PLANT PHYSIOLOGY
TRANSPORT IN PLANT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Transfer of sucrose into sieve elements, mass flow of sucrose through tubes, transfer of sucrose into storage
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Transfer of sucrose from storage, mass flow of sucrose through tubes, transfer of sucrose into sieve elements
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transfer of sucrose from sieve elements, mass flow of sucrose via sinks, transfer of sucrose into storage
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None of the above
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Detailed explanation-1: -(a) Sucrose is moved into the companion cells and then into the sieve tube by passive transport. (b) Inside the phloem, an osmotic pressure gradient is generated that facilitates the mass movement in the phloem. (c) Water in the adjacent xylem moves into the phloem by active process.
Detailed explanation-2: -(I) Water diffuses into the sieve tube elements. (II) Cells of the leaves produce sugar by photosynthesis. (III) Solutes are actively transported into the sieve elements. (IV) Sugar is transported from cell to cell in the leaf.
Detailed explanation-3: -sucrose, which is synthesised in leaves, is transported through phloem. its transport is bidirectional that is upwards as well as downwards .
Detailed explanation-4: -Sucrose moves from companion cells into sieve tube elements by active transport. This reduces the water potential of the sieve tube element. Water moves into the phloem by osmosis, which increases the hydrostatic pressure.
Detailed explanation-5: -Sugars produced in sources, such as leaves, need to be delivered to growing parts of the plant via the phloem in a process called translocation, or movement of sugar.