NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


Protein synthesis in an animal cell occurs

  • only on the ribosomes present in cytosol

  • on ribosomes present in cytoplasm as well as in mitochondria

  • only on ribosomes attached to the nuclear envelope and endoplasmic reticulum

  • on ribosomes present in the nucleolus as well as in cytoplasm


on ribosomes present in cytoplasm as well as in mitochondria

Protein synthesis takes place in ribosomes. In an eukaryotic cell, ribosomes are present in cytoplasm, mitochondria and chloroplasts. Therefore, protein synthesis takes place in cytoplasm, mitochondria and chloroplasts.


One of the examples of the action of the autonomous nervous system is

  • knee-jerk response

  • pupillary reflex

  • swallowing of food

  • peristalsis of the intestines


peristalsis of the intestines

Peristalsis of intestine is related with Autonomous Nervous System whereas knee- jerk response, pupillary reflex and swallowing of food are related to reflex action.


Haemophilia is more commonly seen in human males than in human females because

  • this disease is due to an X- linked dominant mutation

  • a greater proportion of girls die in infancy

  • this disease is due to an X- linked recessive mutation

  • this disease is due to a Y- linked recessive mutation


this disease is due to an X- linked recessive mutation

Haemophilia is a hereditary (recessive X- linked) disease caused due to fault in genes, controlling the factors VIII and IX, on X chromosome. 

Males have one X and Y chromosome each. Y chromosome does not carry any gene for blood clotting. Therefore, this condition is usually seen in males as they carry only one faulty X chromosome.

Females are generally the carrier of the disease as in females, two faulty X- chroromsomes are needed to cause the disease.


Parkinson's disease (characterized by tremors and progressive rigidity of limbs) is caused by degeneration of brain neurons that are involved in movement control and make use of neurotransmitter

  • acetylcholine

  • norepinephrine

  • dopamine

  • GABA



A dopamine deficiency is due to low level of dopamine in the body. It leads to a problem with the receptors in the brain and develops into Parkinson's disease or depression.

Acetylcholine is a major neurotransmitter responsible for memory and learning. It can lead to diseases such as dementia and Alzheimer's.

Norepinephrine promotes arousal and alertness. Increased levels of norepinephrine leads to excessive activity of sympathetic nervous system, and it can further lead to obesity, metabolic syndrome and high blood pressure.

GABA or Gamma- Amino Butyric Acid deficiency can lead to depression, anxiety, insomnia etc.


Secretin and cholecystokinin are digestive hormones. They are secreted in

  • oesophagus

  • ileum

  • duodenum

  • pyloric stomach



Secretin and Cholecystokinin (CCK) are two main Gastrointestinal (GI) hormones secreted in duodenum of alimentary canal. 

CCK stimulates gall bladder contraction and thus increases the flow of bile salts into the intestine. Secretin stimulates the release of an alkaline pancreatic fluid that neutralizes stomach acid as it enters the intestine.


Which of the following pairs is correctly matched?

  • Cartilaginous joint - Skull bones

  • Hinge joint - Between vertebrae

  • Fibrous joint - Between phalanges

  • Gliding joint - Between zygapophyses of the successive vertebrae


Gliding joint - Between zygapophyses of the successive vertebrae

Gliding joint is present between zygapophyses of the successive vertebrae.


The ability of the venus flytrap to capture insects is due to

  • chemical stimulation by the prey

  • a passive process requiring no special ability on the part of the plant

  • specialized "muscle-like" cells

  • rapid turgor pressure changes


rapid turgor pressure changes

Insectivorous plants grow in water logged, swampy soils, deficient in nitrogenous compounds. These plants obtain their nitrogen compounds from the insects. Therefore, known as semi- autotrophic or semi- heterotrophic plants.

Dionea or venus fly trp is an insectivorous plant. They have winged petiole leaves and two toothed jaws. Upper surface of each jaw consists of long shaped hair or bristles. The hair are very sensitive to touch stimulus. Therefore, when an insect touches these hair, the stimulus causes rapid turgor pressure which results in closing of the leaf.


An acromian process is characteristically found in the

  • pelvic girdle of mammals

  • skull of frog

  • pectoral girdle of mammals

  • sperm of mammals


pectoral girdle of mammals

Acromion process is a bony process on the scapula. Scapula is a large triangular flat bone situated in the dorsal part of the thorax between the second and seventh ribs. 

The acromion is a continuation of the scapular spine, and hooks over anteriorly. It articulates with the clavicle to form the acromioclavicular joint.


Epithelial cells ofthe intestine involved in food absorption have on their surface

  • pinocytic vesicles

  • phagocytic vesicles

  • zymogen granules

  • micro-villi



The mucosa and sub-mucosa of small intestine are thrown into folds. Surfaces of these folds is covered by fine, fingerlike projections of the epithelium. These projections are called villi. In addition, the epithelial cells of the villi are covered on their exposed surface by cytoplasmic projections called microvilli.


In contrast to annelids the platyhelminthes show

  • radial symmetry

  • presence of pseudocoel

  • bilateral symmetry

  • absence of body cavity


absence of body cavity

Platyhelminthes does not have coelomic or pseudocoelomic cavity for digestion of food as found in higher organisms. These group of organisms are known to obtain their digested food directly.