Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

21.

Assertion: Protons or hydrogen ions produced by photolysis of water accumulate in the lumen of thylakoids.

Reason: Photolysis of water takes place in inner membrane of thylakoid.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


22.

Assertion: Plant growth as a whole is indefinite.

Reason: Plants retain the capacity of continuous growth throughout their life.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


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23.

Which of the following is a correct match

  • Frog - External ears

  • Earthworm - Muscular gizzard, typhlosole

  • Human - Fat globule, 10 pairs of cranial nerves

  • Cockroach - Chilopoda


B.

Earthworm - Muscular gizzard, typhlosole

Frogs do not have external ears. Instead, they have an eardrum of sorts, called a tympanum, which is just behind each eye.

Typhlosole are internal folds of the intestine or intestinal inner wall. Typhlosole occurs in bivalve mollusks, lampreys and some annelids and echinoderms. The gizzard, also referred to as the ventriculus, gastric mill, and gigerium, is an organ found in the digestive tract of some animals, including birds, reptiles, earthworms and some fish. This specialized organ constructed of thick, muscular walls is used for grinding up food; often rocks are instrumental in this process. In certain insects and mollusks, the gizzard features chitinous plates or teeth.

Humans have 12 pairs of cranial nerves. Cockroach belongs to class insecta of phylum arthropoda.


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24.

Which of the following is an incorrect statement

  • Blood group 'O' person have A and B antigens on RBCs.

  • Eosinophils resist infections and are associated with allergic infection.

  • RBC's contain carbonic anhydrase.

  • T wave of normal ECG represent of depolarization of ventricle.


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25.

Which one of the following is correct regarding the excretion

  • Large amount of water from renal filtrate is reabsorbed in DCT and a less amount is reabsorbed by PCT.

  • The descending limb of loop of Henle is completely impermeable to salts.

  • Malpighian corpuscle is found in medulla region of kidney.

  • The colour of urine is pale yellow and is slightly alkaline in nature.


26.

The opening between the right atrium and the right ventricle is guarded by the valve named

  • bicuspid valve

  • mitral valve

  • tricuspid valve

  • semilunar valve.


27.

Skeletal muscles appear striated due to presence of two characteristic proteins in alternating dark and light bands. Which of the following is a correct match of the protein with its light refractive property and colour

  • Protien  Colour Property
    Myosin Light Anisotropic
  • Actin Dark Anisotropic
  • Myosin Dark Isotropic
  • Actin  Light Isotropic

28.

Assertion: In angiosperms, transport of food and water is more efficient than gymnosperms and pteridophytes.

Reason: In angiosperms longitudinally arranged sieve elements and vessels with perforated end walls are present.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


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29.

Assertion: Glycerides are important nutrients for body.

Reason: Glycerides are hydrolysed into glycerol and fatty acids which are further absorbed in intestine by the formation of chylomicron.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


30.

Assertion: Blood in cockroach is colourless haemolymph with no respiratory pigment.

Reason: Respiration in cockroach occurs through diffusion in haemolymph.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


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