Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

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


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12.

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


D.

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.


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13.

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


14.

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


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15.

An acromian process is characteristically found in the

  • pelvic girdle of mammals

  • skull of frog

  • pectoral girdle of mammals

  • sperm of mammals


16.

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

  • pinocytic vesicles

  • phagocytic vesicles

  • zymogen granules

  • micro-villi


17.

In contrast to annelids the platyhelminthes show

  • radial symmetry

  • presence of pseudocoel

  • bilateral symmetry

  • absence of body cavity


18.

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


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19.

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


20.

Secretin and cholecystokinin are digestive hormones. They are secreted in

  • oesophagus

  • ileum

  • duodenum

  • pyloric stomach


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