SSLC (English Medium) Class 9 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Social Science

Give reason for the following.

Oceans are the lifelines of Earth and Mankind.

Give reason for the following.

Most of the Creek area get submerged.

“71% of the earth is covered by water but very little can be used by humans. Why?

The oceans are salty. Why?

Why is the salinity at the equator less even though it experiences high temperature?

“Though Caspian Sea is enclosed its salinity is just 14 to 17 parts per thousand. Why is it so?

In Temperate Grass Lands Biome higher precipitation leads to ______ grass.

In Temperate Grassland Biomes lower precipitation leads to ______ grass.

Tundra Biomes are also called ______.

Lakes, ponds, rivers, streams, wetlands together known as ______ biomes.

In aquatic ecosystem, there is abundant water with limited ______ supply.

Terrestrial animals use only 1 – 2% of energy to obtain ______.

There are ______ Biosphere Reserves in India.

Assertion (A): In temperate grassland biomes pastoral industry becomes the main occupation.
Reason (R): Apart from wheat cultivation, tall and short soft grass are grown in the
temperate grassland biomes.

Assertion (A): Biosphere Reserves are established in India.
Reason (R): Today’s loss of biodiversity is habitat alteration caused by human activities.

What is considered a hotspot?

In India where do we find hot spots?

Mention the human settlement in the Tropical Forest Biomes.

What threat is posed by the savanna grasslands?

What has been identified by the U.S. National Cancer Institute?