Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

21.

A person is undergoing prolonged fasting. His urine will be found to contain abnormal quantities of

  • fats

  • ketones

  • amino acids

  • glucose


22.

Which one of the following depresses brain activity and produces feelings of calmness, relaxation and drowsiness?

  • Valium

  • Morphine

  • Hashish

  • Amphetamines


23.

The main organelle involved in modification and routing of newly synthesized proteins to their destinations is

  • mitochondria

  • endoplasmic reticulum

  • lysosome

  • chloroplast


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24.

Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because

  • four carbon acids are the primary initial CO2 fixation products

  • the primary fixation of CO2 is mediated via PEP carboxylase

  • effective pumping of CO2 into bundle sheath cells

  • RUBISCO in CO4 plants has higher affinity for CO2


B.

the primary fixation of CO2 is mediated via PEP carboxylase

The fixation of CO2 in C4 plants takes place in two places and by two different organic
compounds. Phosphoenol pyruvate (PEP) is found in mesophyll cells which primarily fixes atmospheric CO2 into oxaloaceticacid (4C).
RUBISCO is present in bundlesheath cells where final fixation of CO2 in hexose sugars takes place. CO2 is primarily fixed by PEP carboxylase because this enzyme has greater affinity to CO2 than RUBISCO.


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25.

At what stage of the cell cycle are histone proteins synthesized in a eukaryotic cell?

  • During entire prophase

  • During telophase

  • During S-phase

  • During G2 stage of prophase


26.

There exists a close association between the alga and the fungus within a lichen. The fungus

  • fixes the atmospheric nitrogen for the alga

  • provides protection, anchorage and absorption for the alga

  • provides food for the alga

  • releases oxygen for the alga


27.

Chlorophyll in chloroplasts is located in

  • grana

  • pyrenoid

  • stroma

  • both (a) and (c)


28.

Match items in Column- I with those in Column- II

Column- I Column- II
A. Peritrichous flagellation 1. Ginkgo
B. Living fossil 2. Macrocystes
C. Rhizophore 3. Escherichia coli
D. Smallest flowering plant 4. Selaginella
E. Largest perennial alga 5.Wolffia

Select the correct answer from the following

  • A B C D E

    2 1 3 4 5

  • A B C D E

    5 3 2 5 1

  • A B C D E

    1 2 5 3 2

  • A B C D E

    3 1 4 5 2


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29.

In which one pair both the plants can be vegetatively propagated by leaf pieces?

  • Bryophyllum and Kalanchoe

  • Chrysanthemum and Agave

  • Agave and Kalanchoe

  • Asparagus and Bryophyllum


30.

Top-shaped multiciliate male gametes and the mature seed which bears only one embryo with two cotyledons, are characteristic features of

  • polypetalous angiosperms

  • gamopetalous angiosperms

  • conifers

  • cycads


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