Physiology Of Plants Pathogens MCQsBy: Prof. Dr. Fazal Rehman | Last updated: May 14, 2025 12 Score: 0 Attempted: 0/12 Subscribe 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 Read More MCQs of Botany SET 1: Botany MCQs SET 2: Botany MCQs SET 3: Botany MCQs SET 4: Botany MCQs Plant Kingdom MCQs Physiology Of Plants Pathogens MCQs Related Posts:Common Pathogens and Infections MCQsDiversity of plants and related life MCQsMCQs on morphology of flowering plantsMCQs Of Biology - Plants GrowthResearch Topics Mushroom culture and medicinal plantsSpeech about Plants [1,2,3,5 Minutes]