NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


Match the source gland with its respective hormone and function and select the correct option.

  • Source gland Hormone Function
    Anterior pituitary Oxytocin Contraction of uterine muscle
  • Source gland Hormone Function
    Anterior pituitary Vasopressin Induces reabsorption of water in nephron
  • Source gland Hormone Function
    Thymus Thymosin Proliferation of T- lymphocytes
  • Source gland Hormone Function
    α- cells of islets of Langerhans Glucagon Uptake of glucose into the cell


Source gland Hormone Function
Thymus Thymosin Proliferation of T- lymphocytes

Oxytocin is released by posterior pituitary.

Vasopressin decreases the amount of urine by increasing reabsorption of water from DCT and collecting tubules.It stimulates the contraction of walls of blood vessels.

Glucagon stimulates liver to convert stored glycogen into glucose and thus raises the blood sugar level.

Thymus releases thymosin which aids in proliferation of T- lymphocytes.


In which of the following sets of organisms, does the external fertilization occur?

  • Echinodermata and mosses

  • Hemichordata and ferns

  • Amphibians and algae

  • Reptiles and gymnosperms


Amphibians and algae

External fertilization is the fertilization that occurs outside the body of the organism. It requires an external medium such as water for its fertilization.Thus, in most aquatic organisms such as a majority of algae, fishes and amphibians, this type of fertilization occurs.


C4 plants have better productivity because

  • C4 plants absorb more light

  • C4 plants absorb more CO2

  • C4 plants does not carry photorespiration

  • C4 plants have more amount of RuBisCO


C4 plants does not carry photorespiration

Presence of photorespiration isa wasteful and energy consuming process in crop plants which ultimately leads to reduction in final yield of crops. During C3 photosynthesis, upto 50% of the CO2 fixed may have to pass through photorespiratory process, thereby resulting in considerable decrease in photosynthetic productivity. In C3 plants, there is little loss of photosynthetic activity on account of photorespiration which is absent in C4 plants and hence they have better productivity.


From the following groups, select the one which has only secondary metabolites?

  • Arbrin, cellulose, arginine, tyrosine

  • Glycine, gums, serine, diterpenes

  • Carotenoids, phenylalanine, curcumin, rubber

  • Conclavin-A, morphine, codeine, vinblastin


Conclavin-A, morphine, codeine, vinblastin

Secondary metabolites are derivatives of primary metabolites which have no direct function in growth and development of plants. These compounds arc accessory rather than central to the functioning, e.g., arbrin, cellulose, gums, diterpenes, carotenoids, curcumin, rubber etc. Arginine, tyrosine, glycine, serine and phenylalanine are amino acids, which are primary metabolites.


In a diploid cell, at which stage of cell cycle, the amount of DNA is doubled?

  • G1 and G2 phase

  • G0 phase

  • S, G2 and M phase

  • S phase


S phase

S- phase orSynthesis phase is the phase where DNA replication takes place. It takes place on the template of the existing DNA and thus, the amount of DNA per cell doubles. If the initial amount of DNA is denoted as 2C, then it increases to 4C.


Intercalated discs are characteristic of muscles found in

  • heart

  • thigh

  • urinary bladder

  • stomach



Cardiac muscle fibres are found in the wall of heart. They have dark intercalated discs at intervals. These are the specialized regions of cell membranes of two adjacent fibres. They permit the wave of muscle contraction to be transmitted from one cardiac fibre to another.


India is one of the twelve megadiversity countries with of genetic resources of the world

  • 12.1%

  • 18.1%

  • 38.1%

  • 8.1%



The total number of species estimated is about 1.74 million. Out of these , species in India is roughly 8.1%. India with about 45000 species of plants and twice as many species of animals is one of the 12 megadiversity countries of the world.


Which of the following is not an invasive species?

  • Parthenium hysterophorus

  • Nelumbo (lotus)

  • Lantana camara

  • Eichhornia crassipes


Nelumbo (lotus)

Non-native or alien species are often introduced accidently for their economic and other uses. They often become invasive ' and drive away the local species. Therefore, these species are second major cause of extinction.

Lantana camarahas replaced many species in forests of Central India.

Parthenium hystero- phorus has pushed out various shrubs and herbs from open places in the plains.

Water hyacinthEicchornia crassipes is used in India to reduce pollution.


Stinging capsules (nematocysts) are found in

  • wasp and honeybee

  • scorpion and cobra

  • sea pen and sea fan

  • cactus and Venus flytrap


sea pen and sea fan

Stinging cells are used for offence and defence. They have nematocysts, composed of capsule, shaft and thread tube. The thread tube coils around the prey or attaches to it and injects a toxin called hypnotoxin which paralyzes the victim. They are found in cnidarians- sea pen (Pennatula), sea fan (Gorgonia) etc.


Occurrence of triploid (3n) primary endosperm nucleus is a characteristic feature of

  • Algae

  • Gymnosperms

  • Angiosperms

  • Bryophytes



Endosperm nourishes embryo in seed plants. In gymnosperms, it represents the female gametophyte and is haploid (n). In angiosperms, it is a special tissue which is formed as a result of fusion of a male gamete with diploid secondary nucleus of the central cell. The fusion product is primary endosperm cell having a triploid (3n) endosperm nucleus.