|
How is ozone formed in the upper atmosphere? What causes its damage?
|
|
0
|
6461
|
March 16, 2018
|
|
What are the advantages of cloth bags over plastic bags during shopping?
|
|
0
|
1423
|
March 16, 2018
|
|
Describe any four modes of disposal of waste
|
|
0
|
4134
|
March 16, 2018
|
|
Give three characteristics of food chain
|
|
0
|
4079
|
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
|
12460
|
March 16, 2018
|
|
Why does vegetarian habit help us in getting more energy?
|
|
0
|
7299
|
March 16, 2018
|
|
Give two differences between food chain and food web
|
|
0
|
3848
|
March 16, 2018
|
|
“Energy flow in food chains is always unidirectional.”
|
|
0
|
1634
|
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
|
1240
|
March 16, 2018
|
|
What is biodiversity? What will happen if biodiversity of an area is not preserved? Mention one effect of it
|
|
0
|
4942
|
March 16, 2018
|
|
The existence of decomposers is essential in a biosphere.Flow of energy in a food chain is unidirectional
|
|
0
|
9750
|
March 16, 2018
|
|
Differentiate between biodegradable and non-biodegradable substances with the help of one example each
|
|
0
|
4704
|
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
|
3438
|
March 16, 2018
|
|
What are the by-products of fertiliser industries? How do they affect the environment?
|
|
0
|
1141
|
March 16, 2018
|
|
State any two practices which can help in the protection of our environment
|
|
0
|
4097
|
March 16, 2018
|
|
With the help of an example explain how indiscriminate use of pesticides may result in the degradation of the environment
|
|
0
|
4484
|
March 16, 2018
|
|
Why does a food chain consist of only three to four steps?
|
|
0
|
1164
|
March 16, 2018
|
|
What is the percentage of solar energy trapped and utilised?
|
|
0
|
994
|
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
|
7693
|
March 16, 2018
|
|
Write common food chain of a pond ecosystem
|
|
0
|
10004
|
March 16, 2018
|
|
Which of the following belongs to the same trophic level?
|
|
0
|
858
|
March 16, 2018
|
|
Consider the food chain: Grass---> Deer---> Lion. What will happen if lions are removed from the above food chain?
|
|
0
|
5750
|
March 16, 2018
|
|
Why are bacteria and fungi called decomposers?
|
|
0
|
18122
|
March 16, 2018
|
|
The physical and biological world where we live in
|
|
0
|
5489
|
March 16, 2018
|
|
Why are the crop fields known as artificial ecosystems?
|
|
0
|
2377
|
March 16, 2018
|
|
Name the wastes which are generated in your house daily
|
|
0
|
2878
|
March 16, 2018
|
|
Suggest any five activities in daily life which are eco-friendly
|
|
0
|
5522
|
March 16, 2018
|
|
"Energy flow in a food chain in unidirectional." Justify this statement
|
|
4
|
15752
|
February 12, 2018
|
|
Explain some harmful effects of agricultural practices on the environment
|
|
0
|
7910
|
September 26, 2016
|
|
What are the by-products of fertilizer industries? How do they affect the environment?
|
|
0
|
2405
|
September 26, 2016
|