Multiple choice

At the sink the osmotic pressure must be

  1. Increased

  2. Reduced

  3. Both

  4. None

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to the pressure flow hypothesis, sugar is unloaded at the sink, which lowers the osmotic pressure. This reduction in osmotic pressure causes water to leave the phloem, decreasing the turgor pressure.