List two man-made ecosystems. [All India]


Garden and Pond are man-made ecosystems.



Q 1.

Why is it necessary to manage our garbage?

Q 2.

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

Q 3.

Which of the following belong to the same trophic level ?
Tree ; Frog ; Snake ; Grass ; Lizard

Q 4.

What will be the consequence of the absence of decomposers in the ecosystem ?

Q 5.

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

Q 6.

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

Q 7.

Write the harmful effects of ozone depletion.

Q 8.

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

Q 9.

Name any two abiotic components of an environment. [Delhi (C)]

Q 10.

Why are some substances non- biodegradable? [Foreign]

Q 11.

What is a food chain?

Q 12.

Why is the ozone layer loss more in cold regions?

Q 13.

What are the various steps of food chain called ?

Q 14.

Can the organisms of any trophic level be removed without causing any damage to the ecosystem ? Will the impact of removing all the organisms in a trophic level be different for different trophic levels ?

Q 15.

A student went to study a local pond. In one part of the pond she noticed tadpoles scraping at some pond weed. In another part she saw a water beetle holding a tadpole in its jaws.A student went to study a local pond. In one part of the pond she noticed tadpoles scraping at some pond weed. In another part she saw a water beetle holding a tadpole in its jaws.
(a) Construct a food chain for the pond.
(b) How many links are there in this chain ?

Q 16.

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

Q 17.

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

Q 18.

Name two natural ecosystems and two artificial ecosystems.

Q 19.

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

Q 20.

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

Q 21.

Which compounds are responsible for the depletion of ozone layer? [Delhi]

Q 22.

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

Q 23.

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

Q 24.

What is meant by bioconcentration of pesticides ? Which common pesticide has accumulated in human body in considerable amounts ?

Q 25.

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

Q 26.

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

Q 27.

Which organisms belong to third and fourth trophic levels in the food chain comprising the following ?
Rats, Plants, Hawk, Snakes

Q 28.

How does a biodegradable waste differ from a non-biodegradable waste ? Give two examples of non- biodegradable wastes which pollute our environment.

Q 29.

Why is improper disposal of waste a curse to environment?

Q 30.

Explain some harmful effects of agricultural practices on the environ-ment.

Q 31.

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

Q 32.

Why are plants called producers ?

Q 33.

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

Q 34.

Name the wastes which are generated in your house daily. What measures would you take for their disposal?

Q 35.

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

Q 36.

What is a food web?

Q 37.

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

Q 38.

Why are there rarely more than five links (or five organisms) in a food chain ?

Q 39.

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

Q 40.

In a food chain, 10,000 joules of energy is available to the producer. How much energy will be available to the secondary consumer to transfer it to the tertiary consumer? [All India ]

Q 41.

What are the after effects of ozone depletion?

Q 42.

Name the organisms belonging to the second and the fourth trophic levels in the food chain comprising the following :
Frogs, Plants, Snakes, Hawk, Insects

Q 43.

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 ?

Q 44.

Which of the following are biodegradable and which non-biodegradable ?
Glass bottle, Paper, Ball point pen refill, Hay, DDT, Wheat, Cake, Wood,
Polythene bag, Jute bag, Cotton cloth, Grass, Vegetable peels

Q 45.

Define ozone layer?

Q 46.

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.

Q 47.

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

Q 48.

Where does all the energy in living organisms originate from ?

Q 49.

Fill in the following blanks with suitable words :Fill in the following blanks with suitable words :
(a) Ultraviolet rays can cause skin…………………
(b) Pesticides enter the food chain at the…………………. level
(c) Grass →…………….→Human
(d) Lettuce →…………….→ Fox
(e) Plants→ Antelope→  …………….

Q 50.

Explain how harmful chemicals enter our bodies.