Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

31.

Assertion: S.A. node induces excitatory impulses in heart.

Reason: S.A. node is self excitatory.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


32.

Assertion: Organ of Corti rests on tectorial membrane.

Reason: It helps to maintain equilibrium of body

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


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33.

Tendon and ligament are example of

  • dense regular connective tissue-

  • dense irregular connective tissue

  • loose connective tissue 

  • specialised connective tissue.


A.

dense regular connective tissue-

Fibres and fibroblasts are compactly packed in the dense connective tissues. Orientation of fibres show a regular or irregular pattern and are called dense regular and dense irregular tissues. In the dense regular connective tissues, the collagen fibres are present in rows between many parallel bundles of fibres. Tendons, which attach skeletal muscles to bones and ligaments which attach one bone to another are exam pies of this tissue.


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34.

If medulla oblongata is destroyed then which of the following functions will be effected

  • No thermoregulation

  • No vision

  • No memory

  • No response when pricked with needle


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35.

Which of the following statements is correct ?
1. Common cold- Droplet Infection.
2. Typhoid - Contaminated food & water.
3. AIDS- Shaking hands.
4. Ringworm - Using infected towels.

  • 1 and 2

  • 3 and 4

  • 1 and 3

  • 1,2 and 4


36.

Which of the following statements is correct

  • Catalytic converter can separate particulate matter of diameter less than 2.5 micrometers.

  • Histones are acidic in nature that forms core for DNA packaging.

  • Lactobacillus is not present in dough used in idli formation.

  • Template with polarity 5' 3' has continuous DNA replication.


37.

Which of the following statements is correct

  • Lion and leopard show convergent evolution.

  • Cryptic camouflage is seen in Biston betularia

  • Natural selection is responsible for extinction of dinosaurs.

  • Homo habilis and Homo erectus are closely related.


38.

What is the source of EcoRI

  • Escherichia coli R I

  • Escherichia coli R I 13

  • Escherichia coli R Y 13

  • Escherichia coli RX 13


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39.

First clinical gene therapy was given in 1992 to a 4 years old girl for

  • adenine deficiency

  • growth deficiency

  • adenosine deaminase deficiency

  • adenosine deficiency


40.

What are labelled phases A, B and C in given sigmoidal growth curve.

  •          A           B           C
    stationery Log Lag
  •          A           B           C
    Lag stationery Log
  •          A           B           C
    Log Lag stationery
  •          A           B           C
    Lag Log stationery

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