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

Related Mcqs:

1. Stoma, found in the epidermis of leaves closes when guard cells

   A. Gain Water
   B. Lose Water
   C. Exchange gas
   D. None of These

   Submitted by: Rana usama Ibrahim

2. An association in which fungal hyphae penetrate the outer cells of the plant root forming coils swellings and minute branches and also extend out into surrounding soil is called______________?

   A. Mycorrizael association
   B. Endomycorrhizae
   C. Ectomycorrhizae
   D. Lichen

3. Guard cells of stoma are ________ ?

   A. Irregular in shape
   B. Convex in shape
   C. Long and cylindrical in shape
   D. Kidney-shaped

   Submitted by: Rashid Mehmood

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

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

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

   A. One
   B. Two
   C. Three
   D. Four

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

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

7. Stomata cover only ______________ of leaf surface?

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

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

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

9. Fibrous capsule surrounding synovial joints may be thickened at some places to form:

   A. Synovial membrane.
   B. Ligaments.
   C. Muscles.
   D. Tendon

10. Marine fish can keep their internal environment hypertonic with respect to the surrounding salty water by retaining.

    A. Excessive urea which will increase their internal solute concentration and prevent body shrinkage in hypertonic environment
    B. Trimethyl alanine
    C. Ammonia
    D. Trimethylamine oxide