Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

31.

A bryophyte which harbours a nitrogen fixing blue-green alga in its thallus is :

  • Pogonatum

  • Riccia

  • Marchantia

  • Anthoceros


32.

Which of the following is not a co-enzyme?

  • NAD

  • NADP

  • FAD

  • ATP


33.

Chiasmata are most appropriately observed in meiosis during :

  • diakinesis

  • diplotene

  • metaphase II

  • pachytene


34.

In case of C4 plants the acceptor of CO2 is-

  • Phosphoglyceraldehyde

  • Ribulose monophosphate

  • Phosphoenol pyruvate

  • Ribulose diphosphate


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35.

Good soil is :

  • which holds whole of the water that enters into it

  • which allows percolating the water slowly from it

  • which allows water to pass very quickly from it

  • which allows limited amount of water to retain into it


36.

A metal ion involved in stomatal regulation is :

  • iron

  • potassium

  • zinc

  • magnesium


37.

Starch is insoluble in water, yet it is accumulated in large quantities in potato tuber because :

  • it is useful for storage

  • tubers respire slowly

  • starch is synthesized in tubers

  • translocated sucrose is polymerized here


38.

The first step in dark reaction of photosynthesis is :

  • formation of ATP

  • ionization of water

  • attachment of CO2 to a pentose sugar

  • excitement of electron of chlorophyll by a photon of light


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39.

The circinate vemation is the characteristic feature of ferns. It refers to :

  • coiling of young leaves

  • arrangement of leaves on stem

  • attachment of sori on leaves

  • heterophilly


A.

coiling of young leaves

The fern leaf, differs from the true leaf (euphyll) of the flowering plants in its vernation, or manner of expanding from the bud. In most ferns, vernation is circinate; that is, the leaf unrolls from the tip, with the appearance of a fiddlehead, rather than expanding from a folded condition. Vernation refers to the growing of a new leaf; circinate refers to the arrangement of the leaf, which is  circular.


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40.

Gymnosperms are called naked seed plants because these lack :

  • cotyledon

  • endosperm

  • ovary wall

  • testa


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