Natural Resources Science - Natural Resources

Pollution of water is caused by:

1. Industrial effluents.
2. Sewage.
3. Farm runoff.
4. All of these.

What is nitrogen fixation? Describe this phenomenon in context with N₂cycle.

Wind breaks are:

1. Raising edges of fields.
2. Growing grasses altemating with crops.
3. Mud walls.
4. Rows of trees and shrubs.

Percentage of total water found as fresh water is:

1. 46%
2. 32%
3. 16%
4. 2.5%

Rajasthan and Gujarat fall under:

1. Semiarid zone.
2. Arid zone.
3. Intermediate zone.
4. Wet zone.

Atmosphere of Mars is rich in ____________.

CFCs are carbon compounds having both ___________ and chlorine.

Surface temperature of moon varies from -190° to __________.

__________ makes soil porous and allows water and air to peneterate deep underground.

Earthworms are __________ which are involved in paedogenesis.

Soil has no role in supplying nutrients to awuatic biota.

Fertilizers adn pesticides are harmful to soil as they kill the microorganisms involved in recycling of nutrients.

Winds develop due to uneven heating of Earth.

Chlorine containing substances are not ODS.

Soil is topmost layer of crust of Earth.

Name the component present in marble which reacts with acids present in acid rain.

Name two fresh water sources which provide fresh water for human use.

What is the major component of atmosphere of Earth and Mars/ Venus ?

Name parts of India with maximum diversity.

What percentage of carbon dioxide is present in the atmosphere?

What is soil pollution?

Name the physical divisions of biosphere.

How is oxygen replenished in nature?

What is ODS?

Name the articles which act as nucleus for water droplets to form around in the atmosphere.

Define the soil? Give its composition and functions.

Explain the following:

1. Eutrophication.
2. Biomagnification.

How are winds produced?

What is biomagnifications? Name two heavy metals which, when magnified resulted in diseases in humans.

Enumerate the factors that influence movement of air.

Define soil erosion. Give its causes, effects and preventive measures.