TestUstad
Moderate

Glycolate induces opening of stomata in:

Correct answer: B. Low CO2 concentration

  • A. Presence of oxygen
  • B. Low CO2 concentration
  • C. High CO2 concentration
  • D. CO2 absent

Explanation

Zelitch (1963) suggested that glycolic acid is formed in the guard cells. This acid is formed under a low concentration of CO. Glycolate formed gives rise to carbohydrates. Under this condition, the osmotically active material is produced and ATP synthesis also takes place. ATP is produced during the glyoxylate glycolate shuttle. This ATP helps in the active pumping of water in the guard cells and stomata open. Stomata close when this process is reversed. So option B 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.

Start a free Circulation testAll Circulation MCQs

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.

AKU Biology81 MCQsDUHS Biology81 MCQsETEA MDCAT Biology81 MCQsKMU Biology81 MCQsMDCAT Biology81 MCQsNUMS Biology55 MCQs

Related questions

1% of the absorbed water is used by plants in its activities during:

75% osmotic pressure of blood is maintained by:

A bottle filled with previously moistened mustard seeds and water was screw-capped tightly and kept in a corner. It blew up suddenly after about half an hour. The phenomenon involved is

A column of water within xylem vessels of tall trees does not break under its weight because of:

A destarched leaf on a potted plant was covered with Black (A) Transparent (B) strips of paper as shown in figure. After 6 hours of exposure to sunlight the leaf was removed from the plant and tested for starch. Which are the following will be the correct observation?