Monday, May 26, 2008

organisms and population

1. What is Ecology?
2. What are the four levels of biological organization in ecology?
3. What is the cause of different seasons?
4. What are the factors, which account for the formation of biome?
5. Name any the five extreme and harsh habitat in which living organisms are present
6. Name the major biomes in India.
7. Name the major biomes in the world.
8. What are the various biotic components included in an ecosystem?
9. What determines the geographical distribution of the organism?
10. Name the organism, which can tolerate the wide range of temperature
11. What is stenothermal organism?
12. What is euryhaline organism?
13. How light is important for living organism?
14. Name the properties of soil that determines vegetation of any area?
15. Write the characteristics that decide the percolation and water holding capacity of the soil?
16. What is the approximate salt concentration of the following water bodies?
1. Inland water
2. Sea water
3. Hyper saline lagoons
17. What is homeostasis?
18. What are regulators? Name two methods by which they maintain Homeostasis.
19. What is the reason of success of mammals as evolved organisms?
20. How do mammals regulate their body temperature in summers and in winters?
21. Do plants regulate internal body temperature?
22. What are conformers?
23. Why are small animals like shrews and humming birds do not have thermoregulation?
24. Why are small animals not found in Polar Regions?
25. How do animals suspend the unfavorable conditions?
26. Define adaptation: -
27.Why North American Kangaroos does not drink water through out its life?
28.How are plants adapted to live in the deserts?
29.What is Allen’s Rule?
30.How seals reduce loss of body heat to live in polar seas.
31.what is altitude sickness? How our body solves this problem?
32.How are lizards adapted to live in dissert?
33. What is natality?
34. What is population?
35. How is dispause different from Hibernation?
36. If a marine fish is placed in a fresh water aquarium the fish is able to survive?
37. Define phenotypic adaptation with example.
38. Define population Ecology.
39.Calculate the birth rate if there are 100 plants in pond and a next year 20 new plants are added.
40. If 16 Drosophilae died in one week out of total 160 fruitflies calculate the death rate.

41. What are the following representation know as? Depict the future of the following pyramids
42.What is population density?
43.What is biotic potential? What cheeks the size of population?
44. How is growth of population measured?
45. If No is the population size Nt population size after time interval. What would be the change in population size?
B= No. Of births
I =No. Of immigrant
E= No of Emigrants
D= No. Of Deaths
46. Study the population curves in the graph given below and answer the following

1. Identify the growth curve.
2. Which are of them is considered more realistic one and why?
3. If dn/dt =rN is the equation of J shaped curve. What does N indicate?
4. Explain J shaped and S shaped curves of population growth
47. Name two methods that form the basis of tiger census.
48. If a population growing exponentially doubles in size in 3 years, what is the intrinsic rate of increase (r) of the population?
49. Give two processes that take place in any population size at increase population density.
50. Name processes that take place to decrease population size.
51. What is predation?
52. What role is played by predators in an ecosystem?
53. What type of mechanism has evolved by prey species to defend themselves from the predators?
54. How is the problem of predation more severe in plants?
55. What type of defense mechanism has developed by the plants against herbivores?
56. State Gause’s competitive Exclusion principle.
57.Give various adaptation found in parasites.
58. What is the effect of parasitism on host?
59. Female mosquitoes suck human blood. Is it a parasite?
60. Give an example of brood parasitism.
61. Name the type of interaction of the following:
1. Barnacles grow on the back of whale
2. Copepods in fest marine fishes
3. Goats have excluded Abingdon tortoise in Galapagos Islands.
4.A parasitic bird lays eggs in the host near for incubation.
5.Cattle ergot remains close to grazing so that insects can be traced when cattle move up.
6.Sea anemone lives with clown fish.
7.On fig trees a specific species of wasp is there.
62. Why the relationship between sea anemone and clown fish is said to be commensalisms?
63. Mycorrhizal associations are mutualism but not commensalisms.
64. Give an example of sexual deceit.
65. Explain obligate mutualism with an example.
66. Distinguish between Camouflage and Mimicry.
67.How Homoeothermic and poikilothermic organisms have adapted themselves?Assignment

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