CAPE Biology Unit 2 · 2013 · Paper 1 · Question Q19

Which of the following statements is true according to the mass (pressure) flow hypothesis?

1. (A)Sucrose moves in the phloem against a concentration gradient.
2. (B)The loading of sugars into the phloem in the leaf is achieved by osmosis.
3. (C)A source is a site where sugars are utilized, while a sink is a site where sugars are produced.
4. (D)Water is actively transported from the intercellular spaces into the cell sap at the root end of the system.