Introduction to environment @9

The importance of the environment is

• To provide a habitat base for animals and plants

• To provide the source of food and energy needed by living beings

• To maintain the natural beauty

• all of the above

The non-living component of the environment is called

The type of atmosphere found about 16 km from the earth's surface is called

• troposphere

• stratosphere

• mesosphere

• thermosphere

The amount of oxygen present in the atmosphere is

• 78 %

• 21 %

• 1 %

• 0.04 %

The importance of air is

• Carbon dioxide is used by plants for cooking.

• air helps in the pollination and propagation of seeds in the plant.

• Organisms take in oxygen and emit carbon dioxide when they breathe.

• all of these

Chemically, water is made up to

• 1 atom of hydrogen and 1 atom of oxygen

• 1 atom of hydrogen and 2 atoms of oxygen

• 2 atoms of hydrogen and 1 atom of oxygen

• 2 atoms of hydrogen and 2 atoms of oxygen

The sources of water are divided into

• ground water

• surface water

• rain water

• all of these

The amount of humus in the soil determines

• acidity of soil

• alkalinity of soil

• neutrality of soil

• all of these

.......................... is made up of air, water, minerals, organic matter, and fine-grained rocks.

The amount of hotness and coldness of the body of an organism is called