HORTICULTURE SCIENCE
ULTRA STRUCTURE OF PLANT CELLS AND ORGANS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Gas exchange in lower area of plant and soil
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Gas exchange
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Salt and water exchange between soil and roots
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Salt and water exchange between leaves and roots
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Detailed explanation-1: -The soil is at a lower concentration than the root hair cells. Hence, water moves from the soil to the root hair cells by the process of osmosis. Osmosis is the movement of water molecules from a region of low concentration to high concentration through a semipermeable membrane.
Detailed explanation-2: -Osmosis plays a central role in the movement of water between cells and various compartments within plants. In the absence of transpiration, osmotic forces dominate the movement of water into roots.
Detailed explanation-3: -Water and mineral salts first enter through the cell wall and cell membrane of the root hair cell by osmosis. The root hairs small diameter and greater length makes sure that they have a large surface area over which to absorb water and mineral salts. Water fills the vacuole of the root hair cell.