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NEET - October 2020 Previous Year Questions



NEET Biology Previous Year Questions - October 2020

Match the following:

List-I List-II
(A)Aquaporin (I)Amide
(B)Asparagine (II)Polysaccharide
(C)Abscisic acid (III)Polypeptide
(D)Chitin (IV)Carotenoids
Select the correct option:

[class-xi ]

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

    Remark:

Attachment of spindle fibers to kinetochores of chromosomes becomes evident in:

[class-xi ]

  • Anaphase
  • Telophase
  • Prophase
  • Metaphase
  • Correct Option: D  [ Metaphase ]

    Remark:

In a mitotic cycle, the correct sequence of phases is:

[class-xi ]

  • S, G1, G2, M
  • G1, S, G2, M
  • M, G1, G2, S
  • G1, G2, S, M
  • Correct Option: B  [ G1, S, G2, M ]

    Remark:

Match the following events that occur in their respective phases of cell cycle and select the correct option:

(A)G1 phase (I)Cell grows and organelle duplication
(B)S phase (II)DNA replication and chromosome duplication
(C)G2 phase (III)Cytoplasmic growth
(D)Metaphase in M-phase (IV)Alignment of chromosomes

[class-xi ]

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

    Remark:

During Meiosis 1, in which stage synapsis takes place?

[class-xi ]

  • Pachytene
  • Zygotene
  • Diplotene
  • Leptotene
  • Correct Option: B  [ Zygotene ]

    Remark:

Select the incorrect statement.

[class-xi ]

  • Transport of molecules in phloem can be bidirectional.
  • Movement of minerals in xylem is unidirectional.
  • Unloading of sucrose at sink does not involve the utilization of ATP.
  • Elements most easily mobilized in plants from one region to another are: phosphorus, sulphur, nitrogen and potassium.
  • Correct Option: C  [ Unloading of sucrose at sink does not involve the utilization of ATP. ]

    Remark:

In Glycine max, the product of biological nitrogen fixation is transported from the root nodules to other parts as:

[class-xi ]

  • Ammonia
  • Glutamate
  • Nitrates
  • Ureides
  • Correct Option: D  [ Ureides ]

    Remark:

Which of the following statements is incorrect?

[class-xi ]

  • RuBisCO is a bifunctional enzyme
  • In C4 plants, the site of RuBisCO activity is mesophyll cell
  • The substrate molecule for RuBisCO activity is a 5-carbon compound
  • RuBisCO action requires ATP and NADPH
  • Correct Option: B  [ In C4 plants, the site of RuBisCO activity is mesophyll cell ]

    Remark:

During non-cyclic photophosphorylation, when electrons are lost from the reaction centre at PS II, what is the source which replaces these electrons?

[class-xi ]

  • Oxygen
  • Water
  • Carbon dioxide
  • Light
  • Correct Option: B  [ Water ]

    Remark:

Pyruvate dehydrogenase activity during aerobic respiration requires:

[class-xi ]

  • Calcium
  • Iron
  • Cobalt
  • Magnesium
  • Correct Option: D  [ Magnesium ]

    Remark: