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Organisms and Populations

Short Answer Type

41. List the various abiotic environmental factors factors.

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42. If a marine fish is placed in a fresh water aquarium, will the fish be able to survive ? Why or why not ?

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43. Define phenotypic adaptation. Give one example.

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44. Most living organisms cannot survive at temperature at about 45°C. How are some microbes able to live in habitats with temperatures exceeding 100°C ?

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Long Answer Type

45. List the attributes that populations possess but not the individuals.

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46.
If the population growing exponentially doubles in size in 3 years, what is the intrinsic rate of increase (r) of the population?

The intrinsic rate of increase (r) of such a population will be towards maximum.

Intrinsic rate of increase (r) of population can be calculated by applying following equation:

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47. Name important defence mechanisms in plants against herhivory.

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Short Answer Type

48. An orchid plant is growing on the branch of mango tree. How do you describe this interaction between the orchid and the mango tree ?

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49. What is the ecological principle behind the biological control method of managing with pest insect ?

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50. Distinguish between the following :

(a) Hiberation and aestivation

(b) Ectotherms and endotherms.

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Previous Year Papers

Test Series

Test Yourself

Short Answer Type

Long Answer Type

46. If the population growing exponentially doubles in size in 3 years, what is the intrinsic rate of increase (r) of the population?

Short Answer Type

46.
If the population growing exponentially doubles in size in 3 years, what is the intrinsic rate of increase (r) of the population?