Question
Differentiate between heartwood and sap wood.
| Heartwood | Sap wood |
| 1. It is central region of secondary xylem (wood). | It is the peripheral region of secondary xylem (wood). |
| 2. It is darker in colour due to deposition of oils, gums, resins, tannins, etc | It is lighter in colour and without any depositions. |
| 3. It is non- functional part of secondary xylem. | It is functional part of secondary xylem. |
| 4. It is resistant to pathogens. | It is more susceptible to pathogens |
| 5. It is not involved in conduction of sap. | It is involved in conduction of sap. |
| 6. It is also called as duramen. | It is also called as alburnum. |
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| Column I (Phases) | Column II (Their events) |
| 1. Leptotene | (a) Crossing over |
| 2. Zygotene | (b) Desynapsis |
| 3. Pachytene | (c) Synapsis |
| 4. Diplotene | (d) Bouquet stage |