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CBSE 11th Standard Biology Subject Plant Kingdom HOT Questions 1 Marks Questions 2021

Published on: 29/05/2021

QB365 Provides the HOT Question Papers for Class 11 Biology, and also provide the detail solution for each and every HOT Questions. HOT Questions will help to get more idea about question pattern in every exams and also will help to get more marks in Exams

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Std: 11th Standard CBSE - Biology

chapter: - HOT Questions

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Questions:

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10 x 2 = 20

In which plant will you look for mycorrhiza and coralloid roots?

Why are bryophytes called the amphibians of the plant kingdom?

How does pollination occur in gymnosperms and how the pollen grains approach ovules?

Why Seeds remain exposed in gymnosperms?

Why cycas is called a living fossil?

Why the name given double fertilisation to fertilisation in angiosperms?

Which event in pteridophytes is considered an important step in the evolution of seed habit in plants?

How does the natural system of classification provide detailed information about the groups?

Which system indicates evolutionarily as well as genetic relationships among organisms?

10.

Why the artificial system of classification was not considered reliable by the taxonomists?

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Answers Key:

Generic 2

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Mycorrhiza can be seen in Pinus and coralloid root in Cycas. Mycorrhiza – system association between the roots of higher plants & fungi.

They are found in damp, moist places as they require water for fertilization.

Pollination(by wind) in Gymnosperms is direct, as stigma is absent. the pollen grain reach the micropylar ends of ovules directly.

Seeds in gymnosperms remain exposed over the surface of the megasporophylls.This is because megasporophylls are not folded to form pistils like in angiosperms.

Cycas is a living representative of once a large group of gymnosperms which has became largely extinct.

The occurrence of two type of fertilisation in the same embryo sac is called double fertilisation that occurs in angiosperms.

The development to the Zygotes into young embryo takes place within the fgemale gametophytes is considered as percursor of seed habit.

This system is based on common characters of group of organisms, so it can give more or detailed information about the groups of organisms.

Phylogenetic system of classification

10.

The artificial system of classification was based only on gross morphological characters like habit, colour, number, shape of leaves, etc.