Arrange the following five events in an order that explains the mass flow of materials in the phloem.
1)Water diffuses into the sieve tubes.
2)Leaf cells produce sugar by photosynthesis.
3)Solutes are actively transported into sieve tubes.
4)Sugar is transported from cell to cell in the leaf.
5)Sugar moves down the stem.

Question

Quizplus · Accepted Answer

The correct sequence starts with leaf cells producing sugar by photosynthesis (2), then sugar is transported from cell to cell within the leaf (4). Next, solutes (including the produced sugars) are actively transported into sieve tubes (3), causing water to diffuse into the sieve tubes due to osmotic pressure (1), and finally, sugar (along with other solutes) moves down the stem (5).

Arrange the Following Five Events in an Order That Explains