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Question
Which type of fibers mainly occur in phloem?
Which type of fibers mainly occur in phloem?
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Solution
The correct option is A Libriform
Libriform fibers mainly occur in phloem. The walls of libriform cells are lignified, with occasional oblique pores. In hardwoods, the walls are greatly thickened, this is less true in softwoods. In some species, the cell walls are thin, holding live protoplast for long periods and containing nutrients (fats and starches). Sometimes, in their early stages of formation, libriform cells are divided by thin transverse septa that retain their living contents and nutrients for long periods. Libriform fibers developed evolutionarily from tracheids during the process of specialization of wood cells.
Hence, the correct option is A.
Libriform fibers mainly occur in phloem. The walls of libriform cells are lignified, with occasional oblique pores. In hardwoods, the walls are greatly thickened, this is less true in softwoods. In some species, the cell walls are thin, holding live protoplast for long periods and containing nutrients (fats and starches). Sometimes, in their early stages of formation, libriform cells are divided by thin transverse septa that retain their living contents and nutrients for long periods. Libriform fibers developed evolutionarily from tracheids during the process of specialization of wood cells.
Hence, the correct option is A.
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