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

Related Mcqs:

1. 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

2. 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

3. If the number of chromosomes in most body cells of a mammal is 40, the cells in the seminiferous tubule will have___________?

   A. 40 chromosomes
   B. 20 chromosomes
   C. 10 chromosomes
   D. While some other will have 20

   Submitted by: Rashid Mehmood

4. There are cells in human body called Faggot cells which cause__________?

   A. AIDS
   B. Tuberculosis
   C. Smallpox
   D. Leukaemia

   Submitted by: Ali Mallah

5. Megaphylls i.e. leaves with divided veins with an expanded lamina is a dharacteristic of ___________________?

   A. Lycopods
   B. Ferns
   C. Seed plants
   D. Both b and c

6. Chlorosis, i.e., yellowish hue on the leaves results from_____________?

   A. Accumulation of toxic waste products in leaves.
   B. Deficiency of chlorophyll.
   C. Short supplies of mineral nutrients in the soil.
   D. All of these

7. At which times there is no net gaseous exchange between leaves and the atmosphere.

   A. Day time.
   B. Night time.
   C. Dawn & Dusk.
   D. Mid night.

8. Which of the following constituent is/are maximum in the filtrate that leaves proximal convoluted tubules?

   A. Glucose
   B. Amino acids
   C. Nitrogenous waste
   D. All of these

9. Thick, waxy & leathery cuticle around leaves is present in___________?

   A. Hydrophytes
   B. Mesophytes
   C. Xerophytes
   D. Halophytes

10. Bifacial Leaves :

    A. Leaves of maze plant
    B. Leaves of mango plant
    C. Leaves of water lily
    D. None of these

    Submitted by: Name