exchange and transport systems

Question 1

what is translocation in plants?

Answer 1

Translocation is the movement of organic compounds from where they are made at their source, to where they are required at their sink

Question 2

Describe the mass flow hypothesis for the mechanism of translocation in plants.

Answer 2

1. In source / leaf sugars actively transported into phloem;
2. By companion cells;
3. Lowers water potential of sieve cell / tube and water enters by osmosis;
4. Increase in pressure causes mass movement (towards sink / root);
5. Sugars used / converted in root for respiration for storage.

Question 3

what do phloem transport?

Answer 3

Phloem transports organic molecules such as the products of photosynthesis

Question 4

what do xylem transport?

Answer 4

Xylem transports water and minerals