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NEET - October 2020 Previous Year Questions



NEET Biology Previous Year Questions - October 2020

Match the items in Column-I with those in Column-II :

Column-I Column-II
(A)Herbivores-Plants (I)Commensalism
(B)Mycorrhiza-Plants (II)Mutualism
(C)Sheep-Cattle (III)Predation
(D)Orchid-Tree (IV)Competition

[class-xii ]

  • (A)-(IV), (B)-(II), (C)-(I), (D)-(III)
  • (A)-(III), (B)-(II), (C)-(IV), (D)-(I)
  • (A)-(II), (B)-(I), (C)-(III), (D)-(IV)
  • (A)-(I), (B)-(III), (C)-(IV), (D)-(II)
  • Correct Option: B  [ (A)-(III), (B)-(II), (C)-(IV), (D)-(I) ]

    Remark:

The impact of immigration on population density is:

[class-xii ]

  • Negative
  • Both positive and negative
  • Neutralized by natality
  • Positive
  • Correct Option: D  [ Positive ]

    Remark:

According to Alexander von Humboldt:

[class-xii ]

  • Species richness decreases with increasing area of exploration
  • Species richness increases with increasing area, but only up to limit
  • There is no relationship between species richness and area explored.
  • Species richness goes on increasing with increasing area of exploration
  • Correct Option: B  [ Species richness increases with increasing area, but only up to limit ]

    Remark:

The rate of decomposition is faster in the ecosystem due to following factors except:

[class-xii ]

  • Detritus rich in sugars
  • Warm and moist environment
  • Presence of aerobic soil microbes
  • Detritus richer in lignin and chitin
  • Correct Option: D  [ Detritus richer in lignin and chitin ]

    Remark:

Which of the following statements is incorrect?

[class-xii ]

  • Biomass decreases from first to fourth trophic level
  • Energy content gradually increases from first to fourth trophic level
  • Number of individuals decreases from first trophic level to fourth trophic level
  • Energy content gradually decreases from first to fourth trophic level
  • Correct Option: B  [ Energy content gradually increases from first to fourth trophic level ]

    Remark:

Which of the following statements is incorrect regarding the phosphorus cycle?

[class-xii ]

  • Phosphates are the major form of phosphorus reservoir
  • Phosphorus solubilising bacteria facilitate the release of phosphorus from organic remains
  • There is appreciable respiratory release of phosphorus into atmosphere
  • It is sedimentary cycle
  • Correct Option: C  [ There is appreciable respiratory release of phosphorus into atmosphere ]

    Remark:

In the following in each set a conservation approach and an example of method of conservation are given:
A. In situ conservation - Biosphere Reserve
B. Ex situ conservation - Sacred groves
C. In situ conservation - Seed bank
D. Ex situ conservation - Cryopreservation
Select the option with correct match of approach and method:

[class-xii ]

  • (A) and (C)
  • (A) and (D)
  • (B) and (D)
  • (A) and (B)
  • Correct Option: B  [ (A) and (D) ]

    Remark:

Air (Prevention and Control of Pollution) Act was amended in 1987 to include among pollutants:

[class-xii ]

  • Vehicular exhaust
  • Allergy causing pollen
  • Noise
  • Particulates of size 2.5 micrometer or below
  • Correct Option: C  [ Noise ]

    Remark:

For the commercial and industrial production of Citric Acid, which of the following microbes is used?

[class-xii ]

  • Aspergillus niger
  • Lactobacillus sp
  • Saccharomyces cerevisiae
  • Clostridium butylicum
  • Correct Option: A  [ Aspergillus niger ]

    Remark:

Spooling is:

[class-xii ]

  • Amplification of DNA
  • Cutting of separated DNA bands from the agarose gel
  • Transfer of separated DNA fragments to synthetic membranes
  • Collection of isolated DNA
  • Correct Option: D  [ Collection of isolated DNA ]

    Remark: