Sucrose moves into sieve tube elements by (1)Diffusion (2)Endosmosis (3) Active transport (4)Exosmosis
Answers
Explanation:
The sucrose diffuses through the plasmodesmata from the companion cells to the sieve tube elements. As a result, concentration of sucrose increases in the sieve tube elements. Water moves by osmosis from the nearby xylem in the same leaf vein. This increases the hydrostatic pressure of the sieve tube elements.
Answer: The correct answer to this question is (3) Active transport
Explanation:
The movement of dissolved substances like sucrose and amino acids from the parts of the plant where they are made to other parts of the plant where they are needed is known as translocation. The phloem, which are transport vessels composed of companion cells and sieve tube elements, is where translocation takes place.
Sources (such as the leaves) are the parts of the plant that make these substances, and sinks (such as the bulbs and roots) are the parts of the plant that store or use these substances. In order to store carbohydrates, sucrose is transformed into starch when it reaches a sink.
As a result, more sucrose enters the source as a result of this maintaining a concentration gradient between the sink and the source. Because translocation is an active process, it will be impaired if respiration is reduced or inhibited (for example, by using a respiratory toxin).
The pressure flow hypothesis is the name given to the method that sugars move from the source to the sink. Sucrose is made from glucose as it is made at the source. Active transport moves this into the companion cells and then into the living phloem sieve tube cells. Once more, active transport is required to get the sucrose out of the phloem sap and into the cells that will use it to make energy from it.
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