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Question
Sugar transport elements of gymnosperms and pteridophytes are
Sugar transport elements of gymnosperms and pteridophytes are
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Solution
The correct option is D Sieve cells
Sieve cells are elongated, a food-conducting cell in phloem characteristic of gymnosperms and ferns, having pores but lacking sieve plates. Sieve cells are long, slender, conducting cells of the phloem that do not form a constituent element of a sieve tube, but which are provided with relatively unspecialized sieve areas, especially in the tapering ends of the cells that overlap those of other sieve cells. Sieve cells are typically associated with gymnosperms because angiosperms have the more derived sieve tube members and companion cells in their phloem. They have a narrower diameter and are more elongated compared to sieve tube members. Sieve cells are associated with albuminous cells, which lack starch, thus making it possible to differentiate them from phloem parenchyma. Thus, option A is correct.
Sieve cells are elongated, a food-conducting cell in phloem characteristic of gymnosperms and ferns, having pores but lacking sieve plates.
Sieve cells are long, slender, conducting cells of the phloem that do not form a constituent element of a sieve tube, but which are provided with relatively unspecialized sieve areas, especially in the tapering ends of the cells that overlap those of other sieve cells.
Sieve cells are typically associated with gymnosperms because angiosperms have the more derived sieve tube members and companion cells in their phloem. They have a narrower diameter and are more elongated compared to sieve tube members.
Sieve cells are associated with albuminous cells, which lack starch, thus making it possible to differentiate them from phloem parenchyma. Thus, option A is correct.
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