Chapter 14 – Natural Resources – Ankit Enterprises

What would happen, if all the oxygen present in the environment is converted to ozone?

(a) We will be protected more
(b) It will become poisonous and kill all living forms
(c) Ozone is not stable, hence it will be toxic
(d) It will allow harmful sun radiations to reach earth and damage many life forms

When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of nitrogen?

(a) It moves along with oxygen into the cells
(b) It comes out with the carbon dioxide during exhalation
(c)It is absorbed only by the nasal cells
(d) Nitrogen concentration is already more in the cells, so itis not at all absorbed

There is always a cycle of CO2 running in the atmosphere due to which the concentration of CO2 remains constant in the atmosphere. Choose the correct sequence of this cycle:

(a) CO2 in atmosphere→ decomposers → organic carbon in animals → inorganic carbon in soil
(b) CO2 in atmosphere → organic carbon in plants →organic carbon in animals → inorganic carbon in soil
(c)Inorganic carbonates in water →organic carbon in plants → organic carbon in animals → scavengers.
(d) Organic carbon in animals → decomposers → CO2 in atmosphere →organic carbon in plants

You must have observed that during the winters sometimesit becomes quite difficult to see even the objects short distance apart. This low visibility during the cold weather is due to:

(a) Formation of fossil fuels
(b) Unburnt carbon particles of hydrocarbons suspended in air
(c) Lack of adequate power supply
(d) None of these

The ‘water pollution’ can be defined in several ways. Which of the following statements does not give the correct definition?

(a) The addition of the undesirable substances to water bodies
(b) The removal of the desirable substances from water bodies
(c)A change in pressure of the water bodies
(d) A change in temperature of the water bodies

The amount of nitrogen in the atmosphere is maintained by a biological cycle which involves two processes, first is to withdraw nitrogen from the atmosphere and secondly to add the same to atmosphere.

The nitrogen cycle
Can you guess the names of these two respective processes.

(a) Nitrogen fixation and nitrification
(b) Nitrogen fixation and denitrification
(c)Nitrification and denitrification
(d) Nitrification and nitrogen fixation

Ozone layer is a protective blanket in the atmosphere that protectsus from the harmful high energy UV radiations coming from the sun. But it has been observed that some harmful air pollutants like chlorofluorocarbons are causing hole in this protective layer. What does this ‘ozone hole’ exactly mean?

(a) A large sized hole in the ozone layer
(b) Thinning of the ozone layer
(c)Small holes scattered in the ozone layer
(d) Thickening of the layer

Aquatic organisms are used to a certain range of temperature in the water bodies where they live. A sudden marked change in this temperature can affect:
i. Breeding of animals
ii. Growth of the aquatic plants
iii. Process of digestion in animals
iv. Availability of nutrients
Choose the correct option from the following:

(a) (i) and (ii)
(b) (i) and (iv)
(c) Only (ii)
(d) (ii) and (iii)

Presence of the fertilizers and sewage in polluted water provides a lot of nitrogen, causing excessive growth of algae which subsequently reduces the amount of dissolved oxygen in water.Can you name this process of reduction of dissolved oxygen due to the excess growth of algae.

(a) Biomagnifications
(b) Eutrophication
(c)Algal bloom
(d) Decopmposition

A cool breeze after a hot day brings all of us considerable relief. This breeze is actually the moving air. What is the basic process that causes this movement of air?

(a) Pressure difference between the air of two regions
(b) Moving leaves of the plants
(c)Temperature difference between the two regions
(d) Striking of air with the mountains

If the carbon dioxide content in the atmosphere is increased then which one of the following would not get affected?

(a) Amount of the heat retained by the environment
(b) Process of photosynthesis in plants
(c) Global warming
(d) Existence of desert plants

The nitrogen molecules present in air can be converted into nitrates by:

(a) A biological process of nitrogen fixing bacteria present in the soil
(b) A biological process of carbon fixing factor present in the soil
(c) Any of the industries manufacturing nitrogenous compounds
(d) The plants used as cereal crops in field

Top soil is the best for the vegetation. The main components ofthis productive top layer are:

(a) Humus and living organisms only
(b) Humus and soil particles only
(c) Humus, living organisms and plants
(d) Humus, living organisms and soil particles

The process of nitrogen fixation by bacteria does not take place in the presence of:

(a) Molecular form of hydrogen
(b) Elemental form of oxygen
(c) Water
(d) Elemental form of nitrogen

Following is the diagram showing the natural Ecosystem comprising both of abiotic as well as biotic components.

The Biotic components of an ecosystem consist of:

(a) Producers
(b) Consumers
(c) Decomposers
(d) All of these

What is the constitution of nitrogen in our atmosphere?

(a) 28
(b) 78
(c) 55
(d) 92

Which of the following bacteria is responsible for nitrogen fixation?

(a) Pseudomonas
(b) Nitrosomonas
(c) Rhizobium
(d) None of these

One of the following factors does not lead to soil formation in nature.

(a) The sun
(b) Water
(c) Wind
(d) Polythene bags

Which step is not involved in the carbon cycle?

(a) Photosynthesis
(b) Transpiration
(c) Respiration
(d) Burning of fossil fuels

The main function of the Rhizobium bacteria is:

(a) To convert free nitrogen into nitrates
(b) To convert the nitrates into nitrogen
(c) Decomposition of ammonium salts
(d) Denitrification

Soil pollution mostly occurs by:

(a) Water
(b) Fertilizers and insecticides
(c) Mining
(d) Crops

What is the percentage constitution of carbon dioxide in the atmosphere of Venus and Mars?

(a) 95 – 97%
(b) 20 – 22%
(c) 35 – 40%
(d) 70 – 72%

Oxygen is found in the elemental form in the atmosphere to the extent of:

(a) 78%
(b) 38%
(c) 21%
(d) 95%

Fill in the blank

In Venus and Mars, the major component of the atmosphere is found to be

Fill in the blank

Air, water, and soil are the component of the biosphere.

Fill in the blank

Biogeochemical cycles always in nature.

Fill in the blank

Carbon dioxide is one of the

Fill in the blank

Oxygen is returned to the atmosphere through only one major process, that is

Fill in the blank

Elemental oxygen is normally found in the form of a molecule.

Fill in the blank

Uneven heating of air over land and water bodies causes

Chapter 14 – Natural Resources

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