Class 10 - Biology
Environment
What is meant by incineration ? For what purpose is it used ?
Incineration means reducing to ashes. It is used to destroy the household waste, chemical waste and biological waste.

Questions and Answers
What are the causes of depletion of ozone layer ? Which diseases are likely to be caused if the ozone layer will become thinner ?
What happens when higher energy ultraviolet radiations act on the oxygen at the higher level of the atmosphere? [All India]
(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.
Explain how, harmful ultraviolet radiations of sunlight are prevented from reaching the earth’s surface.
Which disease is caused in human beings due to depletion of ozone layer in the atmosphere? [Foreign]
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)]
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.
What is meant by a primary consumer, secondary consumer and a tertiary consumer ? Give one example of each.
Consider the food chain :
Grass → Deer → Lion
What will happen if all the lions are removed from the above food chain ?
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.
State two problems caused by the non- biodegradable waste that we generate in our daily life. [All India (C)]
Give an example to illustrate that indiscriminate use of pesticides may result-in the degradation of the environment. [All India]
Which class of chemicals is linked to the decrease in the amount of ozone in the upper atmosphere of the earth? [Delhi]
Which one of the following is not a terrestial ecosystem ?
Forest, Grassland, Aquarium, Desert
Explain the terms ‘producer’ and ‘consumer’. Give two examples of producers and two of consumers.
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 ?
What percentage of energy available at the producer level is transferred at successive trophic levels in a food chain ?
Give a method for the disposal of household wastes such as left-over food, fruit and vegetable peels, and leaves of potted plants.