Water from Oceans

Q.

Aquatic animals use dissolved _________ in water for respiration.

1. salts
2. oxygen
3. nitrogen
4. carbon dioxide

Q. The formation of dew on the grass during early morning is an example of ___________.

1. sublimation
2. sedimentation
3. evaporation
4. condensation

Q.

Why is salt making restricted to the coastal areas

Q. Draw a diagram to show how seawater reaches a lake or pond.

Q.

Tick(√) the correct alternative from the given options for the following statement:

The purest form of natural water is-

1. Sea water

2. River water

3. Rainwater

4. Lake water

Q.

The purest form of natural water is sea water.

1. True
2. False

Q. When does a drought occur?

Q.

Natural water is generally impure. State two kinds of impurities present in natural water.

Q. The aquatic animals can breathe under water due to the presence of dissolved ___________.

1. carbon dioxide
2. nitrogen
3. oxygen
4. none of the above

Q. Which amongst the following options will lead to drought?

1. Water conservation
2. Excessive use of groundwater
3. Soil erosion
4. Heavy rainfall

Q. Observe the figure given below and identify the process.

1. Torrential rain causing floods.
2. Water cycle
3. Soil erosion
4. Rain water harvesting

Q. Explain the causes of drought.

Q. A list of words is given. Use appropriate words to fill up the blanks in the following statement

Q. What do know about the presence of oxygen on earth?

Q. Glass panes usually appear hazy because:

1. water vapour settling on the tiny dust particles.
2. it is the property of transparent substances.
3. they are old.
4. None of these

Q. With increase in height from the earth's surface, air gets warmer.

1. False
2. True

Q. Overusage of water causes its depletion and hence, water scarcity.

1. False
2. True

Q. 97% of total water in our planet is saline water.

1. True
2. False

Q.

Which of these substances is required to keep our bones strong and healthy?

1. Calcium

2. Iodine

3. Water

4. Fats

Q. What causes the formation of salt from sea water?

1. Condensation
2. Evaporation
3. Transpiration
4. Transformation

Q.

Plants use ___________, ______________ and ____________ to prepare food.

1. Oxygen, Starch and Sunlight

2. Water, Oxygen and Fertilizer

3. Carbon dioxide, Sugar and Sunlight

4. Water, Carbon dioxide and Sunlight

Q.

The amount of usable water on earth is limited.

1. True
2. False