What are the major causes of species losses in a geographical region ?
Species are lost in a geographical region due to natural disturbances like forest fires; famine, drought and also due to human disturbance with over replantation, habitat destruction, habitat displacement, over specialization, intensive agriculture and pollution.
The species diversity of plants (22 per cent) is much less than that of animals (72 per cent).What could be the explanations to how animals achieved greater diversification?
What is an endangered species? Give an example of an endangered plant and animal species each.
How is the presently occurring species extinction different from the earlier mass extinctions?
Of the four major causes for the loss of biodiversity (Alien species invasion, habitat loss and fragmentation, over-exploitation and co-extinctions which according to you is the major cause for the loss of biodiversity? Give reasons in support.
Why are the conventional methods not suitable for the assessment of biodiversity of bacteria?
Suggest a place where one can go to study coral reefs, mangrove vegetation and estuaries.
Though the conflict between humans and wildlife started with the evolution of man, the intensity of conflict has increased due to the activities of modem man. Justify your answer with suitable examples.
What is an ecosystem service? List any four important ecosystem services provided by the natural ecosystems. Are you in favour or against levying a charge on the service provided by the ecosystem?
Can you think of a situation where we deliberately want to make a species extinct? How would you justify it?
According to David Tilman, greater the diversity, greater is the primary productivity. Can you think of a very low diversity man-made ecosystem that has high productivity?
Is it possible that productivity and diversity of a natural community remain constant over a time period of, say one hundred years?
Give three hypothesis for explaining why tropics '”show greatest levels of species richness.
Among the ecosystem services are control of floods and soil erosion. How is this achieved by the biotic components of the ecosystem?
Match the animals given in column A with their location in column B.
Choose the correct match from the following:
(a) i ”A, ii ”C, iii B, iv D (b) i ”D, ii”C, iii ”A, iv”B
(c) i”C, ii”A, iii”B, iv”D (d) iâC, iiA, iii”D, iv”B
The relation between species richness and area for a wide variety of taxa turns out to be a rectangular hyperbola. Give a brief explanation.
Explain as to how protection of biodiversity hot spots alone can reduce up to 30% of the current rate of species extinction.
There is greater biodiversity in tropical /subtropical regions than in temperate region. Explain.
Discuss one example, based on your day-to-day observations, showing how loss of one species may lead to the extinction of another.
Can you think of a scientific explanation, besides analogy used by Paul Ehrlich, for the direct relationship between diversity and stability of an ecosystem?
Describe the consumptive use value of biodiversity as food, drugs and medicines, fuel and fiber with suitable examples.
