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B
Sieve tubes only
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C
Companion cells only
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D
Both sieve tubes and companion cells
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Solution
The correct option is D Both sieve tubes and companion cells Phloem in Gymnosperms lacks both sieve tube and companion cells. They only contain seive cells for conduction of food material and also have albuminous cells that have functions similar to that of companion cells.
So, the correct answer is 'Both sieve tubes and companion cells'