Multiple choice

The leaf of Mimosa on touching becomes flaccid and drops down. This is because

  1. cells of pulvini lose their turgor

  2. cells of abaxial surface shrink

  3. witing of cells take place due to excess water loss

  4. none of these

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A Correct answer
Explanation

Mimosa pudica's leaf folding response (thigmonasty) occurs due to rapid turgor pressure changes in pulvini cells - specialized motor cells at leaf bases. When touched, potassium ions exit these cells, water follows, and turgor drops.