NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions



Which of the following are homosporous pteridophytes?

I. Selaginella

II. Lycopodium

III. Salvinia

IV. Equisetum

  • I and IV only

  • II and III only

  • II and IV only

  • III and IV only


II and IV only

Genera like Selaginella and Salvinia which produce two kinds of spores, macro (large) and micro (small) spores, are known as heterosporous pteridophytes. Lycopodium and Equisetum are homosporous pteridophytes i.e. they produce only one type of spores.


Identify the given structure

  • Adenylic acid

  • Uracil

  • Cholesterol

  • Adenosine


Cornea transplant in humans is almost never rejected. This is because

  • it is composed of enucleated cells

  • it is a non-living layer

  • its cells are least penetrable by bacteria

  • it has no blood supply


Pseudostratified epithelium is found in

  • seminiferous tubule

  • Fallopian tube

  • trachea

  • kidney tubules


The given figure shows schematic plan of blood circulation in humans with labels A to D. Identify the labels along with their functions and select the correct option.

  • C- Vena Cava - takes blood from body parts to right atrium, Pco2 = 45 mm Hg

  • D- Dorsal aorta - takes blood from heart to body parts, Po= 95 mm Hg

  • A- Pulmonary vein - takes impure blood from body parts to heart, Po2 = 60 mm Hg

  • B- Pulmonary artery - takes blood from heart to lungs, Po2= 90 mm Hg.


Which one of the following is not a mammalian character?

  • Presence of milk producing glands

  • Skin is unique in possessing hair

  • Presence of external ears called pinnae

  • Homodont type of dentition


Retrogressive metamorphosis occurs in

  • Hemichordata

  • Cephalochordata

  • Urochordata

  • Vertebrata


One hormone hastens maturity period in juvenile conifers, a second hormone controls xylem differentiation, while the third hormone increases the tolerance of plants to various stresses. They are respectively

  • Gibberellin, Auxin, Ethylene

  • Auxin, Gibberellin, Cytokinin

  • Gibberellin, Auxin, ABA

  • Auxin, Gibberellin, ABA


The H-zone in the skeletal muscle fibre is due to

  • the central gap between actin filaments extending through myosin filaments in the A-band

  • extension of myosin filaments in the central portion ofthe A-band

  • the absence of myofibrils in the central portion of A-band

  • the central gap between myosin filaments in the A-band.


The volume of 'anatomical dead space' air is normally

  • 230 mL

  • 210 mL

  • 190 mL

  • 150 mL