Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

After glycolysis, fate of glucose in mitochondrial matrix is

  • oxidation

  • reduction

  • oxidative decarboxylation

  • hydrolysis


A.

oxidation

After glycolysis, pyruvate forms acetyl Co-A which undergoes oxidation to form CO2and H2O through Krebs' cycle in mitochondrialmatrix.


2.

PS-II occurs only in

  • stroma

  • granal thylakoids

  • stromal lamella

  • matrix


B.

granal thylakoids

Photosystem II mostly occurs in the appressed regions of granal thylakoids.


3.

Cell theory was proposed by

  • a botanist

  • a zoologist

  • a botanist and a zoologist

  • a psychologist


C.

a botanist and a zoologist

Cell theory was proposed by a German botanist M.J. Schleiden and another German, a zoologist T.S. Schwann in 1839.


4.

In the given diagram A and B represent

  •              A               B
    Mineralisation Demineralisation
  •              A               B
    Ammonification Denitrification
  •              A               B
    Denitrification Ammonification
  •              A               B
    Denitrification Mineralisation

C.

             A               B
Denitrification Ammonification

In given diagram (A) represents denitrification and (B) represents ammonification. Denitrification is conversion of nitrates into nitrogen gas by some microorganisms e.g., Pseudomonas denitrificans, Thiobacillus denitrificans, Micrococcus denitrificans. Ammonification is conversion of dead remains of living organisms into ammonia with the help of microorganisms like Bacillus ramosus, B.vulgaris, B. mesentericus etc.


5.

Identify the given figures A, B, C, D and E.

                 

  •        A        B        C        D        E
    Marginal Axile Free central Parietal Basal
  •        A        B        C        D        E
    Marginal Parietal Free central Axile Basal
  •        A        B        C        D        E
    Marginal Axile Parietal Free central Basal
  •        A        B        C        D        E
    Marginal Axile Parietal Basal Free central

C.

       A        B        C        D        E
Marginal Axile Parietal Free central Basal

These are different arrangements of ovule attachment to inner surface of ovary wall. (A) represents marginal, (B) represents axile, (C) represents parietal, (D) represents free central, (E) represents basal placentation


6.

Cleistogamy is leading over anthesis because

  • pollination agent is not required

  • it assures heterozygosity

  • it favours insect pollination

  • it allows xenogamy


A.

pollination agent is not required

Cleistogamous flowers do not open at all. In such flowers, the anthers and stigma lie close to each other. Anthers when dehisce in the flower buds, pollen grains come in contact with the stigma to effect pollination Thus, cleistogamous flowers are autogamous as there is no chance of cross-pollination. So, no pollination agent is required in these flowers.


7.

In active transport, carrier proteins are used, which use energy in the form of ATP, to

  • transport molecules against concentration gradient of cell wall.

  • transport molecules along concentration gradient of cell membrane.

  • transport molecules against concentration gradient of cell membrane.

  • transport molecules along concentration gradient of cell wall.


C.

transport molecules against concentration gradient of cell membrane.

In active transport, carrier proteins which are located at membrane, use energy in the form of ATP to transport molecules against concentration gradient of cell membrane. Transportation rate reaches maximwn when all carrier proteins are being used or are saturated. These proteins are very specific to certain substances and are sensitive to inhibitors.


8.

Bacteria, fungi, lower plants survive in adverse conditions by

  • diapause

  • suspended growth

  • migration

  • formation of thick walled spores.


D.

formation of thick walled spores.

Bacteria, fungi and lower plants survive in adverse conditions through formation of thick walled spores. Algae form resting spore or akinetes which are thick walled spores and store food material. In fungi, thick walled perennating spores called chlamydospores are formed. Bacteria form endospores which is probably the most resistant living thing known. They may remain alive in boiling water for more than 2 hours.


9.

In a 50 gm living tissue, what would be the amount of water

  • 15- 25 gm

  • 25 - 30 gm

  • 35- 45 gm

  • 70- 90 gm


C.

35- 45 gm

Water is the most abundant chemical compound in living organism. In a cell, water occupies 70-90% of the cellular mass. So, in 50 gm of living tissue 35-45 gm of water would be present.


10.

Given figure shows 

  • structure of lenticel


  • hydathode showing gaseous vapour exchange

  • fungus reproducing by spore formation

  • algae reproducing by spore formation.


A.

structure of lenticel


The figure shows structure of lenticel which facilitates gaseous exchange and transpiration. These are aerating pores in the bark of woody trees. These are surrounded by loosely arranged thin walled complementary cells enclosing intercellular spaces for gaseous exchange.