MHT CET Medical202624 April 2026Evening ShiftBiologyTransport in PlantsActual
Which of the following sets of conditions favour the opening of stomata?
Options
- AConversion of sugar to startch in guard cells, Formation of Potassium malate in the guard cells, Exosmosis in
- BConversion of startch to sugar in guard cells, Formation of Potassium malate in the guard cells, Endosmosis in
- CConversion of startch to sugar in guard cells, Formation of Potassium malate in the guard cells, Exosmosis in
- DConversion of sugar to startch in guard cells, Formation of Potassium malate in the guard cells, Exosmosis in
Correct answer
B. Conversion of startch to sugar in guard cells, Formation of Potassium malate in the guard cells, Endosmosis in
Step-by-step solution
The opening of stomata is an active process that depends on the turgidity of the guard cells. According to the active potassium ion transport theory, during the day, starch is converted into malic acid, which dissociates into malate and H ^+ ions. The H ^+ ions are actively pumped out of the guard cells, and K ^+ ions are taken in from the surrounding subsidiary cells. Cl ^- ions are also taken up to maintain electrical neutrality. The K ^+ ions combine with malate to form potassium malate. The accumulation of pota