Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Tracheids differ from other treachery elements

  • having Casparian strips

  • being imperforate

  • lacking nucleus

  • being lignified


B.

being imperforate

Tracheids and vessels both are called tracheary elements because their main function is conduction of sap. They differ from each other in being inspectorate. Tracheids are the specific cells which pit to support upwards and lateral conduction of water sap. Tracheid are comparatively short and single cell, while vessels have more than one cell and up to 10 cm long.

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2.

Five Kingdom system of classification suggested by RH Whittaker is not based on

  • presence or absence of a well-defined nucleus

  • mode of reproduction

  • Mode of nutrition

  • Complexity of body organisation


A.

presence or absence of a well-defined nucleus

RH Whittaker's classification is nor based on presence or absence of a well - defined nucleus. He gave five kingdom classification and used five criteria for delimiting kingdoms.

These are

both come under body organisation

(i) Complexity of cell structure

(ii) Complexity of body structure

(iii) Mode of nutrition

(iv) Ecological life cycle including mode of reproduction

(v)Phylogenetic relationship.

He divided organisms into five kingdoms as follows:

Kingdom  - Monera

Kingdom - Protista

Kingdom - Fungi

Kingdom - Plantae

Kingdom - Animalia

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3.

The solid linear cytoskeletal elements having a diameter of 6 nm and made up of a single type of monomer are known as

  • microtubules

  • microfilaments

  • intermediate filaments

  • lamins


B.

microfilaments

Microfilaments (actin filament) are the thinnest filaments of the cytoskeleton. They are found in the cytoplasm of the eukaryotic cells.
The constituents the cytoskeleton through which the cells acquire shape their diameter is approximate. (6 nm)

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4.

An example of edible underground stem is

  • carrot

  • groundnut

  • sweet potato

  • potato


D.

potato

Potato (Solanum tubersosum) is an edible underground stem which becomes fleshy and tuberous as a result of food storage.

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5.

Which structures perform the function of mitochondria in bacteria?

  • Nucleoid

  • Ribosomes

  • Cell wall

  • Mesosomes


D.

Mesosomes

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6.

Archaebacteria differ from eubacteria in

  • cell membrane structure

  • mode of nutrition

  • cell shape

  • mode of reproduction


A.

cell membrane structure

Archeabacteria different from eubacteria in that eubacteria has two cell membrane composed mainly of glycerol - ester lipids, while archaebacteria have a membrane made up of glycerol - ether lipid. Ether lipids are chemically more resistant then ester lipids. This stability help archaebacteria survive at high temperature and in very acidic or alkaline environment. 

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7.

During which phase (s0 of the cell cycle, the amount of DNA in a cell remains at the 4C level if the initial amount is denoted as 2C?

  • Go and G1

  • G1 and S

  • Only G2

  • G2 and M


D.

G2 and M

During the S or synthetic phase, the DNA content double, i,e, from 2C to 4C for all diploid cells. The G2 phase follows the S-phase and is called second growth phase or pre-mitotic gap phase. In G2 phase the synthesis of DNA stops, therefore, the DNA level remains 4C if initial was 2C

However, the formation of RNA and protein continues as they are required for the multiplication of cell organelles, spindle formation and cell growth. This amount becomes, half (i.e,) 2C only during anaphase (in mitosis) when chromosomes separate.

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8.

Match the following and select the correct answer.

Column I

Column  II

A.

Centriole

1.

Infolding in mitochondria

B.

Chlorophyll

2.

Thylakoids

C.

Cristae

3.

Nucleic acid

D.

Ribozymes

4.

Basal body cilia of flagella

  • A

    B

    C

    D

    4

    3

    1

    2

  • A

    B

    C

    D

    1

    2

    4

    3

  • A

    B

    C

    D

    1

    3

    2

    4

  • A

    B

    C

    D

    4

    3

    1

    2


A.

A

B

C

D

4

3

1

2

a) Centriole: In an organism with flagella and cilia, the position of these organelles is determined by the mother centriole which becomes the basal body.

b) Chlorophyll: Chlorophyll molecules are specially arranged in and around photosystem that is embedded in the thylakoid membrane of the chloroplast.

c) Cristae: These are folded in the inner membrane of mitochondria, which provides a large amount of surface area for chemical reaction.

d) Ribozymes (Ribonucleic acid enzymes) is an RNA molecule that is capable of catalysing the specific biochemical reaction of nucleic acids.

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9.

Dr F went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly cut coleoptile stumps. Of what significance is this experiment?

  • It made possible the isolation and exact identification of auxin

  • It is the basis for quantitative determination of small amounts of growth - promoting substances

  • It supports the hypothesis that IAA is auxin

  • It demonstrated polar movement of auxins


B.

It is the basis for quantitative determination of small amounts of growth - promoting substances

Dr. F went isolated auxin from Avena coleoptile tip. His experiment demonstrated the polar movement of auxins.

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10.

Which of the following is responsible for peat formation?

  • Marchantia

  • Riccia

  • Funaria

  • Sphagnum


D.

Sphagnum

Peat is mainly an accumulation of partially decayed vegetation or organic matter and Sphagnum accumulations can store water since both living and dead plants can hold large quantities of water and living matter (like meat eggs) for long distance transport inside their cells hence, it is responsible for peat formation.

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