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NEET biology

Question 1
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The 1st CO2 fixation product of C4 plant is

  • Oxaloacetic acid

  • ribulose biphosphate

  • phosphoenolpyruvate

  • phosphoglyceric acid.

Solution

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 C4 pathway.

Question 2
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Which of the following genera is associated with coralloid roots?

  • Cycas

  • Taxus

  • Pinus

  • Sequoia

Solution

A.

Cycas

Roots in Cycas are of two types- normal and coralloid roots. Coralloid roots are irregular, negatively geotropic, dichotomously branched coral like roots which do not possess root hairs and root caps. Coralloid roots have a symbiotic association with blue-green algae like Nostoc and Anabaena species

Question 3
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Cholesterol is a precursor for each of the following except

  • bile salts

  • vitamin D

  • insulin

  • steroids

Solution

C.

insulin

Cholesterol is a precursor of most steroid hormones like progesterone, estradiol, aldosterone, cortisol etc. Cholesterol forms vitamin D on UV exposure  and it also helps in forming bile salt

Question 4
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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)

Solution

B.

A-(4), B-(1), C-(2), D-(3)

Question 5
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Which of the following groups of algae produces algin?

  • Phaeophyceae and Chlorophyceae

  • Rhodophyceae and Phaeophyceae

  • Chlorophyceae and Rhodophyceae

  • Phaeophyceae only

Solution

D.

Phaeophyceae only

Alginic acid(or algin or alginate) is an anionic polysccharide distributed widely in the cell walls of many brown algae (Phaeophyceae). It is a phycocolloid which is obtained commercially from Laminaria, Macrocystis, Nereocystis, Fucus, Sagrassum etc.