Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

31.

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

  • adenine deficiency

  • growth deficiency

  • adenosine deaminase deficiency

  • adenosine deficiency


C.

adenosine deaminase deficiency

Gene therapy is a procedure of introducing copies of a healthy gene to replace defective gene responsible for disease development. The first clinical gene transfer took place on 22nd May 1992 for correction of adenosine deaminase (ADA) enzyme deficiency.


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.


D.

If both assertion and reason are false.

The organ of Corti lies on the basilar membrane. It contains a series of electromechanically sensitive cells i.e. hair cells. They are the receptive end organs that generate nerve impulses in. response to sound vibrations. Thus, organ of Corti is actually the organ that perceives sound. Minute hairs project upward from hair cell and they are embedded in the tectorial membrane. Equilibrium of body is maintained with the help of semicircular canals, utricle and saccule of internal ear.


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.


34.

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.


B.

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

Sinu-auricular node or S-A node is located in the wall of the right auricle below the opening of the superior vena cava. The S-A node has unique property of self excitation, which enables it to act the "pacemaker" of the heart. It spontaneously initiates a wave of contraction which spreads over both the auricles more or less simultaneously along the muscle fibres that fan out from the pacemaker


35.

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.


B.

Cryptic camouflage is seen in Biston betularia

The peppered moth (Biston betularia) is a temperate species of night-flying moth. Peppered moth evolution is often used by educators as an example of natural selection. Peppered moths are cryptically camouflaged against their backgrounds when they rest on the tree trunk.


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.


B.

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

According to Central Pollution Control Board (CPCB), particulate size 2.5 micrometers or less in diameter (PM 2.5) are responsible for causing the greatest harm to human health. These fine particulates can be inhaled deep into the lungs and can cause breathing and respiratory symptoms, such as irritation, inflammations and damage to the lungs and premature deaths.


37.

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


D.

No response when pricked with needle

Medulla oblongata is part of the vertebrate brain stem, derived from the hindbrain, that is continuous with the spinal cord. Its function is to regulate the reflex responses controlling respiration, heart beat, blood pressure, and other involuntary processes. It gives rise to many of the cranial nerves.


38.

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

D.

         A           B           C
Lag Log stationery

When a graph is plotted taking into consideration time on one hand and growth rate on the other hand, a 'S' shaped curve is obtained. It is called "grand period of growth". This total growth period is divided into three stages.
(1) Initial lag phase
(2) Middle log phase
(3) Final stationary phase


39.

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


D.

1,2 and 4

Common cold can take place from one person to other as it is a communicable in nature. A healthy person can get infected by being in close vicinity of infected person when he/she sneezes, coughs, as the droplets generated by sneeze and cough contain infecting agents. Typhoid occurs by the intake of contaminated water & food. While ringworm is one of the skin disease which can transfer from one person to other by the use of infected towel & handkerchief. AIDS (Acquired lmmuno deficiency) does not occur or transfer by shaking hands.


40.

What is the source of EcoRI

  • Escherichia coli R I

  • Escherichia coli R I 13

  • Escherichia coli R Y 13

  • Escherichia coli RX 13


C.

Escherichia coli R Y 13

Eco R I is type II restriction endonuclease enzyme extracted from Eco R Y 13 bacteria. It can recognize and cleave 5'-GAATTC-3' palindromic sequence and is widely used in biotechnology experiments.