There are _________ hypothesis which may explain opening and closing of stomata?

Related Mcqs:

1. The opening and closing of stomata is directly controlled by the___________?

   A. Temperature
   B. pH
   C. Light
   D. None of these

2. There are _________ stomata per square cm of leaf surface in Tobacco plants?

   A. 1200
   B. 12000
   C. 100,000
   D. 1000

3. Low level of CO2 favours _________ of the stomata.

   A. Opening
   B. Closure
   C. Both of these
   D. None of these

4. Stomata open due to _________ of K+ into the guard cells from the surrounding epidermis

   A. Diffusion
   B. Active transport
   C. Osmosis
   D. All of these

5. Stomata cover only ______________ of leaf surface?

   A. 0.03 – 0.04%
   B. 10%
   C. 1-2 %
   D. 50%

6. The single main opening of the sponge cavity is____________?

   A. Osculum
   B. Ostia
   C. Spongocoel
   D. None of these

7. At the induction of action potential opening of Na+ gate with influx of Na+ is a ___________ processes?

   A. Active transport
   B. Passive transport
   C. Diffusion
   D. none of these

8. A series of hypothesis supported by the results of many tests is called ?

   A. Scientific law
   B. Theory
   C. Data
   D. Deduction

9. Van neil hypothesis about the production of oxygen during phosynthesis was based on the study and investigations on___________?

   A. Bacteria
   B. Algae
   C. Protenema
   D. Cyanobacteria

10. Sporangia of which of the following tracheopytes develop singly on the upper side of sporophylls which may or may not be arranged to form strobili_____________?

    A. Psilopsida
    B. Lycopsida
    C. Sphenopsida
    D. Prteropsida