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


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


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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


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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


B.

provides protection, anchorage and absorption for the alga

Lichen is a symbiotic association between a fungus and an algae (green alga or blue green alga). The algal partner of lichen is called as phycobiont while fungal partner is termed as mycobiont. It develops into a unique morphological form which is quite distinct from either partner.

The fungal partner of lichen helps in the absorption of water and mineral to algal partner additionally it also provides protection and anchorage to algal partner of lichen. In exchange of this, the fungal partner absorbs prepared food material from algal partner. This food material is prepared by the algal partner of lichen through the process of photosynthesis.


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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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