Moderate

Stomata of a plant open due to:

Correct answer: A. Influx of potassium ions

  • A. Influx of potassium ions
  • B. Efflux of potassium ions
  • C. Influx of hydrogen ions
  • D. Influx of calcium ions.

Explanation

The mechanism of opening and closing of stomata is explained by active K + ion transport theory. So option A is correct.

Last updated

About Circulation

The circulatory system covers the chambers, valves and conducting pathway of the human heart, along with the cardiac cycle and control of heartbeat. It compares arteries, veins and capillaries by structure and function, and explains how the lymphatic system returns tissue fluid, transports absorbed fats and supports immunity.

Practise Circulation

695 free Circulation MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.

Exams that ask Biology questions like this

Biology is on 6 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.

Related questions