|
Global carbon is fixed in the biosphere through photosynthesis.Explain any two ways by which carbon is returned to the atmosphere
|
|
0
|
1382
|
September 4, 2016
|
|
Name the two type of nutrient cycles existing in nature. Where are their reservoirs present? State the functions of the reservoirs
|
|
0
|
1525
|
September 4, 2016
|
|
State the function of a reservoir in a nutrient cycle. Explain the simplified model of carbon cycle in nature
|
|
0
|
2042
|
September 4, 2016
|
|
Explain the carbon cycle with the help of a simplified model
|
|
0
|
4244
|
September 4, 2016
|
|
Name the pioneer species on a bare rock. How do they help in establishing the next type of vegetation? Mention the type of climax community that will ultimately get established
|
|
0
|
2678
|
September 4, 2016
|
|
Differentiate between two different types of pyramids of biomass with the help of one example of each
|
|
0
|
4527
|
September 4, 2016
|
|
Construct labelled grazing and detritus food chains with minimum three trophic levels each
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|
0
|
1176
|
September 4, 2016
|
|
Why is it difficult to get rid of water hyacinth from a water body? Name one abiotic component and one biotic component of the ecosystem that get affected by its spread in the water body
|
|
0
|
4000
|
September 4, 2016
|
|
Explain standing crop in an ecosystem. Draw a pyramid of biomass when a small standing crop of phytoplanktons supports a large standing crop of zooplanktons in the sea
|
|
0
|
4166
|
September 4, 2016
|
|
Name the type of food chains responsible for the flow of larger fraction of energy in an aquatic and a terrestrial ecosystem respectively.Mention one difference between the two food chains
|
|
0
|
2400
|
September 4, 2016
|
|
Identify the type of the given ecological pyramids and give one example each of pyramid of number and pyramid of biomass in such cases
|
|
1
|
1968
|
September 4, 2016
|
|
State what does standing crop of a trophic level represent
|
|
0
|
1507
|
September 4, 2016
|
|
It is possible that a species may occupy more than one trophic level in the same ecosystem at the same time. Explain with the help of one example
|
|
0
|
3680
|
September 4, 2016
|
|
Why the pyramid of energy is always upright? Explain
|
|
0
|
4246
|
September 4, 2016
|
|
What is a detritus food chain made up of ? How do they meet their energy and nutritional requirements?
|
|
0
|
1676
|
September 4, 2016
|
|
Describe the process of decomposition of detritus under the following heads :
|
|
1
|
3890
|
September 4, 2016
|
|
Explain primary productivity and the factors that influence it
|
|
1
|
1542
|
September 4, 2016
|
|
What is primary productivity? Why does it vary in different types of ecosystems?
|
|
1
|
2132
|
September 4, 2016
|
|
Write a difference between net primary productivity and gross productivity
|
|
0
|
1218
|
September 4, 2016
|
|
Write the equation that helps in deriving the net primary productivity of an ecosystem
|
|
0
|
854
|
September 4, 2016
|
|
How is 'stratification' represented in a forest ecosystem?
|
|
0
|
1328
|
September 4, 2016
|