Physiology Of Plants Pathogens MCQs

By: Prof. Dr. Fazal Rehman | Last updated: May 14, 2025

1. : Transpiration is the least in
(A) Good soil moisture
(B) High wind velocity
(C) Dry environment
(D) High atmospheric humidity

2. : Phenyl mercuric acetate (PMA) results in
(A) Reduced photosynthesis
(B) Reduced transpiration
(C) Reduced respiration
(D) Killing of plants

3. : Stomata open and close due to
(A) Circadian rhythm
(B) Genetic clock
(C) A pressure of gases inside the leaves
(D) Turgor pressure of guard cells

4. : Movement of leaves of a sensitive plant, Mimosa pudica, is due to
(A) Thermonasty
(B) Seismonasty
(C) Hydrotropism
(D) Chemonasty

5. : Gibberellins promote
(A) Seed germination
(B) Seed dormancy
(C) Leaf fall
(D) Root elongation

6. : Carbon dioxide joins the photosynthetic pathway in
(A) PS I
(B) PS II
(C) Light reaction
(D) Dark reaction

7. : A very efficient converter of solar energy with the net productivity of 204 kg/m² or more is the crop
(A) Wheat
(B) Sugarcane
(C) Rice
(D) Bajra

8. : Which of the following movements is not related to auxin level?
(A) Bending of shoot towards light
(B) Movement of root towards the soil
(C) Nyctinastic leaf movements
(D) Movement of sunflower head tracking the sun

9. : Abscisic acid causes
(A) Stomatal closure
(B) Leaf expansion
(C) Stem elongation
(D) Root elongation

10. : Water movement between cells is due to
(A) T.P
(B) W.P
(C) D.P.D
(D) Incipient plasmolysis

11. : If the growing plant is decapitated, then
(A) Its growth stops
(B) Leaves become yellow and fall down
(C) Axillary buds are inactivated
(D) Axillary buds are activated

12. : Which of the following elements plays an important role in biological nitrogen fixation?
(A) Copper
(B) Molybdenum
(C) Zinc
(D) Manganese