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The internal structure of a plant stem is observed. There is a discontinuous ring of angular collenchyma below the epidermis. Type of vascular bundles are of the same type as in the stems of solanaceous plants. Sieve tube elements possess simple sieve plates identify the plant.

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Important Questions on Histology and Anatomy of Flowering Plants

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Arrange the following plants in ascending order based on the number of xylem strands in their roots:
(I) Trapa (II) Pisum (III) Castanea (IV) Nicotiana
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In which one of the following the usual taxonomic hierarchy is not followed?
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Assertion (A) : A morphology based approach to taxonomy is called 'alpha taxonomy' and it is old-fashioned.

Reason (R) : A multi-disciplinary approach to taxonomy called 'Omega taxonomy' is favoured in recent years, as it excludes morphological features.

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Study the following lists:

  List-I   List-Ii
(A) Lactuca (I) Next to Heteromerae
(B) Physalis (II) Before Calyciflorae
(C) Althea (III) Next to Disciflorae
(D) Derris (IV) Between Calyciflorae and Heteromerae
    (V) Between Thalamiflorae and Calyciflorae

The correct match is :

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The raw material obtained from which one of the following plants is used in paper making?
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The triploid number of chromosomes of the first taxon is 10 times more than the haploid number of chromosomes of the second taxon, while the diploid number of the third taxon is 6 times than the haploid number of the fourth taxon. Which one of the following shows the ascending order of the number of chromosomes in their respective endosperm?
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Triticale is a hybrid formed from the members belonging to the following families:
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Assertion (A) : Restriction endonucleases are also called “molecular scissors”.

Reason (R): When fragments generated by restriction endonucleases are mixed, they join together due to their sticky ends.