Glycolate induces the opening of stomata when:
1. Presence of oxygen
2. Low conc.
3. High
4. absent
Opening and closing of stomata are due to the:
1. Hormonal change in guard cells
2. Change in Turgor pressure of guard cells
3. Gaseous exchange
4. Respiration
Stomata of a plant open due to:
1. Influx of potassium ions
2. Efflux of potassium ions
3. Influx of hydrogen ions
4. Influx of calcium ions