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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is centrally located secondary xylem
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has deposits of tannin, resin, gum etc
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is very hard and durable
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Conducts water
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Detailed explanation-1: -It does not conduct water and minerals due to dead cells but provides mechanical support. Thus, the correct answer is option D.
Detailed explanation-2: -Hardwood provides mechanical support and does not conduct water. It is of dark colour because of deposition of chemicals like-tannins, resins, oils, etc.
Detailed explanation-3: -Sapwood and Heartwood Young xylem or sapwood conducts sap (primarily water), strengthens the stem, and to some extent serves as a storage reservoir for food.
Detailed explanation-4: -Heartwood is mechanically strong, resistant to decay, and less easily penetrated by wood-preservative chemicals than other types of wood. One or more layers of living and functional sapwood cells are periodically converted to heartwood. Thus, option A is correct.