Nutrient Cycle Test

Nutrient Cycle

This is online test 01 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
Correct sequence for decomposition process is:
  • A
    fragmentation -> leaching -> catabolism -> mineralisation
    Correct
  • B
    fragmentation -> catabolism -> leaching -> mineralisation
  • C
    fragmentation -> leaching -> mineralisation -> humification
  • D
    leaching -> fragmentation -> humification -> mineralisation
2
When the main pool is located in the soil and rocks, that nutrient cycle is called:
  • A
    lithospheric
  • B
    sedimentary
    Correct
  • C
    gaseous
  • D
    terrestrial
3
The concept of ecological pyramids was developed by :
  • A
    RamdeoMisra
  • B
    Odum
  • C
    Lindemann
  • D
    Charles Elton
    Correct
4
Which of the following pyramid/s is/are inverted:
  • A
    pyramid of biomass in a grassland system
  • B
    pyramid of number in an aquatic system
  • C
    pyramid of number in a grassland system
  • D
    pyramid of biomass in an aquatic system
    Correct
5
Breakdown of detritus by microbial enzymes into simple forms is called :
  • A
    mineralization
  • B
    catabolism
    Correct
  • C
    fragmentation
  • D
    leaching
6
Conditions favouring decomposition are :
  • A
    low temperature and high humidity
  • B
    low temperature and low humidity
  • C
    high temperature and low humidity
  • D
    high temperature and high humidity
    Correct
7
Available organic matter for herbivores is represented by:
  • A
    Secondary productivity
  • B
    All the these
  • C
    NPP
    Correct
  • D
    GPP
8
Speed of decomposition will be:
  • A
    fast if detritus is rich in simple sugars
    Correct
  • B
    fast if detritus is rich in lignin
  • C
    slow if detritus lacks chitin
  • D
    slow if detritus contains water soluble substances like sugars
9
Correct decreasing order for rate of primary productivity on land will be :
  • A
    Tropical rainforests > Temperate forests > Savannah > Arid regions
    Correct
  • B
    Savannah > Temperate forests > Tropical rainforests > Arid regions
  • C
    Tropical rainforests >Savannah > Arid regions>Temperate forests
  • D
    Temperate forests > Tropical rainforests > Savannah > Arid regions
10
The more fundamental type of ecological pyramid showing the quantitative relationships of the standing crops will be :
  • A
    none of these
  • B
    ecological pyramid of biomass
    Correct
  • C
    ecological pyramid of energy
  • D
    ecological pyramid of number