NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


Microvilli of intestinal epithelium are similar in function with 

  • typhlosole in earthworm

  • hepatic caecae in cockroach

  • intestinal caecum in earthworm

  • Malpighian tubules in coackroach


typhlosole in earthworm

Microvilli increase the absorptive surface area. Typhlosolar region in earthworm is the middle region of the intestine that runs from 27th segment upto 23- 25 segments infront of the anus. When mid- dorsal wall of the intestine is thrown into a longitudinal fold, it is known as typhlosole. It increases the absorptive surface of the intestine.


What are Singer and Nicolson known for?

  • One-gene-one-enzyme hypothesis

  • Plasma membrane modifications

  • Fluid-mosaic model of plasma membrane

  • Structure of DNA


Fluid-mosaic model of plasma membrane

The most recent model of plasma membrane is fluid-mosaic model which was proposed by Singer and Nicolson in 1972. According to this model, the membrane does not have a uniform disposition of lipids and proteins but is instead a mosaic of the two. Further, the membrane is not solid but is quasifluid.


The taxon which includes related species is

  • class

  • order

  • family

  • genus



Genus comprises a group of related species which has more characters in common in comparison to species of other genera. Eg, potato and brinjal are two different species but both of them belongs to the genus Solanum.


Animals take phosphorus from

  • water

  • plants

  • rock

  • soil



Phosphorus is a major constituent of biological membranes, nucleic acids and cellular energy transfer systems. Many animals require this element to make shells, bones and teeth. The natural reservoir of phosphorus is rock. It is present in the form of phosphate. When rocks are weathered, minute amounts of these phosphates dissolve in soil solution and are absorbed by the roots of the plants. Herbivores and other animals obtain this element from plants.


The type of epithelial cells which line the inner surface of Fallopian tubes, bronchioles and bronchi are known as

  • squamous epithelium

  • ciliated epithelium

  • columnar epithelium

  • cubical epithelium


ciliated epithelium

The cells of ciliated epithelium consists of numerous delicate hair like outgrowths, called cilia. It lines most of the respiratory tract and Fallopian tubes. It is also present in the tympanic cavity of middle ear and auditory tube.

Squamous epithelium is made of a single thin layer of flattened cells with irregular boundaries. It is found in the walls of blood vessels and air sacs of lungs. 

Columnar epithelium is composed of a single layer of tall and slender cells. It is found in the lining of stomach and intestine.

Cuboidal epithelium is composed of a single layer of cube- like cells. It is found in the ducts of glands and tubular parts of nephrons in kidney.


What is the effect of GnRH produced by hypothalamus?

  • Stimulates the synthesis and secretion of androgens

  • Stimulates secretion of milk in mammary glands

  • Stimulates foetal ejection reflex

  • Stimulates synthesis of carbohydrates from non- carbohydrates in liver


Stimulates the synthesis and secretion of androgens

Gonadotropin Releasing Hormone (GnRH) is a releasing hormone. It stimulates the anterior lobe of the pituitary gland to secrete two gonadotropic hormones- FSH (Follicle Stimulating Hormone) and LH (Luteinising Hormone). 

In males, LH stimulates testosterone production from the interstitial cells of the testes (leydig cells). FSH stimulates testicular growth and enhances the production of an androgen- binding protein by the Sertoli cells, which are a component of the testicular tubule necessary for sustaining the maturing sperm cells.

In females, FSH stimulates the growth of ovarian follicles in the ovary before the release of an egg from one follicle at ovulation. It also increases oestradiol production. LH triggers ovulation and development of the corpus luteum.


Chemosensitive area of respiratory centre in medulla is affected by

  • less CO2 and H+ ions

  • less O2 and Hions

  • excess CO2 and H+ ions

  • excess O2 and Hions


excess CO2 and H+ ions

Respiratory rhythm centre is a specialised centre present in the medulla region of the brain responsible for its regulation. A chemosensitive area is situated adjacent to the rhythm centre which is highly sensitive to CO2 and H+ ions. Increase in these substances can activate this centre and in turn can signal the rhythm centre to make necessary adjustments in the respiratory process.


Cyclic photophosphorylation involves

  • PS I

  • PS II

  • PS I and PS II

  • P680



Cyclic Photophosphorylation is the process of photophosphorylation in which an electron expelled by the excited photocentre is returned to it after passing through a series of electron carriers. It is done by PS I. It occurs in thylakoid membrane.


Which one is correct regarding electrocardiograph (ECG)?

  • P- wave represents the electrical excitation of the ventricle.

  • QRS complex represents repolarisation of the ventricles

  • T- wave represents repolarisation of the atria

  • By counting the number of QRS complexes one can determine the pulse rate


By counting the number of QRS complexes one can determine the pulse rate

The P- wave represents electrical excitation of the atria, which leads to the contraction of both the atria. 

The QRS complex represents the depolarisation of the ventricles, which initiate the ventricular contraction.

The T- wave represents the return of the ventricles from excited to normal state. 

Therefore, by counting th number of QRS complexes that occur in a given time period, one can determine the heart beat rate of an individual.


Which of the following have porous body and are diploblastic?

  • Aurelia and Obelia

  • Adamsia and Euplectella

  • Leucosolenia and Spongilla

  • Sycon and Hydra


Leucosolenia and Spongilla

Leucosolenia is a genus of calcareous sponges belonging to the family Leucosoleniidae. It appears as groups of curved vases, up to 2 cm long, each ending in an osculum.

Spongillia is a genus of freshwater sponges in the family Spongillidae found in lakes and slow streams.