Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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21.

Which cell organelle is covered by only one unit membrane ?

  • Nucleus

  • Plastids

  • Mitochondria

  • Lysosome


D.

Lysosome

Nucleus, Plastids, and mitochondria are double membrane bound cell organelles whereas Lysosome is covered by single membrane.


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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


28.

CO2 acceptor in CAM plants is in :

  • mesophyll cells

  • bundle sheath

  • both

  • none of the above


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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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