1. Fill in the blanks:

1. ________ refers to the amount of water in the air.

2. The ________ is an imaginary circle around the middle of earth.

3. Atmosphere can hold only a fixed amount of ________.

4. _______ of water float together in the air as clouds.

Answer

1. Humidity

2. Equator

3. Water vapour

4. Tiny droplets

2. Match the following.

1. Humid                          a. South Pole

2. Dew                              b. North Pole

3. Arctic region                c. Warm and damp

4. Antarctic region           d. The tiny drops of water

Answer

1. c  2. d  3. b  4. a

3. State whether true or false.

1. A thick cloud of very small drops of water in the air close to the land or sea is called dew.

2. The raindrops pass through a very cold layer of air, they freeze into little balls of ice called hailstones.

3. The process by which water vapour changes into water is called condensation.

4. Evaporation refers to the amount of water in the air.

Answer

1. False

2. True

3. True

4. False

4. What is the difference between evaporation and condensation?

Evaporation : The process by which water changes into water vapour is called evaporation.

Condensation : The process by which water vapour changes into water is called condensation.

5. How does rainfall occur?

Tiny droplets of water float together in the air as clouds. When many of them join together and become heavy, they fall as rain.

6. What is meant by hailstone?

When raindrops pass through a very cold layer of air, they freeze into little balls of ice called hailstones.

7. Define fog and dew.

Fog: A thick cloud of very small drops of water in the air close to the land or sea.

Dew: The tiny drops of water that from on leaves, grass and other cold things during the night.

8. Distinguish between humid and humidity.

Humid: Humid means warm and damp.

Humidity: Humidity refers to the amount of water in the air.

9. What is meant by equator?

The equator is an imaginary circle around the middle of earth. Places near the equator get a lot of sunshine through out the year. The rays of sun fall directly in  places near the equator. So these places are hot.

10. Give instances to show that climate affects our life in many ways.

Climate usually affects our lifestyle in many ways. It determines the kind of house we live in, the kind of clothes we wear, the kind of food we eat etc. Houses with standing roofs are built in places where it snows or rains heavily. People who live in cold regions wear heavy, woollen clothes and take food that keeps their body warm. People who live in warm regions wear light, loose, cotton clothes and take food that keep their body cool.

11. Differentiate Arctic region and Antarctic region.

The area around the North Pole is called the Arctic region. The area around the South Pole is called the Antarctic region.

12. What causes storm?

When wind blows gently, we call it a breeze. When it blows fast, there is a storm.

13. What is weather?

Weather indicates how hot, cold, windy, cloudy, rainy or humid a day is. The weather of a place on a day is the condition of the air around the place on that day.

14. Climate determines the kind of plants that grow naturally in a place. Give examples.

Forests of pine and fir trees grow in cold places. Palm trees grow only in warm places.

15. Give two examples to show that the kind or crops people grow depends on the climate of a place.

In warm, rainy regions, farmers grow rice because rice grows well in such places. Apples are grown in cold regions.

16. How do season and weather affect our lives? Give example.

The Kind of clothes we wear and the food we eat depend on the season. For example, we get mangoes only in summer. Even day to day changes in weather affect our lives. No one plans a picnic on a rainy day. Fishermen do not go out to sea when there is a storm.

17. The height of a place affects climate. Give examples.

The climate of a place depends on whether it is a hill or a plain. As the height increases, climate grows colder. Mountains have a cold climate.

18. On some days, the sweat on our skin does not evaporate quickly and clothes take too long to dry. Why?

Atmosphere can hold only a fixed amount of water vapour. When it is already full of water vapour, it cannot take any more.This is the reason why sweat does not evaporate and clothes take too long to dry on some days.