The mass flow hypothesis for translocation in plants involves active transport of sugars from leaves into the phloem, water entering sieve tube cells by osmosis due to reduced water potential, creating pressure for mass movement towards the sink where sugars are used or stored.
A hipótese do fluxo em massa para a translocação de açúcares nas plantas envolve o transporte ativo de açúcares das folhas para o floema, a entrada de água por osmose nas células-tubo crivo devido ao potencial hídrico reduzido, o que cria pressão para o movimento em massa para o local de armazenamento (sink), onde os açúcares são usados ou armazenados.
| Front | Describe the mass flow hypothesis for the mechanism of translocation in plants. [4 marks] |
|---|---|
| Back | 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; |
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