NEET BIOLOGY PYQ 20 MCQS TEST WITH ANSWERS 27 JULY

Ecology MCQ Test (Q21 - Q30)

Q21. The rate at which new tissues are formed in producers is the ecosystem's -

Net primary productivity
Gross primary productivity
Net secondary productivity
Gross secondary productivity

Q22. How much amount of light is used in the production process by plants?

1 to 5%
5% to 10%
20 to 40%
More than 70%

Q23. The importance of ecosystem maintenance lies in -

Cycling of materials
Flow of energy
Both of the above
None of these

Q24. The amount of energy utilized by herbivores from the plants is -

5%
10%
50%
90%

Q25. The percentage of net primary production of total light intake is -

10%
0.8 - 4%
10 - 20%
15%

Q26. The flow of materials and energy in an ecosystem is respectively -

Cyclic only
Linear only
Linear and cyclic
Cyclic and linear

Q27. Mark the incorrect statement with reference to carbon cycle -

Lime rocks contribute to CO₂ of water
Atmospheric CO₂ gets dissolved in water
CO₂ is returned by combustion of fuel
75% of total carbon lies in geological component

Q28. Major reservoir of carbon in biosphere lies in -

Atmosphere
Lithosphere
Hydrosphere
All of these

Q29. Biogeochemical cycling means -

Cycling of nutrients in an ecosystem
Cycling of water
Cycling of energy in an ecosystem
Cycling of gases between plants and the atmosphere

Q30. The least productive ecosystem is -

Coastal seas
Very deep lakes
Grasslands
Moist forests

Ecology MCQ Test (Q51-Q60)

Q51. The study of fresh water ecology is -

Hydrology
Ecology
Limnology
Geology

Q52. The place where fresh water joins the salt water is called as -

Island
Lagoon
Beach
Estuary

Q53. The word standing crop in ecosystem refers to -

Living components
Non-living components
Both living and non-living components
None of the above

Q54. The pyramid of energy in any ecosystem is-

Always upright
May be upright
Always inverted
None of the above

Q55. Which organisms can convert ammonium or nitrates into amino acids?

Scavengers
Producers
Primary consumers
Primary detritivores

Q56. One of the following is a true micro-ecosystem

One litre of pond water in an air tight flask
One litre of tap water with cotton plug
Ten litre of boiled pond water
One litre of pond water with gas exchange tube

Q57. The decomposers in an ecosystem constitute the trophic level -

T1
T3
T5
T4

Q58. If all the green plants disappeared from the earth -

All animals will die
Only herbivores will die
Only carnivores will die
Chemosynthetic bacteria will feed all

Q59. The bacteria which attack dead animals are -

Primary producers
Herbivores
Tertiary consumers
Decomposers

Q60. The number of producers and consumers is controlled by -

Feed back mechanism
Food chain mechanism
Productivity control
Any of these