HORTICULTURE SCIENCE
PLANT BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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to move sugars into and out of the phloem
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to provide structural support fo the plant
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to pump water and minerals up the xylem
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to serve as a sink for manufactured sugars
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Detailed explanation-1: -Companion cells are found along with sieve tube elements in the phloem. The main function of companion cells is to maintain pressure gradient in the sieve tube elements.
Detailed explanation-2: -Glucose tends to move from an area of high concentration to an area of low concentration, a process called diffusion. Because the glucose transporter works with the concentration gradient, its process of moving glucose across the cell membrane is called facilitated diffusion.
Detailed explanation-3: -Phloem, the Medium for Plant Energy Transfer The sieve tubes permit the flow of sugar solution under the influence of a fluid pressure differential according to the pressure-flow theory. Phloem also contains companion cells for the sieve tubes which aid in the transport of sugars to the tubes.