Question:
Heartwood differs from sapwood in
Heartwood differs from sapwood in
Updated On: Jul 12, 2022
- presence of rays and fibres
- absence of vessels and parenchyma
- having dead and non-conducting elements
- being susceptible to pests and pathogens.
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The Correct Option is C
Solution and Explanation
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 micro-organisms and insects. This region comprises dead elements with highly lignified walls and is called heartwood. The heartwood does not conduct water but it gives mechanical support to the stem. The peripheral region of the secondary xylem, is higher in colour and is known as the sapwood. It is involved in the conduction of water and minerals from root to leaf.
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Concepts Used:
Anatomy of Dicotyledonous and Monocotyledonous Plants
Dicot Root:
- Dicot plants have the taproot system.
- The outermost layer is called the epidermis. The epidermal cells sometimes project out which appear as the root hairs.
- The epidermis is followed by the multi-layered cortex, loosely made of the parenchyma cells with intercellular spaces.
- The inner layer of the cortex is called endodermis, which is tightly packed by the barrel shaped-cells.
- Endodermis is followed by pericycle, which are a few layers of thick-walled parenchyma cells.
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Monocot Root:
Monocot roots do not show much difference in the anatomy from that of the dicot roots.
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- The number of xylem in a monocot is six or more.
- Secondary growth is not seen in the monocot plants.