|
How is ozone formed in the upper atmosphere? What causes its damage?
|
|
0
|
6456
|
March 16, 2018
|
|
What are the advantages of cloth bags over plastic bags during shopping?
|
|
0
|
1422
|
March 16, 2018
|
|
Describe any four modes of disposal of waste
|
|
0
|
4129
|
March 16, 2018
|
|
Give three characteristics of food chain
|
|
0
|
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:
|
|
0
|
12421
|
March 16, 2018
|
|
Why does vegetarian habit help us in getting more energy?
|
|
0
|
7243
|
March 16, 2018
|
|
Give two differences between food chain and food web
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|
0
|
3765
|
March 16, 2018
|
|
“Energy flow in food chains is always unidirectional.”
|
|
0
|
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
|
|
0
|
1225
|
March 16, 2018
|
|
What is biodiversity? What will happen if biodiversity of an area is not preserved? Mention one effect of it
|
|
0
|
4932
|
March 16, 2018
|
|
The existence of decomposers is essential in a biosphere.Flow of energy in a food chain is unidirectional
|
|
0
|
9745
|
March 16, 2018
|
|
Differentiate between biodegradable and non-biodegradable substances with the help of one example each
|
|
0
|
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?
|
|
0
|
3419
|
March 16, 2018
|
|
What are the by-products of fertiliser industries? How do they affect the environment?
|
|
0
|
1139
|
March 16, 2018
|
|
State any two practices which can help in the protection of our environment
|
|
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
|
|
0
|
4473
|
March 16, 2018
|
|
Why does a food chain consist of only three to four steps?
|
|
0
|
1149
|
March 16, 2018
|
|
What is the percentage of solar energy trapped and utilised?
|
|
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?
|
|
0
|
7679
|
March 16, 2018
|
|
Write common food chain of a pond ecosystem
|
|
0
|
9998
|
March 16, 2018
|
|
Which of the following belongs to the same trophic level?
|
|
0
|
855
|
March 16, 2018
|
|
Consider the food chain: Grass---> Deer---> Lion. What will happen if lions are removed from the above food chain?
|
|
0
|
5731
|
March 16, 2018
|
|
Why are bacteria and fungi called decomposers?
|
|
0
|
18113
|
March 16, 2018
|
|
The physical and biological world where we live in
|
|
0
|
5482
|
March 16, 2018
|
|
Why are the crop fields known as artificial ecosystems?
|
|
0
|
2370
|
March 16, 2018
|
|
Name the wastes which are generated in your house daily
|
|
0
|
2877
|
March 16, 2018
|
|
Suggest any five activities in daily life which are eco-friendly
|
|
0
|
5521
|
March 16, 2018
|
|
"Energy flow in a food chain in unidirectional." Justify this statement
|
|
4
|
15716
|
February 12, 2018
|
|
Explain some harmful effects of agricultural practices on the environment
|
|
0
|
7905
|
September 26, 2016
|
|
What are the by-products of fertilizer industries? How do they affect the environment?
|
|
0
|
2397
|
September 26, 2016
|