Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

71.

Bacterial endotoxin is

  • A toxic protein that stays inside the bacterial cell

  • A toxic protein that is excreted into the medium

  • Lipopolysaccharide located on the surface of the bacteria

  • None of the above


72.

Endosperm of gymnosperms is

  • Haploid

  • Tetraploid

  • Diploid

  • None of these


73.

Agar-Agar is produced by

  • Fungi

  • Alage

  • Bacteria

  • Blue-green algae


74.

In DNA, when AGCT occurs, their association is as per which of the following pair

  • A-G, C-T

  • A-T, G-C

  • A-C, G-T, A-C, E-T

  • All of these


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75.

A segment of DNA has 120 adenine and 120 cytosine bases. The total number of nucleotides present in the segment is

  • 60

  • 240

  • 120

  • 480


D.

480

According to Charagff's rules, the amount of adenine is always equal to that of thymine, and the amount of guanine is always equal to that of cytosine.

A = T(120)
G = C(120)

The total number of nucleotides would be 120 x 4 = 480


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76.

Pebrine is a disease of

  • Fish

  • Honey Bee

  • Silk Worm

  • lac insect


77.

Factor govering the earth surface is

  • Topographic

  • Edaphic

  • Temperature

  • Biotic


78.

The direction of energy flow is

  •  Producers → Herbivores → Decomposers → Omnivores

  • Producers → Carnivore → Herbivores → Decomposes

  • Decomposers → Carnivores → Herbivores → Producers

  • Producers → Herbivores → Carnivores → Decomposers


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79.

If the Bengal tiger become extinct

  • Hyenas and wolves will become scarce

  • Its gene pool will be lost forever

  • The wild areas will be safe for man and domestic

  • The population of beautiful animals like deer will get stabilised


80.

Biological treatment of water pollution is done with the help of

  • Fungi

  • Lichen

  • Phytoplanktons

  • None of the above


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