Nutrient Cycle Test

Nutrient Cycle

This is online test 02 for CBSE class 12 Biology Ecosystem (Nutrient Cycle).. There are 10 questions in this test with each question having around four answer choices.

Questions & Answers

1
Ecological pyramids does not give any place to :
  • A
    Parasites
  • B
    Transducers
  • C
    Predators
  • D
    Saprophytes
    Correct
2
A tree providing food to several herbivores and parasitic organisms will represent:
  • A
    an inverted pyramid of number
    Correct
  • B
    an inverted pyramid of biomass
  • C
    an upright pyramid of number
  • D
    none of them
3
A more perfect biogeochemical cycle is:
  • A
    Carbon cycle
    Correct
  • B
    Calcium cycle
  • C
    Phosphorus cycle
  • D
    Sulphur cycle
4
The characteristic of soils such as soil composition, grain size and aggregation determine the
  • A
    Neither percolation nor water holding capacity of the soil.
  • B
    Only water holding capacity of the soil.
  • C
    Percolation and water holding capacity of the soil.
    Correct
  • D
    Only percolation rate of soil.
5
CAM plants have special photosynthetic pathway in which
  • A
    Leaves have layers of cuticles.
  • B
    Stomata never open.
  • C
    Stomata remain open during the day.
  • D
    Stomata remain closed during the day.
    Correct
6
Exponential growth occurs in the population in which sufficient
  • A
    Sufficient area is available.
  • B
    All of the above.
  • C
    Food and other nutrient are available.
    Correct
  • D
    Water is abundant.
7
Nutrient cycle in an ecosystem involves
  • A
    Carbon cycle only.
  • B
    Nitrogen cycle only.
  • C
    Neither nitrogen nor carbon cycles.
  • D
    Biogeochemical cycles.
    Correct
8
Recourse partitioning is the evolving mechanisms that promote
  • A
    Co-existence rather than exclusion.
    Correct
  • B
    Co-existence rather than competition.
  • C
    Exclusion rather than competition.
  • D
    All of the these.
9
Which of the following is an example of catabolism?
  • A
    Breakdown of detritus by microbial enzymes.
    Correct
  • B
    All of the these.
  • C
    Decrease in size of mountain.
  • D
    Breaking down of stones into smaller parts.
10
Assertion: If a predator is too efficient and overexploits its prey, then prey might become extinct. Reason: The predator will also become extinct for lack of food.
  • A
    Assertion is correct but reason is incorrect.
  • B
    Both assertion and reason are incorrect.
  • C
    Assertion is incorrect but reason is correct.
  • D
    Both assertion and reason are correct.
    Correct