NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


Based on cellular mechanisms there are two major types of regeneration found in the animals. Which one of the following is the correct example of the type mentioned?

  • Morphallaxis - Regeneration of two transversely cut equal pieces of a Hydra into two small Hydras

  • Epimorphosis - Replacement of old and dead erythrocytes by the new ones

  • Morphallaxis - Healing up of a wound in the skin

  • Epimorphosis - Regeneration of crushed and filtered out pieces of a Planaria into as many new Planarians


Which one of the following four secretions is correctly matched with its source, target and nature of action?

  • Secretion Source Target Action
    Gastrin Stomach lining Oxyntic cells Production of HCl
  • Inhibin Sertoli cells Hypothalamus Inhibition of secretion of gonadotropin releasing hormone
  • Enterokinase Duodenum Gall bladder Release of bile juice
  • Atrial Natiuretic Factor (ANF) Sinu atrial node (SAN) M- cells of Atria Juxta- glomerular apparatus (JGA) Inhibition of release of renin


Which one of the following four glands is correctly matched with the accompanying description ?

  • Thyroid - hyperactivity in young children causes cretinism

  • Thymus - starts undergoing atrophy after puberty

  • Parathyroid - secretes parathormone which promotes movement of calcium ions from blood into bones during calcification

  • Pancreas - Delta cells of the Islets of Langerhans secrete a hormone which stimulates glycolysis in liver


Formation of non-functional methaemoglobin causes blue-baby syndrome. This is due to

  • excess of arsenic concentration in drinking water

  • excess of nitrates in drinking water

  • deficiency of iron in food

  • increased methane content in the atmosphere


Two of the body parts which do not appear in MRI may be

  • molar teeth and eye lens

  • scapula and canines

  • ligaments and ribs

  • tendons and premolars


Which one of the following statements is correct with respect to salt water balance inside the body of living organisms?

  • when water is not available camels do not produce urine but store urea in tissues.

  • Salmon fish excretes lot of stored salt through gill membrane when in fresh water

  • Paramecium discharges concentrated salt solution by contractile vacuoles

  • The body fluids of fresh water animals are generally hypotonic to surrounding water


The family containing mustard and its main characters are

  • Brassicaceae - Tetramerous flowers, six stamens, bicarpellary gynoecium, siliqua type fruit

  • Brassicaceae - Pentamerous flowers, many stamens, pentacarpellary gynoecium, capsule type fruit

  • Solanaceae - Pentamerous flowers, five stamens, bicarpellary gynoecium, berry type fruit

  • Poaceae - Trimerous flowers, three stamens, monocarpellary gynoecium, caryopsis type of fruit.


Which one of the following statements pertaining to plant structure is correct?

  • Cork lacks stomata, but lenticels carry out transpiration.

  • Passage cells help in transfer of food from cortex to phloem

  • Sieve tube elements possess cytoplasm but no nuclei.

  • The shoot apical meristem has a quiescent centre


When synapsis is complete all along the chromosome, the cell is said to have entered a stage called

  • zygotene

  • pachytene

  • diplotene

  • diakinesis


Many cells function properly and divide mitotically even though they do not have

  • plasma membrane

  • cytoskeleton

  • mitochondria

  • plastids