Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Match the following Columns.

Column I Column II
A. Hyperthyroidism 1. Myxedema
B. Hyposecretion of glucocorticoids 2. Addison's disease
C. Hypothyroidism- I 3. Increased metabolic rate
D. Hyperparathyroidism

4. Cushing's syndrome

5. Kidney stone

  • A- 3; B- 2; C- 1; D- 5

  • A- 3; B- 4; C- 1; D- 2

  • A- 1; B- 4; C- 3; D- 2

  • A- 1; B- 2; C- 3; D- 5


A.

A- 3; B- 2; C- 1; D- 5

Column I Column II
A.  Hyperthyroidism 3. Increased metabolic rate
B. Hyposecretion of glucocorticoids 2. Addison's disease
C. Hypothyroidism- I 1. Myxedema
D. Hyperparathyroidism 5. Kidney stone

2.

Taenidia is the vital component of which system in human body?

  • Respiratory system

  • Digestive system

  • Excretory system

  • Reproductive system


A.

Respiratory system

Taenidia is the vital component respiratory system in human body. It is also known as intima. It is the inner spiral cuticular thickening of the tracheae. It prevents the tracheae from collapsing.


3.

Pick the reaction from the following, where a water molecule is removed and reduction of NAD+ does not occur in the reactions of respiration.

I. Succinic acid  Fumaric acid
II. Malic acid   Oxaloacetic acid
III. 2-phosphoglycerate  phosphoenol pyruvic acid
IV. Pyruvic acid  Acetyl Co-A

The correct answer is

  • I, IV

  • I, II

  • II, III

  • I, III


D.

I, III

I and III reactions in which water is removed, but NAD+ is not reduced.

(I) Succinic acid Fumaric acid

       NAD+          FADH+ + H2O

(III) 2- Phosphoglycerate 2- Phosphoenol pyruvic acid + H2O

The II and IV reaction occur in the following way:

(II) Malic acid Oxaloacetic acid

NAD+ + H2O + NADH

(IV) Pyruvic acid Acetyl Co- A

          NAD+       NAD+ + CO2 + H2


4.

Which one from those given below represents the position of nitrogen in the 9-membered double rings of purines?

  • 2, 4, 6 and 8

  • 1, 3, 7 and 9

  • 1, 4, 8 and 9

  • 3, 5, 7 and 8


B.

1, 3, 7 and 9

Purines are 9-membered double rings with nitrogen at 1, 3, 7 and 9 positions. DNA has two types of purines namely Adenine (A) and Guanine (G).


5.

Myelin sheaths

  • are abundant in nervous system of non- vertebrates

  • consists largely of lipids

  • has a low electric resistance

  • allows the continous conduction of impulse


B.

consists largely of lipids

Myelin sheaths consists largely of lipids and has a high electrical resistance. These are abundant in vertebrates and allows the saltatory conduction of impulse.


6.

The most common type of ovule found in angiosperms is

  • Anatropous ovule

  • Atropous ovule

  • Campylotropous ovule

  • Hemitropous ovule


A.

Anatropous ovule

Anatropous ovule is a completely inverted ovule turned back 180 degrees on its stalk. It is the most common type of ovule in angiosperms.

Campylotropous ovule refers to the body of the ovule that is curved or bent round so that the micropyle and chalaza so not lie in the same straight line.

Hemitropous ovule refers to the body of the ovule is placed transversely at right angles to the funicle. The micropyle and chalaza lie in one straight line.


7.

Choose the correct statements with regard to human respiration.

I. Inspiration is facilitated by the contraction of phrenic and internal intercostal muscles.

II. Healthy human can inhale or exhale about 2000 to 3000 mL of air per minute.

III. Functional residual capacity represent the volume of left out air in lungs after expiration.

IV. Total lung capacity is the total volume of air that can be accomodated in the lung after forced inspiration.

The correct answer is

  • I, III

  • II, IV

  • III, IV

  • I, II


C.

III, IV

Statement III and IV are correct and statement I and II can be corrected as:-

I. Inspiration is facilitated by the contraction of diaphragm and contraction of external intercostal muscles.

II. Healthy humans can inhale 6000 to 8000 mL of air per minute.


8.

The largest type of nematocysts in Hydra is

  • Holotrichous isorhizas

  • Atrichous isorhizas

  • Desmonemes

  • Stenoteles


D.

Stenoteles

Stenoteles or penetrants are the largest type of nematocysts in Hydra. The thread tube is open at the end. When discharged, it release thread tube by which a poisnous fluid, hypotoxin is injected paralysing the prey.


9.

Pacinian corpuscles found in the skin are sensitive to

  • touch

  • pressure

  • temperature (hot and cold)

  • vibrations


D.

vibrations

Pacinian corpuscles are found in the skin, joints, tendons, muscles and gut area and consist of the endings of a single neuron surrounded by many layers of connective tissue. These receptors respond to pressure.


10.

When a red blood cell loses water by osmosis the shrinking of the cell volume leads to crinkling of the plasma membrane, called

  • Flacidity

  • Bursting

  • Crenation

  • Tonicity


C.

Crenation

When the external water potential is more negative than that of the cell, the cell lose water by osmosis. Such phenomenon in red blood cell is called crenation.

Flaccid cell in botany, is a cell in which the plasma membrane is not pressed tightly against the cell wall.

Bursting of cell occurs due to an osmotic imbalance that has caused excess water to diffuse into the cell.

Tonicity is a measure of the effective osmotic pressure gradient.