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Body Cavity

why companion...

Question

why companion cells are absent in gymnosperms and pteridophytes and what is used in place of companion cells in them?

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Solution

companion cells is a advance feature, as both gymnosperm and pteridophytes are primitive plants , so it is absent, while instead of it Albuminous cells are present.

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Q. In pteridophyta and gymnosperms, which cells are present in place of companion cell?

Q. Assertion :In gymnosperms, plants show well developed vessels and fibres Reason: Companion cells are absent in gymnosperm.

Q. Choose the correct statements:
A. Companion cells and sieve tubes are absent in pteridophytes.
B. Gametophyte of pteridophytes require cool, dry and shady places to grow.
C. Prothallus is found in Dryopteris.

Q. Read the following statements and select the correct ones.
(i). Phloem parenchyma is absent in most monocots
(ii). Gymnosperms lack tracheids and vessels
(iii). Gymnosperms lack companion cells

Q. Companion cells are absent in the phloem of

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