Plant Physiology Welcome to your Plant Physiology 1. Transpiration is very low during the storms due to Low temperature during storms High velocity of wind None of the above Presence of moisture in the wind2. Osmosis involves diffusion of Molecules or ions from the more concentrated solution to the less concentrated solution Solvent particles from the less concentrated solution to the more concentrated solution Suspended particles from higher to lower concentration Suspended particles from lower to higher concentration3. One of the synthetic auxin is IAA NAA IBA GA4. Marine fish when thrown under tap water bursts because of Diffusion Endosmosis Exosmosis Plasmolysis5. Water will be absorbed by the root hairs when: Concentration of solutes in the soil is high Concentration of solutes in the cell sap is high The plant is rapidly respiring None of the above6. When cell is fully turgid, which of the following will be zero? Osmotic pressure Wall pressure Turgor pressure Suction pressure(SP) or Diffusion pressure Deficit (DPD)7. Stomata open during the day and close at night because Loss of sugar increases osmotic concentration of the cell sap Enzymes convert starch into sugar at elevated pH in night Photosynthesis occurs during day time only Loss of starch in day time raises OP of subsidiary cells8. A plant is kept in a dark cupbord for about 48 hours before conducting any experiment on photosynthesis to Remove chlorophyll from the leaf of the plant Ensure that starch is not translocated from the leaves Remove starch from the plant Remove starch from the experimental leaf9. Process of endosmosis stops When the water concentration becomes equal When the leaves fall When there is no light When the solution becomes isotonic10. The phytohormone that helps in the germination of seeds is ABA Cytokinin Auxin Gibberellin11. A phytohormone existing in gaseous state is Auxin Cytokinin Abscisic acid Ethylene12. When a plant wilts, the sequence of events is as follows: Exosmosis, plasmolysis, deplasmolysis, temporary wilting Exosmosis, plasmolysis, temporary and permanent wilting None of the above Exosmosis, deplasmolysis, plasmolysis, temporary and permanent wilting13. Which one of the following pairs is not correctly matched? Gibberellic acid - Leaf fall Abscisic acid - Stomatal closure Cytokinin - Cell division IAA - Cell wall elongation14. Transpiration pull will be maximum under which of the following conditions? Closed stomata, dry atmosphere and dry soil Open stomata, high humid atmosphere and dry soil Open stomata, dry atmosphere and moist soil Open stomata, high humid atmosphere and well irrigated soil15. Plants lose water by guttation when Soil is dry and and the atmosphere is dry Soil is wet and and the atmosphere is dry Soil is wet and and the atmosphere is humid Rate of transpiration is high16. Ethylene is used for Hastening of ripening of fruits Retarding ripening of tomatoes Slowing down ripening of apples Both hastening of ripening of fruits and slowing down ripening of apples17. If the rate of transpiration becomes more than the rate of photosynthesis, plants will Grow more vigorously because more energy will be available be killed instantly Stop growing and gradually die of starvation Continue to live, but will not be able to store food18. Which of the following regulate closure of stomata? Auxins Bromic acid ABA Cytokinin19. Chlorophyll is present Dispersed throughout the chloroplast On the surface of chloroplast In the stroma of chloroplast In the grana of chloroplast20. Cell division in plants is promoted by Ethylene ABA Cytokinin Gibberellin21. The hormone responsible for phototropism and geotropism is Gibberellin Enzyme Auxin Starch22. The space between the cell wall and plasma membrane in a plasmolysed cell is filled with Isotonic solution Hypotonic solution Water Hypertonic solution23. Which one of these reaction occurs during photosynthesis? Carbon dioxide and water both are reduced Carbon dioxide is reduced and water is oxidized Water is reduced and Carbon dioxide is oxidized Carbon dioxide and water both are oxidized24. Which would do maximum harm to a tree? Loss of all of its leaves Loss of half of its flowers Loss of half of its branches Loss of a little bark25. Internodal elongation is associated with ABA Gibberellin Cytokinin Auxin26. In hot summer days, plant cooling is due to Loss of water from entire plant Loss of water vapour from leaves Loss of liquid water Transport of water in plant27. A cell that lacks chloroplast does not Utilize carbohydrates Liberate oxygen Evolve carbon dioxide Require water28. A plant hormone related with inhibition of senescence is ABA Ethylene Bromic acid Gibberellin29. The phytohormone that prevents the germination of seeds is Gibberellin Abscisic acid Auxin Cytokinin30. Guttation is the elimination of excess of water from plants through Stomata Hydathodes Wounds Lenticels31. In the mechanism of opening and closing of stomata, the important factor is The turgid and flaccid state of the guard cells The starch content of the cells The protein content of the cells The presence of Chloroplast in the guard cells32. To increase sugar production in sugarcanes, they are sprayed with Gibberellin ABA Cytokinin IAA33. In the process of Osmosis in a cell: Only cell wall acts as a membrane Only outermost layer of protoplast acts as a membrane The entire protoplast acts as a membrane Both protoplasm and cell wall act as a membrane34. Plasma membrane controls Movement of cell contents out of the cell Passage of water and solutes into the cell Passage of water and solutes in and out of the cell Passage of water only35. The specific function of light energy in the process of photosynthesis is to Reduce carbondioxide Activate chlorophyll Synthesize glucose Split water36. Which one of the following would not be a limiting factor for photosynthesis? Oxygen Carbon dioxide Chlorophyll Light37. Osmosis involves Cell to cell movement of water Movement of water through cortical cells All the above Active absorption of water through roots38. The rate of photosynthesis is not affected by Light intensity Humidity Temperature Carbon dioxide concentration39. Compensation point means the condition When the rate of photosynthesis is equal to the rate of respiration When the entire food manufactured in photosynthesis remains unutilised When the pot is watered just to meet the full requirement of the plant Where there is neither photosynthesis nor respiration40. The production of starch and not glucose is often used as a measure of photosynthesis in leaves because Starch is an immediate of photosynthesis Starch is insoluble in water Glucose formed in photosynthesis soon gets converted into starch Sugar cannot be tested41. Seeds when soaked in water imbibe in it because There are many vacuoles in the endosperm The process of absorption works Osmotic pressure inside the seed is low Seed coat contains lot of salts42. Positive geotropism is exhibited by Stem Shoot Leaves Root43. NADP is expanded as Nicotinamide adenosine dinucleous phosphate Nicotinamide adenine dinucleous phosphate Nicotinamide adenine dinucleotide phosphate Nicotinamide adenosine dinucleotide phosphate44. Which of the following is not an effect of ethylene? Hastens fruit ripening Promotes senescence and abscission of plant organs Breaks seed and bud dormancy Helps to overcome apical dominance45. A plant hormone for inducing Morphogenesis in plant tissue culture is Abscisic acid Ethylene Cytokinin Gibberellin46 out of 45Please fill in the comment box below.