Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

21.

Which cell organelle is covered by only one unit membrane ?

  • Nucleus

  • Plastids

  • Mitochondria

  • Lysosome


22.

The S-phase of cell cycle is characterized by:

  • duplication of chromosome

  • shotening of chromosome

  • duplication of DNA

  • duplicatin of centriole


23.

Quiscent centre is present in :

  • root apex

  • shoot apex

  • parenchyma

  • collenchyma


24.

Cell membrane is made up of:

  • protein

  • cellulose

  • lipids

  • lipids, carbohydrates and protein


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25.

Core of chlorophyll is formed by

  • Fe

  • Mn

  • CH3

  • Mg


26.

Phytotron is :

  • a controlled condition chamber for tissue

  • leaf culture process

  • special culture of plants

  • root culture process


27.

Fruits are formed in :

  • Brassica

  • Fern

  • Cycas

  • Funaria


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28.

CO2 acceptor in CAM plants is in :

  • mesophyll cells

  • bundle sheath

  • both

  • none of the above


A.

mesophyll cells

CAM or Crassulacean Acid Metabolism  is found in succulent plants. In these plants CO2 is accepted in night via Phosphoenol pyruvate carboxylase enzyme in mesophyll cells.

During night, stomata open and CO2 is stored in vacuole in the form of malic acid. During day, it is decarboxylated and CO2 is transfered to ribulose 1,5 biphosphate (RuBP) of the calvin cycle within the same cell.


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29.

If centromere is the middle, the chromosome is called :

  • sub-metacentric

  • metacentric

  • acentric

  • telocentric


30.

Which hormone is responsible for mobilization of storage food during seed germination ?

  • Auxin

  • Gibberellin

  • Cytokinin

  • Ethylene


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