Biology · Plant Physiology
Transpiration creates the major driving force for the ascent of sap in tall trees. However, during the night when stomata are closed, water still moves slowly upward. Which of the following best explains this nocturnal water movement?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Phloem transport replaces xylem transport during night hours
- 2Osmotic pressure of leaf mesophyll cells reverses at night to push water up
- 3Active transport by xylem vessels resumes only at night
- 4Cuticular transpiration and lenticular transpiration maintain a small but continuous pull even at night✓
Correct answer
Cuticular transpiration and lenticular transpiration maintain a small but continuous pull even at night
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