Practice Start Test

Ecosystem

NEET Biology · 70 questions · Page 7 of 7 · Click an option or "Show Solution" to reveal answer

Q61
In which of the following both pairs have correct combination?
A Gaseous nutrient cycle - Carbon and sulphur; Sedimentary nutrient cycle - Nitrogen and Phosphorus
B Gaseous nutrient cycle - Nitrogen and sulphur; Sedimentary nutrient cycle - Carbon and Phosphorus
C Gaseous nutrient cycle - Sulphur and Phosphorus; Sedimentary nutrient cycle - Carbon and Nitrogen
D Gaseous nutrient cycle - Carbon and Nitrogen; Sedimentary nutrient cycle - Sulphur and Phosphorus
Correct Answer
Option D
Solution

(d) Carbon and Nitrogen have gaseous nutrient cycles. Sulphur and phosphorus have sedimentary nutrient cycles.

Q62
Which of the following would appear as the pioneer organisms on bare rocks?
A Lichens
B Liverworts
C Mosses
D Green algae
Correct Answer
Option A
Solution

(a) Lichens are pioneer organisms on bare rocks as they dissolve rock minerals.

Q63
Which of the following ecosystems has highest rate of gross primary production?
A Grasslands
B Mangroves
C Coral reefs
D Equatorial rain forest
Correct Answer
Option D
Solution

(d) Equatorial forest has highest gross primary production (about 12000 kcal/m2/yr).

Q64
Which of the following does not have stomata?
A hydrophytes
B mesophytes
C xerophytes
D submerged hydrophytes
Correct Answer
Option D
Solution

(d) In submerged hydrophytes, stomata is absent and gaseous exchange takes place through general body surface.

Q65
Which of the following is a characteristic feature of cropland ecosystem?
A Absence of soil organisms
B Least genetic diversity
C Absence of weeds
D Ecological succession
Correct Answer
Option B
Solution

(b) Cropland ecosystem is the largest anthropogenic ecosystem characterized by less diversity and high productivity.

Q66
Vertical distribution of different species occupying different levels in a biotic community is known as:
A Stratification
B Zonation
C Pyramid
D Divergence
Correct Answer
Option A
Solution

(a) Stratification is the occurrence of vertical zonation in the ecosystem.

Q67
The biomass available for consumption by the herbivores and the decomposers is called:
A net primary productivity
B secondary productivity
C standing crop
D gross primary productivity
Correct Answer
Option A
Solution

(a) Net primary productivity is the biomass available for consumption by herbivores and decomposers.

Q68
In an ecosystem the rate of production of organic matter during photosynthesis is termed as
A Gross primary productivity
B Secondary productivity
C Net productivity
D Net primary productivity
Correct Answer
Option A
Solution

(a) Gross Primary Productivity (GPP) is the rate of production of biomass or accumulation of energy by green plants.

Q69
What is true of ecosystem?
A Primary consumers are least dependent upon producers
B Primary consumers out-number producers
C Producers are more than primary consumers
D Secondary consumers are the largest and most powerful
Correct Answer
Option C
Solution

(c) Producers (plants) are always more numerous than consumers.

Q70
Both, hydrarch and xerarch successions lead to
A medium water conditions
B xeric conditions
C highly dry conditions
D excessive wet conditions
Correct Answer
Option A
Solution

(a) Both successions converge toward a mesic (medium water) climax community.

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