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

1

(a)

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

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

1

(a)

Phylogenetic system of classification

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

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(a)

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

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

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(a)

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

Why the name given double fertilisation to fertilisation in angiosperms?

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(a)

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

Why cycas is called a living fossil?

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(a)

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

Why Seeds remain exposed in gymnosperms?

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(a)

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

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

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(a)

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

Why are  bryophytes called the amphibians of the plant kingdom?

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(a)

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

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

1

(a)

Cycas