Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Gametes formation in animals is found in

  • ovaries

  • gonads

  • gall bladder

  • testes


B.

gonads

Gametogenesis is the process of forming gametes from diploid cells of the germ line. In animals, it takes place in gonads.


52.

In lysogenic phase which of the following takes place?

  • Phage DNA integrated with host genome and does not multiplied

  • Phage DNA does not integrate with host genome

  • Phage DNA integrates with host genome and bacterial cell does not lyse

  • Phage DNA integrated with host DNA and multiplied


D.

Phage DNA integrated with host DNA and multiplied

In lysogencic cyclic, phage DNA integrate with host DNA and multiplies.


53.

Mycoplasma is resistant for

  • penicillin

  • tetracycline

  • streptomycin

  • All of the above


A.

penicillin

Mycoplasma is resistant to antibiotic penicillin, which act on cell wall and inhibited by antibiotics, which act on metabolic pathways like tetracycline.


54.

Double fertilisation is the

  • fertilisation of two eggs in an embryo sac

  • fusion of one male gamete with the egg cell and another male gamete with the secondary nuclei

  • fusion of two male gametes with two polar nuclei

  • fusion of one male gamete with secondary nucleus


B.

fusion of one male gamete with the egg cell and another male gamete with the secondary nuclei

Double fertilization is the fusion of one male gamete with the egg cell and another male gamete with the secondary nuclei. It was discoverd by Nawaschin in 1898.


55.

The RNA found in eukaryotic ribosomes are

  • 5 S and 16 S RNA

  • 5 S, 16 S, 18 S RNA

  • 23S, 16 S, RNA

  • 5 S and 28 S RNA


D.

5 S and 28 S RNA

Eukaryotic ribosomes have two unequal subunits, small subunit (40S) and large subunit (60S). Large subunit consists of 28S rRNA and 5S rRNA. It also consists of 5.8S rRNA. Small subunit consists of 18S rRNA.


56.

The biomass pyramid of forest ecosystem is

  • linear

  • inverted

  • tetra angle

  • upright


D.

upright

Pyramid of biomass for terrestrial ecosystems such as grasslands or forests,  the biomass generally decreases at each higher trophic level from plants via herbivores to carnivores. Thus, in terrestrial ecosystems, the Pyramid of Biomass is upright.


57.

The development ofsporangium in Pteridium is

  • a leptosporangiate type

  • an eusporangiate type

  • Both (a) and (b)

  • None of the above


A.

a leptosporangiate type

In leptosporangiate type development a sporangium develops from a 'single initial cell' like in Pteridium, Pteris and Marsilea, etc.


58.

After pollination the number of chromosome in egg will be

  • n

  • 2n

  • 3n

  • None of these


B.

2n

After pollination, the number of chromosomes in fertilized egg will be 2n.


59.

Hydra is

  • herbivorous

  • more developed

  • carnivorous

  • omnivorous


A.

herbivorous

Hydra are carnivorous and feed mainly on small crustaceans like water fleas (Daphnia) and small worms.


60.

The reduction division in chromosomes takes place in

  • pollen grains

  • tapetum

  • megaspore cell

  • megaspore mother cell


D.

megaspore mother cell

The reduction division in chromosome occurs in 'megaspore mother cell'.