Lesson eLearning

What is the main factor that allows water to rise in plant xylem vessels?

medium 2 marks Class 7 · Science · Transportation in Animals and Plants
Answer
The cohesion‑tension mechanism.

The correct answer is The cohesion‑tension mechanism. — Answer is The cohesion‑tension mechanism.

Step-by-step solution

  1. Define cohesion as the attraction between water molecules.
  2. Define tension as the negative pressure generated by transpiration.
  3. Explain that cohesion holds a continuous column of water.
  4. Explain that tension pulls the column upward.
  5. Conclude that cohesion‑tension allows water to rise.
  6. Answer is The cohesion‑tension mechanism.
Common mistake: Confusing it with capillary action.

Concept tested: Water transport in plants

Published · How this solution was prepared and checked

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