Give geographical resons.

Question 13 Marks

Regions, where warm and cold currents converge, are favourable for the growth of fisheries.

Answer

Regions, where warm and cold currents converge, are favourable for the growth of planktons.
Planktons are the food for fishes.
Fishes travel here in large numbers.
They breed in warm waters and increase the number of fishes.
Therefore, regions where warm and cold currents converge favour the growth of fisheries.

Question 23 Marks

Greenhouse gases lead to increasing temperature of the earth.

Answer

Some gases in the atmosphere like carbon dioxide and water vapour can hold the heat within themselves for a long period of time.
Due to the gases, the temperature of air in the atmosphere increases.
Thus, greenhouse gases lead to increasing temperature of the earth.

Question 33 Marks

In the coastal areas, as compared to continental areas, the temperature of air is lower during the day but warmer at night.

Answer

There is difference in the heating and cooling of land and water.
The air over the land gets heated faster and also cools rapidly.
The air over the water gets heated slowly and also loses the heat in a slower manner.
The temperature of air is lower during the day but warmer at night, in the coastal areas when compared to continental areas.

Question 43 Marks

The temperature near the sea level is higher and it decreases in the mountainous region.

Answer

Firstly, the sea water gets heated by the rays of the sun.
The absorbed heat is later radiated into the atmosphere.
So, the layer of air close to the surface gets heated.
This heat gets transferred vertically to the adjacent upper layers of air.
Therefore, the temperature near the sea level is higher and it decreases at the mountainous region.

Question 53 Marks

There is unequal distribution of heat received from the Sun.

Answer

The unequal distribution of heat received from the Sun is because:

The earth is spherical in shape.
The rays which fall on the equator are straight, occupy less area and give more heat.
The rays which fall on the curvature i.e., on the polar regions are slant rays which occupy large area and give less heat.

Geography Give geographical resons.