LABORATORY REVIEW
TRANSPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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sucrose is transported due to a negative pressure in a source
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large volumes of solution are transported from an area of high hydrostatic pressure
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water travels from a high to low concentration
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sucrose diffuses to all cells equally
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Detailed explanation-1: -The mass flow hypothesis is a theory which attempts to explain how solutes are transported from source cells into sinks through the phloem. It isn’t concrete, but it is the best-accepted theory we currently have based on the available evidence.
Detailed explanation-2: -The pressure flow hypothesis introduced by Ernst Münch in 1930 describes a mechanism of osmotically generated pressure differentials that are supposed to drive the movement of sugars and other solutes in the phloem, but this hypothesis has long faced major challenges.
Detailed explanation-3: -The Pressure-Flow Hypothesis It proposes that water containing food molecules flows under pressure through the phloem. The pressure is created by the difference in water concentration of the solution in the phloem and the relatively pure water in the nearby xylem ducts.
Detailed explanation-4: -According to the pressure flow hypothesis, food is prepared in the plant leaves in the form of glucose. Before moving into the source cells present in the phloem, the prepared food is converted into sucrose.