Multiple Choice
In an isotonic solution, how does water move in relation to the cell?
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6. The Membrane
Osmosis
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Which of the following is needed for water to be absorbed by the roots through osmosis?
A
A concentration gradient
B
High temperature
C
Active transport proteins
D
ATP energy
Verified step by step guidance1
Understand the concept of osmosis: Osmosis is the movement of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.
Identify the role of a concentration gradient in osmosis: A concentration gradient is necessary for osmosis to occur because it provides the potential for water to move from an area of higher water concentration (lower solute concentration) to an area of lower water concentration (higher solute concentration).
Evaluate the options given: High temperature, active transport proteins, and ATP energy are not directly involved in the process of osmosis. Osmosis is a passive process that does not require energy input or active transport mechanisms.
Recognize that a concentration gradient is the key factor: For water to be absorbed by the roots through osmosis, there must be a concentration gradient between the soil and the root cells.
Conclude that the correct answer is a concentration gradient: This gradient allows water to move into the roots, facilitating absorption without the need for additional energy or transport proteins.
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