Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

21.

Which one out of (a) to (d) given below correctly represents the structural formula of the basic amino acid?


22.

Given below is a schematic break-up of the phases/stages of cell cycle. Which one of the following is the correct indication of the stage/ phase in the cell cycle?

  • C-karyokinesis

  • S-synthetic phase

  • A-cytokinesis

  • B-metaphase


23.

Which one of the following structural formula of two organic compounds is correctly identified along with its related function?

  • B-uracil – a component of DNA

  • A-triglyceride – major source of energy

  • A-lecithin – a component of cell membrane

  • B-adenine – a nucleotide that makes up nucleic


24.

In photosynthesis carbon dioxide is converted to carbohydrates. It is a process.

  • Reductive

  • Oxidative

  • Catabolic and exergonic

  • None of the above


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25.

Which of the following is not an auxin?

  • IM

  • IBA

  • Zeatin

  • NM


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26.

Which of the following properties is shown by cytokinins?

  • Delay leaf senescence

  • Cause leaf abscission

  • Promote seed dormancy

  • Promote stornatal closing


B.

Cause leaf abscission

Cytokinin is a plant growth hormone, which is mostly synthesised in the roots. Cytokinin delays leaf senescence.


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27.

Which of the following characteristics is are exhibited by C4 -plants?

I. Kranz anatomy.
II. The first product of photosynthesis is oxaloacetic acid.
III. Both PEP carboxylates and ribulose biphosphate carboxylate act as carboxylating enzymes.

The correct option is

  • I and III, but not ll

  • I and II, but not III

  • II and III, but not I

  • ll and III


28.

Which of the following plant keeps its stomata open during night and closed during the day?

  • Orchid

  • Cactus

  • Tea

  • Wheat


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29.

Genetic dwarfism can be overcome by

  • Gibberellin

  • Ethylene

  • Auxin

  • ABA


30.

Hormone inducing fruit ripening is

  • Cytokinin

  • Ethylene

  • Aabscissic acid

  • Gibberellic acid


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