.9– How do elephants living in the tropical rainforests adapt themselves?

Ans.9– The following reasons are:-

  • It has modified teeth tear the bark of trees which are food for elephants.
  • The trunk is also used to pick food.
  • Large ears of the elephant help it to hear even very soft sounds.
  • It also uses the trunk as nose to have strong sense of smell.

 

Q.10– A carnivore with stripes on its body moves very fast while catching its prey. It is likely to be found in

  1. Polar Regions
  2. Deserts
  • Oceans
  1. Tropical rainforests

 

Ans.10– iv. Tropical rainforest.

 

Q.11– Which features adapt polar bears to live in extremely cold climate?

  1. A white fur, fat below skin, keen sense of smell.
  2. Thin skin, large eyes, a white fur.
  • A long tail, strong claws, white large paws.
  1. White body, paws for swimming, gills for respiration.

Ans.11–

  1. A white fur, fat below skin, keen sense of smell.

 

Q.12– Which option best describes a tropical region?

  1. Hot and humid
  2. Moderate temperature, heavy rainfall
  • Cold and humid
  1. Hot and dry

Ans.12–

  1. Hot and Humid.