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11th Standard English Medium Biology (Botany) Subject Plant Kingdom Book Back 2 Mark Questions with Solution updated Book back Questions

Published on: 13/05/2022

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Std: 11th Standard - Biology

chapter: - Book back Questions

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Questions:

Generic 5

1 x 5 = 5

Differentiate haplontic and diplontic life cycle.

Generic 2

3 x 2 = 6

Mention two characters shared by gymnosperms and angiosperms.

What do you infer from the term pycnoxylic?

What is plectostele? Give example.

Generic 3

1 x 3 = 3

Do you agree with the statement 'Bryophytes need water for fertilization'? Justify your answer.

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Answers Key:

Generic 5

1 x 5 = 5

S.No	Haplontic life cycle	Diplontic life cycle
1	Gametophytic phase is dominant, photosynthetic and independent, whereas sporophytic phase is represented by the zygote. Zygote undergoes meiosis to restore haploid condition.	Sporophytic phase (2n) is dominant, photosynthetic and independent. The gametophytic phase is represented by the single to few-celled gametophyte. The gametes fuse to form zygote which develops into sporophyte.
2	Eg: Volvox, Spirogyra.	Eg: Fucus, gymnosperms and angiosperms.

Generic 2

3 x 2 = 6

(i) Presence of well organised plant body which is differentiated into roots, stem and leaves.
(ii) Presence of eustele.

In pycnoxylic the secondary growth in wood is compact with narrow medullary ray. Eg. Pinus

Xylem plates alternate with phloem plates. Eg: Lycopodium clavatum.

Generic 3

1 x 3 = 3

Yes. The antheridia produce biflagellate antherozoids which swim in thin film of water and reach the archegonium and fuse with the egg to form diploid Zygote. Hence they need water for completing their life cycle.