NEET Special | Why does secondary succession is faster?

April 9, 2023 / 05:05 PM IST

ECOSYSTEM

ఏప్రిల్ 07 త‌రువాయి

40. Areas where secondary succession occurs?
A) Burned and cut forests areas
B) Land that have been flooded
C) Abandoned farm lands
D) All are correct
41. Which one of the following is not the part of hydrarch succession ?
A) Scrub stage B) Tree
C) Zooplankton
D) Submerged plant stage
42. Why does secondary succession is faster?
A) Because soil is already there
B) They have special power
C) Growth of plants is faster
D) All of these
43. The amount of nutrients such as carbon, nitrogen, phosphorus, calcium etc present in the soil at any given time is referred to as the ?
A) Nutrients cycle B) Standing crop
C) Standing state D) None of these
44. Environmental factor to regulate the rate of release of nutrients into the atmosphere.
A) Soil B) Moisture
C) Temperature & pH
D) All of the above
45. Which is the first & second most abundant constituent of an organism?
A) Water, phosphorus
B) Water, carbon
C) Carbon, water D) Carbon, phosphorus
46. How much at carbon in fixed annually in the biosphere through photosynthesis?
A) 8 × 1012 kg
B) 4 × 1012 kg
C) 4 × 1013 kg
D) 4.9 × 10 kg
47. Phosphorus is a major constituent of?
A) Biological membranes B) Nucleic acids
C) Cellular energy transfer unit
D) All of the above
48. The waste products and the dead organism are decomposed by ________ releasing phosphorus?
A) Fungi
B) Phosphate-solubilising bacteria
C) Phosphate-unsolubising bacteria
D) None of the above
49. Choose the more correct statement.
A) Gaseous exchange at phosphorus b/w organism & environment are very high
B) Gaseous exchange of phosphorus b/w organism & environment are low
C) Gaseous exchange at phosphorus b/w organism & environment are negligible
D) None at these
50. In natural reservoirs, phosphorus present in the form of ?
A) Phosphite
B) Pyrophosphate
C) Phosphates
D) None of the above
51. Which one of the following is not a Gaseous nutrient cycle?
A) Oxygen cycle B) Nitrogen cycle
C) Sulphur cycle D) None of the above
52. The products of ecosystem processes are named as?
A) Environmental services B) Ecosystem goods
C) Ecosystem services
D) All of the above
53. Examples of Ecosystem services?
A) Healthy forest ecosystem purify air & water
B) Generate fertile soil
C) Provide storage site for carbon
D) All of the above
54. GNP stands for ?
A) Grand national product
B) Gross national product
C) Gross national produce
D) None of these
55. Out of the total cost at various ecosystem services the soil formation accounts for about?
A) 40% B) 60% C) 50% D) 30%
56. The value of the global GNP?
A) US $ 28 trillion B) US $ 18 Billion
C) US $ 33 trillion D) US $ 18 trillion
57. Choose the correct statement.
A) Value of Ecosystem services at biodiversity is difficult to determine.
B) Value of Ecosystem services of biodiversity is very easy to determine.
C) No need to determine the value of Ecosystem services.
D) None of these
58. Which one of the following is odd one out from others?
A) Decomposition B) Energy flow
C) Nutrient cycling D) None
59. The entire sequence of communities that successively change in a given area are called?
A) Ecosystem B) Pioneer
C) Sere D) All of these
60. Pyramid of energy is
A) Always inverted B) Sometime upright
C) Always upright D) Sometimes inverted