Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

The oxygen toxicity is related with:

  • blood poisoning

  • collapse of alveolar walls

  • failure of ventilation of lungs

  • both 'a' and 'b'


C.

failure of ventilation of lungs

Oxygen toxicity develops when pure oxygen is breathed in for a prolonged period. This is formed due to progressive failure of ventilation of lungs.


12.

The important function of lymph is to :

  • transport oxygen to the brain

  • transport carbon dioxide to the lungs

  • return RBCs to the lymph nodes

  • return interstitial fluid to the blood


D.

return interstitial fluid to the blood

Lymph is the fluid present in lymphatic system. Its main function is to return interstitial fluid back to the blood. Interstitial fluid, also called extracellular fluid which is formed from blood due to various factor such as hydrostatic pressure, osmotic gradients etc.


13.

The leucocytes contain which of the following in large quantity ?

  • basophils

  • neutrophils

  • eosinophils

  • monocytes


B.

neutrophils

WBCs or White Blood Cells are known as leucocytes. These are of two types: Agranulocytes (30%) and granulocytes (70%).

Granulocytes are made in the bone marrow but by the cells different from those that make red blood cells. These are of three types: Neutrophils, Eosinophils and basophils.

Neutrophils constitute about 70% of the total number of granular WBCs. They squeeze between the cells of the capillary walls and intercellular spaces. They actively phagocytic phagocytic which engulf and digest disease causing bacteria.


14.

Which part of our body secreted the hormone secretin?

  • ileum

  • stomach

  • duodenum

  • oesophagus


C.

duodenum

Brunner's gland in duodenum secrete secretin under stimulus of acidic food coming from stomach.


15.

Carotene pigment is found in the cells of

  • dermis

  • epidermis

  • adipose cell

  • both 'b' and 'c


D.

both 'b' and 'c

Carotenoids are yellow, orange, reel or brown pigment. They are of two types carotenes and xanthophylls. Carotene is found in the cells of epidermis and adipose cells in the hypodermis. Carotenes are related to stains and former are yellow orange pigments.


16.

The lining of intestine and kidneys in humans is :

  • keratinized

  • brush border

  • ciliated

  • none of these


B.

brush border

Microvilli are finger like extensions of the cell surface membrane of animal cells such as epithelial tells in intestine and kidney's nephron. They can just be seen with a light microscope as the fringe across the top of cell is called as brush border. 


17.

Cardiac output is determined by:

  • heart rate

  • stroke volume

  • blood flow

  • both 'a' and 'b'


D.

both 'a' and 'b'

Cardiac output is the amount of blood flowing from the heart over a given period of time. It depends upon heart rate and stroke volume. They both are related to cardiac output.

Cradiac output = stroke volume x heart rate.


18.

Debove's membrane is a layer of :

  • muscular tissue

  • epithelial tissue

  • connective tissue

  • all of the above


C.

connective tissue

Debove's membrane layer is a layer between the epithelium and basement tissue of respiratory and intestinal epithelium. It is formed by connective tissues.


19.

Achilles tendon is associated with :

  • gluteus muscle

  • hamstring muscle

  • quadriceps muscle

  • gastrocnemius muscle


D.

gastrocnemius muscle

Achilles tendon is the strongest and thickest tendon in the body. It is a tough band of fibrous tissue that connects the calf muscles to the heel bone (calcaneus). Former is a large tendon atlower end of the gastrocnemius muscle, inserted into oscalcis.


20.

During inspiration, the diaphragm :

  • expands

  • shows no change

  • contracts and flattens

  • relaxes to become dome-saped


C.

contracts and flattens

Breathing or ventilation of the lungs is the process of filling the lung with atmospheric air and then emptying it. Inspiration is breathing in and expiration is breathing out. During inspiration, the diaphragm contracts putting backwords by partial flattening and increase the thoracic cavity lengthwise.