List two man-made ecosystems. [All India]
Garden and Pond are man-made ecosystems.
Why is it necessary to manage our garbage?
Why is it necessary to conserve our environment? [All India]
Which of the following belong to the same trophic level ?
Tree ; Frog ; Snake ; Grass ; Lizard
What will be the consequence of the absence of decomposers in the ecosystem ?
Name the group of chemical compounds which damages the ozone layer.
How are most of the solid wastes in urban areas disposed of ?
Write the harmful effects of ozone depletion.
How is the increase in demand for energy affecting our environment adversely?
Name any two abiotic components of an environment. [Delhi (C)]
Why are some substances non- biodegradable? [Foreign]
What is a food chain?
Why is the ozone layer loss more in cold regions?
What are the various steps of food chain called ?
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 ?
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 ?
What would happen if the ozone layer in the atmosphere completely disappears ?
Which disease is caused in human beings due to depletion of ozone layer in the atmosphere? [Foreign]
Name two natural ecosystems and two artificial ecosystems.
Write the full form of CFC. Give its one harmful effect.
Why is ozone layer getting depleted at the higher levels of the atmosphere? [Delhi (C)]
Which compounds are responsible for the depletion of ozone layer? [Delhi]
We do not clean ponds or lakes but an aquarium needs to be cleaned periodically. Why ?
Name the process by which the volume of solid wastes can be reduced.
What is meant by bioconcentration of pesticides ? Which common pesticide has accumulated in human body in considerable amounts ?
Give a method for the disposal of household wastes such as left-over food, fruit and vegetable peels, and leaves of potted plants.
What are the two main components of our environment? [Delhi]
Which organisms belong to third and fourth trophic levels in the food chain comprising the following ?
Rats, Plants, Hawk, Snakes
How does a biodegradable waste differ from a non-biodegradable waste ? Give two examples of non- biodegradable wastes which pollute our environment.
Why is improper disposal of waste a curse to environment?
Explain some harmful effects of agricultural practices on the environ-ment.
What happens when higher energy ultraviolet radiations act on the oxygen at the higher level of the atmosphere? [All India]
Why are plants called producers ?
What is meant by incineration ? For what purpose is it used ?
Name the wastes which are generated in your house daily. What measures would you take for their disposal?
State two problems caused by the non- biodegradable waste that we generate in our daily life. [All India (C)]
What is a food web?
What percentage of the solar energy is trapped and utilised by the plants ?
Why are there rarely more than five links (or five organisms) in a food chain ?
State two advantages of using disposable paper cups over disposable plastic cups.
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 ]
What are the after effects of ozone depletion?
Name the organisms belonging to the second and the fourth trophic levels in the food chain comprising the following :
Frogs, Plants, Snakes, Hawk, Insects
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 ?
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
Define ozone layer?
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.
Consider the food chain :
Grass â†’ Deer â†’ Lion
What will happen if all the lions are removed from the above food chain ?
Where does all the energy in living organisms originate from ?
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 â†’…………….â†’Human
(d) Lettuce â†’…………….â†’ Fox
(e) Plantsâ†’ Antelopeâ†’ …………….
Explain how harmful chemicals enter our bodies.