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NEET Botany MCQs: Class-XI and Class-XII



NEET Botany MCQs: Class-XI and Class-XII

Dissolution of the synaptonemal complex occurs during:

[class-xi ]

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

    Remark:

Match the following with respect to meiosis :

(A)Zygotene (I)Terminalization
(B)Pachytene (II)Chiasmata
(C)Diplotene (III)Crossing over
(D)Diakinesis (IV)Synapsis
Select the correct option from the following :

[class-xi ]

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

    Remark:

The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is:

[class-xi ]

  • Transpiration
  • Root pressure
  • Imbibition
  • Plasmolysis
    • Correct Option: B  [ Root pressure ]

    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:

Match the following concerning essential elements and their functions in plants:

(A)Iron (I)Photolysis of water
(B)Zinc (II)Pollen germination
(C)Boron (III)Required for chlorophyll biosynthesis
(D)Manganese (IV)IAA biosynthesis
Select the correct option:

[class-xi ]

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

    Remark:

The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are:

[class-xi ]

  • Ammonia alone
  • Nitrate alone
  • Ammonia and oxygen
  • Ammonia and hydrogen
    • Correct Option: D  [ Ammonia and hydrogen ]

    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:

In light reaction, plastoquinone facilitates the transfer of electrons from:

[class-xi ]

  • PS-II to Cytb6f complex
  • Cytb6f complex to PS-I
  • PS-I to NADP+
  • PS-I to ATP synthase
    • Correct Option: A  [ PS-II to Cytb6f complex ]

    Remark:

The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of:

[class-xi ]

  • 2 molecules of 3-C compound
  • 1 molecule of 3-C compound
  • 1 molecule of 6-C compound
  • 1 molecule of 4-C compound and 1 molecule of 2-C compound
    • Correct Option: B  [ 1 molecule of 3-C compound ]

    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:
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