Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

21.

A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rate of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant?

  • C4

  • CAM

  • Nitogen-fixer

  • Nitogen-fixer


A.

C4

C4 plants show very little photorespiration and better utilisation of water. 

1965 Views

22.

A complex of ribosomes attached to a single strand of RNA is known as 

  • Polymer

  • Polypeptide

  • Okazaki's fragment

  • Okazaki's fragment


D.

Okazaki's fragment

A chain of ribosomes attaches to a single mRNA is called polysome or polyribosomes.

2077 Views

23.

A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. there is no formation of cell plate and thus the cell is containing more number of chromosomes as compares to other dividing cells. This would result in

  • polyploidy

  • somaclonal variation

  • polyteny

  • polyteny


A.

polyploidy

Polyploid cells have a chromosome number that is more than double the haploid number.

1746 Views

24.

The Avena curvature is used for bioassay of

  • GA3

  • IAA

  • Ethylene

  • Ethylene


B.

IAA

1950 Views

25.

Which of the following features is not present in the phylum-Arthropoda?

  • Metameric segmentation

  • Parapodia

  • Jointed appendages

  • Jointed appendages


B.

Parapodia

Parapodia are present in annelids.

2020 Views

26.

Which of the following features is not present in Periplaneta americana?

  • Indeterminate and radical cleavage during embryonic development

  • Exoskeleton composed of N-acetylglucosamine

  • Metamerically segmented body

  • Metamerically segmented body


A.

Indeterminate and radical cleavage during embryonic development

Cockroach has determinate cleavage during emembryonic development and it develops into nymph, which is a fully developed cockroach.

2389 Views

27.

The amino acid, trytophan is the precussor for the synthesis of

  • thyroxine and tri-iodothryonine

  • estrogen and progesterone

  • cortisol and cortisone

  • cortisol and cortisone


D.

cortisol and cortisone

Melatonin and serotonin are derivatives of tryptophan amino acid.

2710 Views

28.

A typical fat molecule is made up of

  • One glycerol and three fatty acid molecules

  • One glycerol and one fatty acid moleule

  • Thre glycerol and three fatty acid molecules

  • Thre glycerol and three fatty acid molecules


A.

One glycerol and three fatty acid molecules

A typical fat molecule is a triglyceride formed by the esterification of one glycerol and three fatty acid molecules.

1922 Views

29.

Water-soluble pigments found in plant cell vacuoles are

  • chlorophylls

  • carotenoids

  • anthocyanins

  • anthocyanins


C.

anthocyanins

Anthocyanins are water soluble pigments and appear red, purple depending on pH. 

2040 Views

30.

One of the major components of cell wall of most fungi is

  • peptidoglycan

  • cellulose

  • hemicellulose

  • hemicellulose


D.

hemicellulose

Fungi cell wall is made of chitin. 

1596 Views