biology - environment

Class 10 - Biology

Environment

Q&A
Question:

What is meant by incineration ? For what purpose is it used ?

Answer:

Incineration means reducing to ashes. It is used to destroy the household waste, chemical waste and biological waste.



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Questions and Answers


Environment - Questions
1.

Write the name and formula of a molecule made up of three atoms of oxygen. [All India]


Answer
2.

Define ozone layer?


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3.

What are the after effects of ozone depletion?


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4.

Name the process by which the volume of solid wastes can be reduced.


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5.

Write the full form of CFC. Give its one harmful effect.


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6.

What are the causes of depletion of ozone layer ? Which diseases are likely to be caused if the ozone layer will become thinner ?


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7.

Write the harmful effects of ozone depletion.


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8.

Why are crop fields known as artificial ecosystems?


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9.

Suggest any four activities in daily life which are eco-friendly.


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10.

What happens when higher energy ultraviolet radiations act on the oxygen at the higher level of the atmosphere? [All India]


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11.

Why is it necessary to manage our garbage?


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12.

(a) What is meant by ‘environment’ ?
(b) What type of substances are the major pollutants of the environment ? Name two such substances.
(c) Name the organisms whose uncontrolled activities are damaging the environment.
(d) Explain why, it is better to use paper bags than plastic bags.


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13.

What percentage of the solar energy is trapped and utilised by the plants ?


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14.

Which radiations are absorbed by ozone layer ?


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15.

Explain how, harmful ultraviolet radiations of sunlight are prevented from reaching the earth’s surface.


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16.

What is meant by incineration ? For what purpose is it used ?


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17.

What is sewage ? How is sewage disposed of ?


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18.

What would happen if the ozone layer in the atmosphere completely disappears ?


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19.

How is the increase in demand for energy affecting our environment adversely?


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20.

What are the two main components of our environment? [Delhi]


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21.

Which disease is caused in human beings due to depletion of ozone layer in the atmosphere? [Foreign]


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22.

How is ozone formed in the upper atmosphere? Why is the damage of ozone layer a cause of concern to us? State a cause of this damage. [Delhi(C)]


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23.

Why is it necessary to conserve our environment? [All India]


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24.

What is the role of decomposers in the ecosystem? [Foreign]


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25.

List two man-made ecosystems. [All India]


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26.

Why is the ozone layer loss more in cold regions?


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27.

Fill in the following blanks with suitable words : Fill in the following blanks with suitable words :
(a) Decomposer organisms are……………. in their action.
(b) In nature, all green plants are……………. whereas animals are consumers.
(c) A series of organisms, each of which feeds on the next organism, the beginning of which is a green plant, is called a…………….
(d) The science that deals with the inter-relationships of living things with one another and their environment is called …………….
(e) Plastic is a……………. material whereas paper is a……………. material.


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28.

What is meant by a primary consumer, secondary consumer and a tertiary consumer ? Give one example of each.


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29.

Consider the food chain :
Grass → Deer → Lion
What will happen if all the lions are removed from the above food chain ?


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30.

We do not clean ponds or lakes but an aquarium needs to be cleaned periodically. Why ?


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31.

Name two waste materials which can be recycled.


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32.

State whether the following statement is true or false :
Only 10 per cent of the light energy given by the sun is available for transfer at each higher trophic level in a food chain.


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33.

How are most of the solid wastes in urban areas disposed of ?


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34.

Why is ozone layer getting depleted at the higher levels of the atmosphere? [Delhi (C)]


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35.

State two problems caused by the non- biodegradable waste that we generate in our daily life. [All India (C)]


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36.

Give an example to illustrate that indiscriminate use of pesticides may result-in the degradation of the environment. [All India]


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37.

Why are some substances non- biodegradable? [Foreign]


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38.

Which class of chemicals is linked to the decrease in the amount of ozone in the upper atmosphere of the earth? [Delhi]


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39.

Explain the effects of human activity on the environment?


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40.

Which one of the following is not a terrestial ecosystem ?
Forest, Grassland, Aquarium, Desert


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41.

What are planktons ?


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42.

A food chain represents a unidirectional flow of X. What is X ?


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43.

Explain the terms ‘producer’ and ‘consumer’. Give two examples of producers and two of consumers.


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44.

The number of malaria patients in a village increased tremendously when large number of frogs were exported from the village. What could be the cause for it ?


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45.

What percentage of energy available at the producer level is transferred at successive trophic levels in a food chain ?


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46.

Name the group of chemical compounds which damages the ozone layer.


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47.

Where does all the energy in living organisms originate from ?


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48.

Explain how harmful chemicals enter our bodies.


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49.

Give a method for the disposal of household wastes such as left-over food, fruit and vegetable peels, and leaves of potted plants.


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50.

State two advantages of using disposable paper cups over disposable plastic cups.


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