Mention the living and non-living components of conducting tissues in plants.
Answers
Answer:
Explanation:
Xylem -the principal water-conducting tissue consisted of living and non-living cells. Wood is largely xylem. (Herbaceous plants also contain xylem but the volume is much less). Xylem is composed of tracheids (elongated tapered cells with walls that are hard and usually lignified, although not especially thick) and vessels (formed frommeristematic cells from which the cell contents and end walls have been dissolved). The water moves readily through the empty tracheid, flowing from cell to cell through the numerous pits between them. Vessel cells are lined up end to end and the series may be many feet long. Xylem is formed by differentiation of the apical meristems of root and shoot. In perennial woody plants, secondary xylem is also formed in the familiar annual rings. The spring wood consists of larger cells with thinner walls and appears lighter, or less dense than the summer wood.
Phloem - the principal food-conducting tissue. They are made up of specialized cells called sieve elements. Sieve elements are elongated living cells with thin cellulose walls through which the food is conducted from one part of the plant to another. The nucleus of the sieve cell disappears. Sieve cells are physically associated with companion cells which have the nucleus. In addition to sieve and companion cells, fibers and sclereids may be present in phloem. The fibers of hemp and flax are derived from the phloem tissue.
The phloem is not enduring, and the old phloem disintegrates in woody stems. The phloem is protected by special meristematic tissues (cork cambium) that produce parenchymatous tissue. Bark is composed of the phloem, corky tissue and other incidental tissues.
Explanation:
Xylem -the principal water-conducting tissue consisted of living and non-living cells. Wood is largely xylem. (Herbaceous plants also contain xylem but the volume is much less). ... Sieve elements are elongated living cells with thin cellulose walls through which the food is conducted from one part of the plant to another.
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