PLANTS
TRANSPORT IN PLANTS
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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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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: -The cotransport of a proton with sucrose allows movement of sucrose against its concentration gradient into the companion cells. occurs. From the companion cells, the sugar diffuses into the phloem sieve-tube elements through the plasmodesmata that link the companion cell to the sieve tube elements.
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: -So, the correct option is ‘Passive transport’