NEET 2012 Biology question

Gymnosperms are also called soft wood spermatophytes because they lack

(1)Xylem fibresCorrect
(2)Cambium
(3)Phloem fibres
(4)Thick-walled tracheids

Answer: (1)

Solution

The wood of gymnosperms (for example pine, deodar) is called soft wood because its xylem consists almost entirely of tracheids and rays: it has no vessels and no xylem fibres, which are the thick, heavily lignified cells that make the wood of angiosperms hard (hard wood). Lack of xylem fibres is therefore the reason

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Question ID VK-091209