Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The 1st COfixation product of Cplant is

  • Oxaloacetic acid

  • ribulose biphosphate

  • phosphoenolpyruvate

  • phosphoglyceric acid.


2.

Which of the following genera is associated with coralloid roots?

  • Cycas

  • Taxus

  • Pinus

  • Sequoia


3.

Cholesterol is a precursor for each of the following except

  • bile salts

  • vitamin D

  • insulin

  • steroids


4.

Match the following and select correct option.

  Column1        Column2

A. Pteris           1) Gymnosperm

B. Cycas           2) Bryophyte

C. Sphagnum    3) Algae

D. Sargassum   4) Pteridophyta

  • A-(4), B-(2), C-(1), D-(3)

  • A-(4), B-(1), C-(2), D-(3)

  • A-(2), B-(3), C-(4), D-(1)

  • A-(1), B-(4), C-(3), D-(2)


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5.

Which of the following groups of algae produces algin?

  • Phaeophyceae and Chlorophyceae

  • Rhodophyceae and Phaeophyceae

  • Chlorophyceae and Rhodophyceae

  • Phaeophyceae only


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6.

Mature RBCs lose their ability for

  • DNA replication

  • Anaerobic respiration

  • Aerobic respiration and DNA replication

  • Aerobic respiration, DNA replication and RNA synthesising machinery


D.

Aerobic respiration, DNA replication and RNA synthesising machinery

Matured mammalian RBCs do not have cell organelles including nucleus, Golgi bodies, mitochondria, ribosomes, centrioles and endoplasmic reticulum. It increases the surface area of RBCs and enables them to contain more haemoglobin. In the absence of cell organelles, the consumption of oxygen is very low and thus anaerobic respiration occurs in RBCs. Mature RBCs cannot replicate and cannot synthesise RNA as they do not possess machinery required (e.g., various enzymes) for replication and RNA synthesis.


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7.

Which one of the following is an incorrect combination

  • Adenine, thymine, cytidine

  • Adenine, cytosine, thymine

  • Guanine, thymine, uracil

  • Cytosine, uracil, guanine


8.

Hiccups can be best described as

  • forceful sudden expiration

  • forceful contraction of intercostal muscles during deep breathing

  • vibration of the soft palate during breathing while sleeping

  • jerky incomplete inspiration.


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9.

Which part of the nephrons is impermeable to water

  • Proximal convoluted tubule

  • Distal convoluted tubule

  • Ascending limb of loop of Henle

  • Descending limb of loop of Henle


10.

Gonadotropin releasing hormone is transferred to anterior pituitary by

  • left coronary artery

  • hypophysial portal veins

  • axons of neurosecretory cells

  • nuclei of hypothalamus


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