Plant Physiology Welcome to your Plant Physiology 1. To increase sugar production in sugarcanes, they are sprayed with ABA Cytokinin IAA Gibberellin2. Which one of the following pairs is not correctly matched? Gibberellic acid - Leaf fall Cytokinin - Cell division IAA - Cell wall elongation Abscisic acid - Stomatal closure3. Guttation is the elimination of excess of water from plants through Lenticels Wounds Stomata Hydathodes4. When a plant wilts, the sequence of events is as follows: Exosmosis, plasmolysis, deplasmolysis, temporary wilting Exosmosis, deplasmolysis, plasmolysis, temporary and permanent wilting None of the above Exosmosis, plasmolysis, temporary and permanent wilting5. Plants lose water by guttation when Soil is wet and and the atmosphere is humid Soil is wet and and the atmosphere is dry Rate of transpiration is high Soil is dry and and the atmosphere is dry6. The space between the cell wall and plasma membrane in a plasmolysed cell is filled with Hypotonic solution Water Hypertonic solution Isotonic solution7. Water will be absorbed by the root hairs when: Concentration of solutes in the cell sap is high None of the above Concentration of solutes in the soil is high The plant is rapidly respiring8. Marine fish when thrown under tap water bursts because of Plasmolysis Diffusion Exosmosis Endosmosis9. Stomata open during the day and close at night because Loss of starch in day time raises OP of subsidiary cells Photosynthesis occurs during day time only Loss of sugar increases osmotic concentration of the cell sap Enzymes convert starch into sugar at elevated pH in night10. If the rate of transpiration becomes more than the rate of photosynthesis, plants will Continue to live, but will not be able to store food Grow more vigorously because more energy will be available be killed instantly Stop growing and gradually die of starvation11. Which of the following regulate closure of stomata? Bromic acid Cytokinin Auxins ABA12. The production of starch and not glucose is often used as a measure of photosynthesis in leaves because Glucose formed in photosynthesis soon gets converted into starch Sugar cannot be tested Starch is an immediate of photosynthesis Starch is insoluble in water13. In the mechanism of opening and closing of stomata, the important factor is The turgid and flaccid state of the guard cells The protein content of the cells The starch content of the cells The presence of Chloroplast in the guard cells14. Process of endosmosis stops When the solution becomes isotonic When there is no light When the leaves fall When the water concentration becomes equal15. Which one of these reaction occurs during photosynthesis? Carbon dioxide and water both are oxidized Water is reduced and Carbon dioxide is oxidized Carbon dioxide is reduced and water is oxidized Carbon dioxide and water both are reduced16. A plant is kept in a dark cupbord for about 48 hours before conducting any experiment on photosynthesis to Remove starch from the experimental leaf Ensure that starch is not translocated from the leaves Remove starch from the plant Remove chlorophyll from the leaf of the plant17. The specific function of light energy in the process of photosynthesis is to Split water Synthesize glucose Activate chlorophyll Reduce carbondioxide18. One of the synthetic auxin is IBA IAA GA NAA19. Osmosis involves diffusion of Suspended particles from higher to lower concentration 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 lower to higher concentration20. The rate of photosynthesis is not affected by Humidity Temperature Light intensity Carbon dioxide concentration21. Osmosis involves Cell to cell movement of water Movement of water through cortical cells All the above Active absorption of water through roots22. Plasma membrane controls Passage of water and solutes into the cell Movement of cell contents out of the cell Passage of water and solutes in and out of the cell Passage of water only23. Positive geotropism is exhibited by Stem Root Shoot Leaves24. NADP is expanded as Nicotinamide adenine dinucleous phosphate Nicotinamide adenosine dinucleous phosphate Nicotinamide adenosine dinucleotide phosphate Nicotinamide adenine dinucleotide phosphate25. Which of the following is not an effect of ethylene? Helps to overcome apical dominance Breaks seed and bud dormancy Hastens fruit ripening Promotes senescence and abscission of plant organs26. Which one of the following would not be a limiting factor for photosynthesis? Carbon dioxide Oxygen Light Chlorophyll27. The phytohormone that prevents the germination of seeds is Abscisic acid Gibberellin Cytokinin Auxin28. Transpiration is very low during the storms due to None of the above Low temperature during storms High velocity of wind Presence of moisture in the wind29. In the process of Osmosis in a cell: Both protoplasm and cell wall act as a membrane Only outermost layer of protoplast acts as a membrane The entire protoplast acts as a membrane Only cell wall acts as a membrane30. A phytohormone existing in gaseous state is Abscisic acid Cytokinin Auxin Ethylene31. A plant hormone related with inhibition of senescence is Bromic acid Gibberellin ABA Ethylene32. A cell that lacks chloroplast does not Utilize carbohydrates Evolve carbon dioxide Liberate oxygen Require water33. In hot summer days, plant cooling is due to Loss of water vapour from leaves Loss of water from entire plant Loss of liquid water Transport of water in plant34. The hormone responsible for phototropism and geotropism is Gibberellin Enzyme Starch Auxin35. Internodal elongation is associated with Cytokinin Gibberellin ABA Auxin36. Which would do maximum harm to a tree? Loss of half of its branches Loss of half of its flowers Loss of all of its leaves Loss of a little bark37. The phytohormone that helps in the germination of seeds is Cytokinin Gibberellin Auxin ABA38. Compensation point means the condition Where there is neither photosynthesis nor respiration When the rate of photosynthesis is equal to the rate of respiration When the pot is watered just to meet the full requirement of the plant When the entire food manufactured in photosynthesis remains unutilised39. Ethylene is used for Both hastening of ripening of fruits and slowing down ripening of apples Retarding ripening of tomatoes Slowing down ripening of apples Hastening of ripening of fruits40. Cell division in plants is promoted by Cytokinin ABA Gibberellin Ethylene41. Transpiration pull will be maximum under which of the following conditions? Closed stomata, dry atmosphere and dry soil Open stomata, high humid atmosphere and well irrigated soil Open stomata, high humid atmosphere and dry soil Open stomata, dry atmosphere and moist soil42. A plant hormone for inducing Morphogenesis in plant tissue culture is Ethylene Abscisic acid Gibberellin Cytokinin43. When cell is fully turgid, which of the following will be zero? Suction pressure(SP) or Diffusion pressure Deficit (DPD) Wall pressure Turgor pressure Osmotic pressure44. Chlorophyll is present Dispersed throughout the chloroplast On the surface of chloroplast In the stroma of chloroplast In the grana of chloroplast45. Seeds when soaked in water imbibe in it because The process of absorption works There are many vacuoles in the endosperm Seed coat contains lot of salts Osmotic pressure inside the seed is low46 out of 45Please fill in the comment box below.
