Multiple choice

Active K+ exchange mechanism for opening and closing of stomata was given by

  1. Darwin

  2. Levitt

  3. Scarth

  4. Khorana
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Levitt (1974) proposed the K+ ion exchange hypothesis for stomatal movement - K+ ions actively move into guard cells to open stomata (increasing turgor) and exit to close them. Darwin studied phototropism, Scarth worked on stomatal physiology earlier, and Khorana is known for genetic code research.

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