The 1st CO2 fixation product of C4 plant is from Biolo

Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

The 1st COfixation product of Cplant is

  • Oxaloacetic acid

  • ribulose biphosphate

  • phosphoenolpyruvate

  • phosphoglyceric acid.


A.

Oxaloacetic acid

In C4 Plants, initial fixation of carbon dioxide occurs in mesophyll cells. The primary acceptor of CO2 i.e. phosphoenol pyruvate (PEP) combines with CO2 in the presence of PEP carboxylase or PEPcase to form oxaloacetic acid, which is the first stable carbon dioxide fixation product in Cpathway.


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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


6.

Mature RBCs lose their ability for

  • DNA replication

  • Anaerobic respiration

  • Aerobic respiration and DNA replication

  • Aerobic respiration, DNA replication and RNA synthesising machinery


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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