PLANTS
TRANSPORT IN PLANTS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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To ensure more mineral ions diffuse into roots.
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To increase the surface area of roots.
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To ensure water potential in roots lower than in soils.
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Detailed explanation-1: -Plant roots absorb mineral salts including nitrates needed for healthy growth. For healthy growth plants need mineral ions including:-Nitrate for producing amino acids which are then used to form proteins.-Magnesium which is needed for chlorophyll production.
Detailed explanation-2: -They cannot be absorbed by diffusion, because the minerals are in very low concentration. Instead, active transport is used. The root hair cells have carrier proteins in their cell membranes. These pick up the mineral ions and move them across the membrane into the cell against the concentration gradient .
Detailed explanation-3: -The roots of a plant contain a high concentration of minerals and the soil contains a lower concentration. The roots absorb minerals from the soil. This is an example of passive transport.
Detailed explanation-4: -The nutrient ions must move from the outside to the inside of the root. This can’t occur by diffusion because the ion concentration inside the root is higher than the concentration outside it.