31. With reference to food chains in ecosystems, consider the following statements:
1. A food chain illustrates the order in which a chain of organisms feeds upon each other.
2. Food chains are found within the populations of a species.
3. A food chain illustrates the numbers of each organism that is eaten by others.
Which of the statements given above is/are correct?
a) 1 only
b) 1 and 2 only
c) 1, 2 and 3
d) None
Answer. A)
32. Consider the following pairs:
National Park River flowing through the Park
1. Corbett National Park: Ganga
2. Kaziranga National Park Manas
3. Silent Valley National Park Kaveri
Which of the above pairs is/are correctly matched?
a) 1 and 2
b) 3 only
c) 1 and 3
d) None
Answer. d)
33. Consider the following organisms:
1. Agaricus
2. Nostoc
3. Spirogyra
Which of the above is/are used as biofertilizers/biofertilizers?
a) 1 and 2
b) 2 only
c) 2 and 3
d) 3 only
Answer. b)
34. Which of the following adds/adds nitrogen to the soil?
1. Excretion of urea by animals
2. Burning of coal by man
3. Death of vegetation
Select the correct answer using the codes given below:
a) 1 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2 and 3
Answer. c)
35. In which of the following States is lion-tailed macaque found in its natural habitat?
1. Tamil Nadu
2. Kerala
3. Karnataka
4. Andhra Pradesh
Select the correct answer using the codes given below:
a) 1, 2, and 3 only
b) 2 only
c) 1, 3, and 4 only
d) 1, 2, 3 and 4
Answer. a)
36. Which one of the following terms describes not only the physical space occupied by an organism but also its functional role in the community of organisms?
a) Ecotone
b) Ecological niche
c) Habitat
d) Home range
Answer. b)
37. Photochemical smog is a resultant of the reaction among
a) NO2, O3, and peroxyacetyl nitrate in the presence of sunlight
b) CO, O2, and peroxyacetyl nitrate in the presence of sunlight
c) CO, CO2, and NO2 at low temperature
d) the high concentration of NO2, O3, and CO in the evening
Answer. A)
ConversionConversion EmoticonEmoticon