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In flowering plants, vascular tissues originate from the plerome. The plerome is the central part of the primary meristem responsible for forming all the cells of the stele, starting from the pericycle inward.

1. The process of vascularization in plants refers to the formation of vascular bundles, which arise from the cambium.
2. Accurate statement: The outermost layer of secondary xylem is referred to as sapwood.
3. The outer secondary xylem, known as sapwood, is involved in water transport, while the inner heartwood consists of non-living but structurally supportive primary xylem.
4. The development of xylem starts when the actively dividing cells at the tips of roots and shoots (apical meristems) produce primary xylem.

Correct answer: The development of xylem starts when the actively dividing cells at the tips of roots and shoots (apical meristems) produce primary xylem.

Solution

Xylem in primary growth originates from apical meristems, which generate primary tissues at root and shoot tips. The other choices confuse primary growth with cambium-driven secondary growth or misdescribe sapwood and heartwood.

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