STRUCTURAL ORGANISTION OF PLANTS AND ANIMALS
ANATOMY OF FLOWERING PLANTS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Both sieve tubes and companion cells
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Albuminous and sieve cells
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Sieve tubes only
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Companion cells only
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Detailed explanation-1: -The sieve tube and the associated cells are absent from the phloem of gymnosperms. Instead, they have sieve cells for the conduction of dietary materials. The phloem conductive element is the sieve element. Companion cells are cells that provide “life support” for the sieve’s function.
Detailed explanation-2: -Unlike angiosperms, gymnosperms do not have companion cells. They only have sieve cells for food conduction and albuminous cells that fulfill companion cell’s functions.
Detailed explanation-3: -Final answer: Phloem in gymnosperms lack both sieve tubes and companion cells.
Detailed explanation-4: -In Gymnosperms, the phloem lacks both the sieve tube and the corresponding cells. Instead they contain sieve cells for food material conduction. The Sieve element is the phloem conductive element.
Detailed explanation-5: -As vascular plants, gymnosperms contain two conducting tissues, the xylem and phloem.