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Plant Kingdom

Question
CBSEENBI11002410
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The chief water conducting elements of xylem in gymnosperms are 

  • vessels

  • fibres

  • tansfusion tissue

  • tracheids

Solution

D.

tracheids

The tracheids are elongated, angular dead cells with hard lignified wide lumen and narrow end walls. The walls of tracheids posses different types of thickenings and the unthickened areas of its wall allow the rapid movement of water from one tracheid to another. Tracheids are the characteristic cells types of xylem tissue in gymnosperms and pteridophytes, where they are chief elements of water conduction.

Some More Questions From Plant Kingdom Chapter

What is the basis of classification of algae?

When and where does reduction division take place in the life cycle of a liverwort, a moss, a fern, a gymnosperm and an angiosperm?

Name three groups of plants that bear archegonia. Briefly describe the life cycle of any one of them.

Mention the ploidy of the following: protonemal cell of a moss; primary endosperm nucleus in dicot, leaf cell of a moss; prothallus cell of a ferm; gemma cell in Marchantia; meristem cell of monocot, ovum of a liverwort, and zygote of a fern.

Write a note on economic importance of algae and gymnosperms.

Both gymnosperms and angiosperms bear seeds, then why are they classified separately? 

What is heterospory? Briefly comment on its significance. Give two examples.

Explain briefly the following terms with suitable examples:
(i) protonema
(ii) antheridium
(iii) archegonium
(iv) diplontic
(v) sporophyll
(vi) isogamy

Differentiate between the following:
Red algae and brown algae

Differentiate between the following:
liverworts and moss

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