CBSE Class 7 Science Weather Climate and Adaptations of Animals to Climate VBQs

Choose The Correct Answer.

Question.Coldest desert in India is:
a) Arabian desert
b) Sahara desert
c) Thar desert
d) Ladakh
Answer : D

Question.Weather of a place is affected by:
a) Wind
b) Temperature
c) Humidity
d) All of these
Answer : D

Question.Climate of coastal areas is:
a) Hot and dry
b) Moderate
c) Cold and dry
d) Extreme cold
Answer : B

Question.Arctic region lies at:
a) 23º N
b) 23º S
c) 0º
d) 85º N to 90º N
Answer : D

Fill In The Blanks.

(i) Weather of a place may change during a day.

(ii) The areas of earth near North Pole and South Pole are called Polar Regions.

(iii) The amount of water vapours present in air is called humidity.

(iv) Antarctica is the coldest desert on Earth.

(v) Indian hot desert or Thar desert spread over states of Rajasthan and Gujarat.

State True Or False.

Question.Whale is the largest animal. (True)
Answer : True

Question.Reindeer is the main animal of tropical forest. (False)
Answer : False

Question.Camel stores fat in its hump which is consumed during the days it does not get food. (True)
Answer : True

Question.Weather and climate both terms have same meaning. (False)
Answer : False

Match The Column ‘A’ With Column ‘B’.

Answer : (i) - (c), (ii) - (d), (iii) - (e), (iv) - (b), (v) - (a), 

ACTIVITY-  Collect weather data of your city or nearby city for one week.

Question. Which instrument is used for measuring rainfall?
Answer : Rain gauge.

Question. Name the instrument used to measure relative humidity.
Answer : Dry or wet bulb thermometer or hygrometer.

Question. Name the source you used to collect weather reports.
Answer : We can collect data from newspaper and weather observatory for weather reports.

Very Short Answer Type Questions.

Question.What is and dune?
Answer : A sand dune is a landform composed of wind driven dry sand in the form of a mould or ridge.

Question.Name any two factors that affect the weather of a place.
Answer : Humidity and temperature.

Question.What is a polar region?
Answer : The areas around the Poles (north and south) in 5º latitude is known as polar region.

Question.Define climate.
Answer : The average conditions of humidity, rainfall, snowfall and temperature of a place over a span of 25-30 years is called climate.

Short Answer Type Questions.

Question.Write two effects of climate change.
Answer : (1) Due to climate change green house effect is increasing which causes global warming.
(2) Many glaciers are melting which is threat to polar life and coastal cities.

Question.Write three adaptations found in aquatic animals.
Answer : (1) Streamlined body helps them in swimming.
(2) Presence of gills to take oxygen from water.
(3) Presence of fins help in swimming.

Question.How does sea breeze occur?
Answer : During the day time land becomes hotter than water. The air near the land rises up as it is hot and light. So cold air over the sea moves towards land, this is known as sea breeze.

Question.What is green house effect?
Answer : Gases in air, like carbon dioxide absorb heat from sunlight to increase temperature of atmosphere.
This effect is known as green house effect.

Long Answer Type Questions.

Question.Name various factors that affect the climate of a place. Explain any two of them.
Answer : Climate is affected by following factors:
(1) Distance from sea, (2) Altitude, (3) Latitude and (4) Direction of mountains. 
Altitude- Altitude refers height from the sea level. Temperature is higher near the surface of earth and decreases as we go upward.
Latitude- Latitude refers to distance from the equator. The climate near equator is hot and humid throughout the year. With the increase in latitude, the climate keeps on getting colder.

Question.How is camel adapted to survive in hot desert? Explain.
Answer : Camel has following adaptations to survive in deserts:
(1) Its colour is brown like sand dunes.
(2) Its feet are flat and spongy to walk on sand.
(3) Its nose is covered with nasal flaps so that sand may not enter nose.
(4) It drinks a lot of water when available. This water spreads in the body tissue. This helps camel to survive without water for many days.
(5) It store fat in the hump. This fat is consumed when food is not available.
(6) It excretes very little water.
(7) Its legs are long to leap high above hot sand.

Question.Write various adaptations found in polar beer.
Answer : Polar beer has following adaptations:
(1) Its fur is white to disguise in snow covered areas.
(2) Long fur saves it from extreme cold of surroundings.
(3) A layer of fats deposited under the skin helps it keep warm.
(4) Its feet are designed to run on snow.