How is ozone formed in the upper atmosphere? What causes its damage?
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0
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6456
|
March 16, 2018
|
What are the advantages of cloth bags over plastic bags during shopping?
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0
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1422
|
March 16, 2018
|
Describe any four modes of disposal of waste
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0
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4129
|
March 16, 2018
|
Give three characteristics of food chain
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0
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4054
|
March 16, 2018
|
Calculate the amount of energy available to tiger in the following food chain if plants have 30,000 J of energy available from the Sun:
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0
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12421
|
March 16, 2018
|
Why does vegetarian habit help us in getting more energy?
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0
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7243
|
March 16, 2018
|
Give two differences between food chain and food web
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0
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3765
|
March 16, 2018
|
“Energy flow in food chains is always unidirectional.”
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0
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1603
|
March 16, 2018
|
What is an ecosystem? List its two main components. We do not clean natural ponds or lakes but an aquarium needs to be cleaned regularly.c
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0
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1225
|
March 16, 2018
|
What is biodiversity? What will happen if biodiversity of an area is not preserved? Mention one effect of it
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0
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4932
|
March 16, 2018
|
The existence of decomposers is essential in a biosphere.Flow of energy in a food chain is unidirectional
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0
|
9745
|
March 16, 2018
|
Differentiate between biodegradable and non-biodegradable substances with the help of one example each
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0
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4687
|
March 16, 2018
|
The number of malarial patients in a village increased tremendously when large number of frogs were exported from the village. What could be the cause for this?
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0
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3419
|
March 16, 2018
|
What are the by-products of fertiliser industries? How do they affect the environment?
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0
|
1139
|
March 16, 2018
|
State any two practices which can help in the protection of our environment
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0
|
4093
|
March 16, 2018
|
With the help of an example explain how indiscriminate use of pesticides may result in the degradation of the environment
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0
|
4473
|
March 16, 2018
|
Why does a food chain consist of only three to four steps?
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0
|
1149
|
March 16, 2018
|
What is the percentage of solar energy trapped and utilised?
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0
|
990
|
March 16, 2018
|
In a lake contaminated with pesticides, which one of the following organism living in the lake will contain the maximum amount of pesticide?
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0
|
7679
|
March 16, 2018
|
Write common food chain of a pond ecosystem
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0
|
9998
|
March 16, 2018
|
Which of the following belongs to the same trophic level?
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0
|
855
|
March 16, 2018
|
Consider the food chain: Grass---> Deer---> Lion. What will happen if lions are removed from the above food chain?
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0
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5731
|
March 16, 2018
|
Why are bacteria and fungi called decomposers?
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0
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18113
|
March 16, 2018
|
The physical and biological world where we live in
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0
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5482
|
March 16, 2018
|
Why are the crop fields known as artificial ecosystems?
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0
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2370
|
March 16, 2018
|
Name the wastes which are generated in your house daily
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0
|
2877
|
March 16, 2018
|
Suggest any five activities in daily life which are eco-friendly
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0
|
5521
|
March 16, 2018
|
"Energy flow in a food chain in unidirectional." Justify this statement
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4
|
15716
|
February 12, 2018
|
Explain some harmful effects of agricultural practices on the environment
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0
|
7905
|
September 26, 2016
|
What are the by-products of fertilizer industries? How do they affect the environment?
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0
|
2397
|
September 26, 2016
|