Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Chlorosis is produced in the leaves due to the deficiency of Fe, Mg, Mn, S or N of these essential elements, those that are exclusive constituents of chlorophyll molecule are

  • Fe, S

  • N,S

  • Mg, S

  • Mg, N


D.

Mg, N

Magnesium is present in the central position of tetrapyrrole ring of the chlorophyll molecule. Porphyrin is a cyclic tetrapyrrole ring made up of four nitrogen-containing pyrrole rings arranged in a cyclic fashion in the chlorophyll molecule.


12.

 Match the following column I and II for organismic respiration.

Column I Column II
A. Respiration in bacteria 1. Mitochondria
B. Respiration in cyanobacteria 2. Cytoplasmic membrane
C. Respiration in eukaryotic cell 3. Mesosomes

  •  A-2, B-3, C-1

  • A-3, B-2, C-1

  • A-1, B-3, C-2

  • A-3, B-1, C-2


B.

A-3, B-2, C-1

Respiration is carried out by different types of organisms at different sites. In bacteria and cyanobacteria, the mitochondria are not present, so respiration occurs in them in mesosomes.


13.

Haldane effect refers to

  • More acidity in the blood

  • Less acidity in the blood

  • More basicity in the blood

  • Less basicity in the blood


A.

More acidity in the blood

Oxyhaemoglobin behaves as a strong acid. As more and more oxyhaemoglobin forms in the lungs. it releases more and more H+ ions increasing the acidity of the blood. This is known as the Haldane effect.


14.

Read the following statements and choose the correct option.

I. Leptosporangiate development of sporangium is found in all membersPteropsida.

II. Seed habit is shown by sellaginella.

III. Gnetum leaves are monomorphic and pinnately compound.

IV. Sporic meiosis is found in VolvolxChalmydomonas and Ulothrix.

Choose the correct option.

  • I and IV

  • I and II

  • I, II and IV

  • All of these


C.

I, II and IV

I, II and IV are correct statements. Pinus leaves are polymorphic and pinnately compound. In Gnetum leaves are evergreen opposite 8-20 cm long and 3-10 cm broad, enter at maturity glossy dark.


15.

Which of the following characteristics out of I, II and III are exhibited by Cplants?

I. Kranz anatomy.

II. The product of photosynthesis is oxalo acetic acid.

III. Both PEP carboxylase and ribulose-bis phosphate carboxylase act as carboxylating enzyme.

Choose the correct option.

  • I and II, but not III

  • II and III, but not I

  • I and III, but not II

  • All of these


D.

All of these

C4 plants have an alternative CO2 fixation pathway called Hatch and Slack cycle where QAA, a 4C compound is the first stable product. These plants have Kranz anatomy in leaf.


16.

Compare the statements I and II and choose the correct option.

Statement (I) Auxin promotes apical dominance by suppressing the activity of lateral buds.

Statement (II) In moriculture, periodic pruning of shoot tips is done to make mulberry plants bushy.

Choose the correct options

  •  I is false, but II is true

  • II is false, but I is true

  • Both I and II are true

  • Both I and II are false


C.

Both I and II are true

Periodic pruning of lateral buds always makes a plant bushy.


17.

In coconut, the liquid endosperm is formed because

  • Karyokinesis is not followed by cytokinesis

  • Karyokinesis is followed by cytokinesis

  • Formation of the liquid endosperm is not dependent upon karyokinesis and cytokinesis

  •  None of the above


C.

Formation of the liquid endosperm is not dependent upon karyokinesis and cytokinesis

In coconut, the karyokinesis is not followed by cytokinesis after a free nuclear division so, the endosperm takes a liquid form.


18.

Keeping is viewed the structure of cell membrane, which one of the following statements is correct with respect to the movements of liquid and proteins from one liquid monolayer to the other (flip-flop movement).

  • While proteins can flip flop, liquids can not

  • Neither lipids, nor proteins can flip flop

  • Both lipids and proteins can flip flop

  • While lipids can rarely flip-flop, proteins can not


D.

While lipids can rarely flip-flop, proteins can not

The flip-flop movement refers to the transfer of lipid molecules from one side of the bilayer to the other, Enzymes are concerned with the enzymatic activity of the membrane.


19.

Ribosomes are particles about 200 Å units in diameter consisting of protein and RNA. The percentage of protein and RNA is respectively

  • 80% and 20%

  • 60% and 40%

  • 50% and 50%

  • 40% and 60%


B.

60% and 40%

Chemically, ribosomes are made up of rRNA 60% and protein 40%. These are known as protein factories as these are the sites for protein synthesis.


20.

Match the biological molecule listed under column I with their biological function listed under column II. Choose the answer which gives correct combination of alphabet of the two columns.

Column I (Biological Molecule) Column II (Function)
A. Glycogen 1. Hormone
B. Globulin 2. Biocatalyst
C. Steroid 3. Antibody
D. Thrombin 4. Storage Product

 

  • A-3, B-2, C-4, D-1

  • A-4, B-2, C-1, D-3

  • A-2, B-4, C-3, D-1

  • A-4, B-3, C-1, D-2


D.

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

Glycogen is stored in the liver and muscle of animals. All steroid hormones are derived from cholesterol. Immunoglobulin is an antibody that freely circulates in blood plasma. Thrombin brings about the conversion of fibrinogen to fibrin during blood clotting mechanism.