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Question
Assertion :Ions are absorbed from the soil by active transport only. Reason: The proteins present in the membranes of root hair cells passively pump ions from the soil into the cytoplasm of the epidermal cells.
Assertion :Ions are absorbed from the soil by active transport only. Reason: The proteins present in the membranes of root hair cells passively pump ions from the soil into the cytoplasm of the epidermal cells.
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Solution
The correct option is D Both Assertion and Reason are incorrect
Minerals are present in the soil in the form of ions. Ions cannot
directly cross the cell membrane. Ions are absorbed from the soil by
both passive and active (majorly) transport. Specific proteins in the
membranes of root hair cells and actively pump ions from the soil into
the cytoplasm of the epidermal cells. Like all cells, the endodermal
cells have many transport proteins embedded in their plasma membrane;
they let some solutes cross the membrane, but not others. Transport
proteins of endodermal cells are control points, where a plant adjusts
the quantity and types of solutes that reach the xylem.So, the correct answer is 'Both Assertion and Reason are incorrect'.
Minerals are present in the soil in the form of ions. Ions cannot
directly cross the cell membrane. Ions are absorbed from the soil by
both passive and active (majorly) transport. Specific proteins in the
membranes of root hair cells and actively pump ions from the soil into
the cytoplasm of the epidermal cells. Like all cells, the endodermal
cells have many transport proteins embedded in their plasma membrane;
they let some solutes cross the membrane, but not others. Transport
proteins of endodermal cells are control points, where a plant adjusts
the quantity and types of solutes that reach the xylem.
So, the correct answer is 'Both Assertion and Reason are incorrect'.
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