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3. ABSORPTION BY ROOTS
• Introduction
3.1 Need of Water and Minerals For Plants
3.2 Characteristics of Roots For Absorbing Water
3.3 Modes of Absorption and Conduction of Water and Minerals
3.4 Ascent of Sap
3.5 Descent of Sap
• Key Points to Remember
• Key Terms
• Review Questions
Answers
Answer:
The ascent of sap in the xylem tissue of plants is the upward movement of water and minerals from the root to the crown. Xylem is a complex tissue consisting of living and non-living cells.
This mechanism is carried out without utilisation of metabolic energy. Here, only the roots act as an organ of absorption or passage. Hence, sometimes it is called water absorption 'through roots', rather than 'by' roots. The water will enter the plant via the root cells that can be found in the roots where mainly passive absorption occurs. Also, with the absorption of water, minerals and nutrients are also absorbed.
Explanation:
The ascent of sap in the xylem tissue of plants is the upward movement of water and minerals from the root to the crown. Xylem is a complex tissue consisting of living and non-living cells.