PLANT PHYSIOLOGY
TRANSPORT IN PLANT
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
What is the role of the companion cell?
|
|
To give structural support to the phloem vessels
|
|
|
To connect the phloem vessels to the xylem vessels
|
|
|
Their function is unknown
|
|
|
To act as “life support systems” for phloem cells which have lost most of their normal cell functions
|
Explanation:
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: -The function of companion cells, a type of parenchyma cells, is to support sieve elements by carrying out cell metabolism and regulation. Plasmodesmata are intercellular channels that connect sieve elements to the companion cells.
Detailed explanation-3: -Mainly, the sieve tubes and companion cells of phloem are involved in the loading and unloading of sucrose. Companion cells have a surface carrier protein that is responsible for the active transport from the mesophyll cells to the sieve tube.
There is 1 question to complete.