Botany - Anatomy of Flowering Plants Question with Solution | TestHub
In temperate regions, cambium is less active during the winter season and forms fewer xylary elements that have narrow vessels, this wood is called ____________.
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In the spring season, cambium is very active and produces a large number of xylary elements having vessels with wider cavities. The wood formed during this season is called spring wood or early wood. In winter, the cambium is less active and forms fewer xylary elements that have narrow vessels, and this wood is called autumn wood or late wood.
In old trees, the greater part of secondary xylem is dark brown due to deposition of organic compounds like tannins, resins, oils, gums, aromatic substances and essential oils in the central or innermost layers of the stem. These substances make it hard, durable and resistant to the attacks of microorganisms and insects. This region comprises dead elements with highly lignified walls and is called heartwood. The peripheral region of the secondary xylem, is lighter in colour and is known as the sapwood.
