Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Which insect is useful for us ?

  • Periplaneta

  • Musca

  • Bombyx

  • Mosquitoes


C.

Bombyx

Bombay mori is a silk producing insect which is reared on mulberry leaves for commercial production of silk. Whereas Mosquito, Musca and Periplanata are harmful Arthropodes.


12.

A haemophilic woman marries a normal man then:

  • all the children will be normal

  • all the sons will be haemophilic

  • all the girls will be haemophilic

  • half girls will be haemophilic


B.

all the sons will be haemophilic

Thus, all sons will be haemophilic.


13.

During staravation what will be sequence of ending of food stuffs?

  • Carbohydrate - Fat - Protein

  • Carbohydrate - Protein - Fat

  • Fat - Protein - Carbohydrate

  • Fat - Carbohydrate - Protein


A.

Carbohydrate - Fat - Protein

During starvation reserve carbohydrate is used up firstly by the body and after carbohydrate, fat is used as energy source and at last when both carbohydrate and fat are absent proteins are used as energy source. Therefore, the correct sequence is

Carbohydrate Fat Protein


14.

Husband has blood group A and wife has blood group B. What is the blood group of children ?

  • A

  • B

  • AB

  • All A, B, AB or O


D.

All A, B, AB or O

If husband has blood group A and wife has blood group B, the blood group of children could be A, B, AB or O. It is explained in the following figure:


15.

Number of cranial nerves in frog :

  • 10 pairs

  • 9 pairs

  • 12 pairs

  • none of the above


A.

10 pairs

Ten pairs of cranial nerves are present in anamniotes such as fishes and Amphibians such as frog. Twelve pairs of cranial nerves are present in reptiles, birds and mammals including rabbit and humans.


16.

Bowman's capsule is found in :

  • glomerulus

  • uriniferous tubule

  • nephron

  • malpighian capsule


D.

malpighian capsule

Human kidney consists of about one million nephrons. Each nephron in made up of two main parts i.e., malphigian body and reval tubule. Malpighain body comprises a cup shaped Bowman's capsule and a mesh work of blood capillaries, the glomerulus.


17.

Which of the following hormone stimulates the gastric secretion ?

  • Enterogastrone

  • Gastrin

  • CCK-PZ

  • Villikinin


B.

Gastrin

Gastrin stimulates the gastric secretion. It is released from the gastric glands.

Enterogasterone is secreted by the duodenal epithelium. It inhibits the secretion of gastric juice and slows gastric contraction.

CCZ- PZ or Cholecystokinin pancreozymin is secreted by entire small intestine. It stimulates the gall bladder to release bile and the pancreas as to release enzymes in the pancreatic juice.

Villikinin accilerates the movement of intestinal villi.


18.

Striped muscles are characterised by

  • syncytial

  • spindle shape

  • uninucleate

  • none of the above


A.

syncytial

Striated muscle or skeletal muscle or voluntary muscle or striped muscle fibre is an elongated cell surrounded externally by sarcolemma just beneath the sarcolemma in each fibre many nuclei occur at irregualr intervals. Thus these fibres are multinucleated or syncytial in nature.


19.

If drosal nerve of spinal cord is broken down then its effect is :

  • no impulse is transmitted

  • impulse is transmitted but slowly

  • impulse is trasmitted fast

  • no effect on impulse


A.

no impulse is transmitted

Spinal nerve is a mixed nerve which arises from gray matter of spinal cord. It has two roots. The dorsal root is sensory and the ventral root is motor. If dorsal nerve of spinal cord is broken down, the pathway of nerve will break so, no impulse will be transmitted.


20.

How many ATP are formed by oxidation of one glucose molecular in liver cells ?

  • 36

  • 38

  • 2

  • 8


B.

38

In liver cells and prokaryotic cells 38 ATP are produced by the complete oxidation of one molecule of glucose.

During glycolysis:

2 ATP directly            - 2 ATP

2 molecules of NADH - 6 ATP

During Pyruvic to Acetyl CoA:

2 molecules of NADH - 6 ATP

Pyruvic acid to Acetyl CoA:

6 molecules of NADH - 18 ATP

2 molecules of FADH - 4 ATP

2 molecules of GTP - 2 ATP

Total number of ATP is 38. Therefore, 38 ATP are produced.