The sieve tubes and companion cells are exceptional feature of

Gymnosperms

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Angiosperms

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Ferns

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Pteridophytes

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Solution

The correct option is B Angiosperms
Companion cells are present only in angiosperms. Companion cells are absent in pteridophytes and gymnosperms. Sieve cells occur in pteridophytes and gymnosperms, while sieve tubes occur in angiosperms.
So, the correct answer is 'Angiosperms'

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Both phloem sieve tube cells and xylem vessel cells are derived from same kind of precursor cells but at maturity they are different. What feature is unique to phloem sieve tube cells?

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The sieve tubes and companion cells are exceptional feature of

The correct option is B AngiospermsCompanion cells are present only in angiosperms. Companion cells are absent in pteridophytes and gymnosperms. Sieve cells occur in pteridophytes and gymnosperms, while sieve tubes occur in angiosperms.So, the correct answer is 'Angiosperms'

The correct option is B Angiosperms
Companion cells are present only in angiosperms. Companion cells are absent in pteridophytes and gymnosperms. Sieve cells occur in pteridophytes and gymnosperms, while sieve tubes occur in angiosperms.
So, the correct answer is 'Angiosperms'