Plant Water and Mineral Movement Explained
The question asks about the mechanism responsible for the upward transport of water and minerals within plants. This essential process occurs through the plant's vascular tissues.
Key Mechanisms Driving Upward Transport
- Transpiration Pull: This is the primary driving force. Water evaporates from the surface of leaves through tiny pores called stomata. This evaporation creates a negative pressure, or 'tension', in the xylem vessels, effectively pulling the water column upwards from the roots.
- Root Pressure: Minerals are actively transported into the root xylem. This increases the concentration of solutes in the xylem sap, lowering its water potential. Consequently, water moves by osmosis from the soil into the root xylem, generating a positive pressure that pushes the water column slightly upwards.
Together, transpiration pull (a passive process driven by evaporation) and root pressure (an active process driven by mineral uptake) ensure the continuous upward movement of water and dissolved minerals from the soil, through the roots and stem, to the leaves.
Important Questions from Botany
One advantage of sexual reproduction over asexual reproduction is that it helps species to survive over long evolutionary time. This is because sexual reproduction produces :
During a laboratory experiment, a student immerses epidermal leaf peel in a hypertonic solution. After some time, the student examined the cells under a microscope and observed that:
The breakdown of glucose in cytoplasm results in the formation of
After fertilization, the fruit and the seed are produced by
- Which one of the following groups is called 'amphibians of plant kingdom'?
