NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


If for some reason the parietal cells of the gut epithelium become partially non-functional, what is likely to happen?

  • The pancreatic enzymes and specially the trypsin and lipase will not work efficiently

  • The pH of stomach will fall abruptly

  • Steapsin will be more effective

  • Proteins will not be adequately hydrolyzed by pepsin into proteoses and peptones


Proteins will not be adequately hydrolyzed by pepsin into proteoses and peptones

The parietal cells or oxyntic cells are large, rounded cells located upon the surface of gastric glands. These cells secrete HCl (which converts inactive pepsinogen into active pepsin) and Castle's Intrinsic Factor of CIF (which helps in the absorption of vitamin -B12 or cyanocobalamine). If somehow, parietal cells become partially non-functional, the patient will suffer from achlorhydria (no HCl) or hypochlorhydria (less HCl).This will result in the non- activation of pepsinogen due to which proteins will not be adequately hydrolysed into proteoses and peptones. Lack of CIF will cause vitamin-B12 deficiency, which will result in pernicious anaemia.



One of the commonly used plant growth hormone in tea plantations is 

  • ethylene

  • abscisic acid

  • Zeatin

  • indole-3- acetic acid


indole-3- acetic acid

Tea plants are grown by stem cuttings. If we dip the lower cut end of a cutting in a dilute solution of auxins (IAA, IBA etc) , large number large number of roots are developed on the cut ends, due to which these cutting develop into successful plants.



Read the following four statements, A, B,C and D select the right option having both correct statements.

A) Z scheme of light reaction takes place in presence of PS- I only.

B) Only PS-I is functional in cyclic photophosphorylation.

C) Cyclic photophosphorylation results into synthesis of ATP and NADPH2

D) Stroma lamellae lack PS-II as well as NADP.

  • B and D

  • A and B

  • B and C

  • C and D


B and D

Cyclic photophosphorylation is performed by PS-I only. In this process, an electron expelled by the excited photo centre, ie, P700 is returned to it after passing through a  series of electron carriers. 

PS- I is located on both the non- appressed part of grana thylakoids as well as stroma thylakoids, while PS-II is located in the appressed part of grana thylakoids only, stroma thylakoids lack PS-II.



An example of endomycorrhiza is 

  • Nostoc

  • Glomus

  • Agaricus

  • Rhizobium



Nostoc is a blue-green algae capable of fixing nitrogen. 
Glomus is associated with endomycorrhiza.
Agaricus or mushroom is an edible fungus of class-Basidiomycetes.
Rhizobium is a symbiotic nitrogen -fixing bacterium found in the root nodules of leguminous plants.



Which one of the following pairs of structures is correctly matched with their correct description?

  • Structure


    Tibia and fibula

    Both form parts of knee joint

  • Structure


    Cartilage and cornea

    No blood supply but do require oxygen for respiratory

  • Structure


    Shoulder joint and elbow joint

    Ball and socket type of joint







    Premolars and molars

    20 in all and 3 rooted







Cartilage and cornea

No blood supply but do require oxygen for respiratory

Cartilage is usually described as a vascular, as the blood vessels innervate only the outer fibrous sheath of cartilage, called perichondrium. The cornea is the transparent anterior portion of the outer coat of the vertebrate eye covering the iris and the pupil. It is avascular as it lacks lymphatic and blood vessels.



Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statement is not correct during the process of nitrogen fixation?

  • Leghaemoglobin scavenges oxygen and is pinkish in colour

  • Nodules act as a site for nitrogen fixation

  • The enzyme nitrogenase catalyse the conversion of atmospheric N2 to NH3

  • Nitrogenase is insensitive to oxygen


Nitrogenase is insensitive to oxygen

Root nodules of leguminous plants harbour symbiotic bacteria, Rhizobium, which fixes atmospheric nitrogen and provides the plant with most or all of its nitrogen requirements. In return, they have access to a rich supply of carbohydrate. The fixation of atmospheric nitrogen (N2) to ammonia (NH3) occurs within the nodules, using the enzyme nitrogen cut this enzyme is very sensitive to oxygen and gets inhibited in oxygen rich environment. This problem is solved by leghaemoglobin, a pinkish-red, oxygen-binding, iron-containing protein present in root nodules. It functions as oxygen buffer, scavenges oxygen and provides the enzyme nitrogenase, a low oxygen environment in which nitrogen fixation can occur.



In which one of the following organism, its excretory organs are correctly stated?

  • Humans- Kidneys, sebaceous glands and tear glands

  • Earthworm -Pharyngeal, integumentary and septal nephridia

  • Cockroach - Malpighian tubules and enteric caeca

  • Frog - Kidneys, skin and buccal epithelium


Earthworm -Pharyngeal, integumentary and septal nephridia

In earthworm, the excretory system is made up of many segmentally arranged microscopic coiled tubes called nephridia. These are ectodermal in origin and analogous to the vertebrate kidney.
In Pheretima, following three types of nephridia are seen.

(i) Pharyngeal nephridia - Situated on either side of pharynx and oesophagus in 4, 5 and 6 segments.

(ii) Integumentary nephridia - Scattered in the body wall, seen from 7th segment onwards

(iii) Septal nephridia - Largest nephridia attached to both faces of each intersegment septum behind 15th segment



Which one of the following is a xerophytic plant in which the stem is modified into the flag green and succulent structure? 

  • Opunita

  • Casuarina

  • Hydrilla

  • Acacia



opuntia is a plant growing in dry and xeric habitats.In this, the stem, having several nodes and internodes is modified into flat, fleshy, thick green,  leaf-like structure called phylloclades. Phylloclade performs the function of photosynthesis like a leaf and also stores food leaves get modified into spines which help to reduce transpiration.



Given below are four statements (A-D) regarding human blood circulatory system

  • Arteries are thick -walled and have narrow lumen as compared to veins

  • Angina is acute chest pain when the blood circulation to the brain reduced.

  • Persons with blood group-AB can donate blood to any person with any blood group under ABO system

  • Calcium ions play a very important role in blood clotting


Arteries are thick -walled and have narrow lumen as compared to veins

Arteries are the blood vessels which carry blood away from the heart. In comparison to veins, arteries have a narrow lumen and more muscular thick walls to bear the pressure of pumping action of the heart.
Angina is constricting chest pain caused due to reduced blood supply to the heart wall.
Persons with blood group- AB are universal acceptor, while those with blood group -O are a universal donor. 



The haemoglobin content per 100 mL of blood of a normal healthy human adult is 

  • 5-11 g

  • 25-30 g

  • 17-20 g

  • 12-16 g


12-16 g

The normal haemoglobin count is about 15 gm/100 mL of blood in males, while for females the haemoglobin count is slightly less, ie, 13 gm/100 mL blood.