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Active Transport

Sucrose enter...

Question

Sucrose enters a phloem sieve-tube cell because of:

A

Osmosis

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B

Water potential

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C

Active transport

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D

A process regulated by auxin

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Solution

The correct option is C
Active transport

According to mass flow hypothesis, sucrose moves into the living phloem sieve tube cells by active transport. Active transport is a mode of transport which requires energy to go against the concentration gradient i.e, moving from a region of low concentration to a region of high concentration with the help of energy.

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Similar questions

Q. During phloem transportation sugar is moved in form of sucrose in to the companion cells and them into the living phloem sieve tube cells by -

What is the name of the process whereby sugar enters sieve tubes by means of active transport?

Q. Find the correct pair of statements :
(i) The influx of Cl into guard cells during stomatal opening is active.
(ii) Entry of sucrose from companion cells into sieve tubes at source involves the expenditure of energy.
(iii) At the sinks, sucrose moves out of phloem by passive transport.
(iv) Efflux of K

^{+}

from guard cells during stomatal closure does not involve energy expenditure.

Q. Assertion: Translocation of sucrose through phloem is a passive process.

Reason: Sucrose is pumped from leaves to sieve tubes at the expense of ATP.

Q. Which of the following statement substantiates the mass flow hypothesis?
I. Sugar is translocated from sink to source.
II. Glucose is converted to sucrose at the sink.
III. Osmosis enables the movement of sucrose into the sieve tubes, which generates a hypertonic condition in phloem.

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