Plant Physiology Welcome to your Plant Physiology 1. When a plant wilts, the sequence of events is as follows: Exosmosis, deplasmolysis, plasmolysis, temporary and permanent wilting None of the above Exosmosis, plasmolysis, temporary and permanent wilting Exosmosis, plasmolysis, deplasmolysis, temporary wilting2. Transpiration is very low during the storms due to Presence of moisture in the wind Low temperature during storms High velocity of wind None of the above3. The rate of photosynthesis is not affected by Carbon dioxide concentration Light intensity Temperature Humidity4. Internodal elongation is associated with ABA Auxin Cytokinin Gibberellin5. Which of the following regulate closure of stomata? ABA Cytokinin Auxins Bromic acid6. The hormone responsible for phototropism and geotropism is Starch Auxin Enzyme Gibberellin7. 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 Remove starch from the experimental leaf Remove starch from the plant Ensure that starch is not translocated from the leaves8. Compensation point means the condition When the entire food manufactured in photosynthesis remains unutilised 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 Where there is neither photosynthesis nor respiration9. Positive geotropism is exhibited by Leaves Shoot Root Stem10. A plant hormone for inducing Morphogenesis in plant tissue culture is Gibberellin Ethylene Cytokinin Abscisic acid11. The space between the cell wall and plasma membrane in a plasmolysed cell is filled with Hypotonic solution Water Hypertonic solution Isotonic solution12. Guttation is the elimination of excess of water from plants through Stomata Wounds Lenticels Hydathodes13. When cell is fully turgid, which of the following will be zero? Wall pressure Turgor pressure Suction pressure(SP) or Diffusion pressure Deficit (DPD) Osmotic pressure14. Osmosis involves Movement of water through cortical cells All the above Cell to cell movement of water Active absorption of water through roots15. To increase sugar production in sugarcanes, they are sprayed with ABA Gibberellin IAA Cytokinin16. In the process of Osmosis in a cell: The entire protoplast acts as a membrane Only outermost layer of protoplast acts as a membrane Only cell wall acts as a membrane Both protoplasm and cell wall act as a membrane17. Plasma membrane controls Passage of water only Passage of water and solutes into the cell Passage of water and solutes in and out of the cell Movement of cell contents out of the cell18. Stomata open during the day and close at night because Enzymes convert starch into sugar at elevated pH in night Loss of sugar increases osmotic concentration of the cell sap Photosynthesis occurs during day time only Loss of starch in day time raises OP of subsidiary cells19. 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 cells20. A cell that lacks chloroplast does not Evolve carbon dioxide Require water Liberate oxygen Utilize carbohydrates21. A plant hormone related with inhibition of senescence is Bromic acid ABA Ethylene Gibberellin22. Cell division in plants is promoted by Ethylene ABA Gibberellin Cytokinin23. The production of starch and not glucose is often used as a measure of photosynthesis in leaves because Sugar cannot be tested Glucose formed in photosynthesis soon gets converted into starch Starch is insoluble in water Starch is an immediate of photosynthesis24. Transpiration pull will be maximum under which of the following conditions? Open stomata, high humid atmosphere and dry soil Open stomata, dry atmosphere and moist soil Closed stomata, dry atmosphere and dry soil Open stomata, high humid atmosphere and well irrigated soil25. NADP is expanded as Nicotinamide adenine dinucleotide phosphate Nicotinamide adenosine dinucleotide phosphate Nicotinamide adenosine dinucleous phosphate Nicotinamide adenine dinucleous phosphate26. Which would do maximum harm to a tree? Loss of a little bark Loss of all of its leaves Loss of half of its branches Loss of half of its flowers27. A phytohormone existing in gaseous state is Abscisic acid Ethylene Auxin Cytokinin28. Which one of the following would not be a limiting factor for photosynthesis? Light Chlorophyll Carbon dioxide Oxygen29. Water will be absorbed by the root hairs when: Concentration of solutes in the soil is high The plant is rapidly respiring None of the above Concentration of solutes in the cell sap is high30. Ethylene is used for Both hastening of ripening of fruits and slowing down ripening of apples Hastening of ripening of fruits Retarding ripening of tomatoes Slowing down ripening of apples31. Marine fish when thrown under tap water bursts because of Diffusion Endosmosis Plasmolysis Exosmosis32. The phytohormone that helps in the germination of seeds is ABA Auxin Gibberellin Cytokinin33. Osmosis involves diffusion of Solvent particles from the less concentrated solution to the more concentrated solution Suspended particles from lower to higher concentration Molecules or ions from the more concentrated solution to the less concentrated solution Suspended particles from higher to lower concentration34. The phytohormone that prevents the germination of seeds is Cytokinin Gibberellin Abscisic acid Auxin35. Plants lose water by guttation when Soil is wet and and the atmosphere is humid Soil is wet and and the atmosphere is dry Soil is dry and and the atmosphere is dry Rate of transpiration is high36. In hot summer days, plant cooling is due to Loss of water vapour from leaves Loss of liquid water Loss of water from entire plant Transport of water in plant37. Which one of the following pairs is not correctly matched? Gibberellic acid - Leaf fall Abscisic acid - Stomatal closure IAA - Cell wall elongation Cytokinin - Cell division38. The specific function of light energy in the process of photosynthesis is to Activate chlorophyll Synthesize glucose Reduce carbondioxide Split water39. One of the synthetic auxin is IBA IAA GA NAA40. Process of endosmosis stops When there is no light When the solution becomes isotonic When the water concentration becomes equal When the leaves fall41. Which one of these reaction occurs during photosynthesis? Carbon dioxide is reduced and water is oxidized Water is reduced and Carbon dioxide is oxidized Carbon dioxide and water both are reduced Carbon dioxide and water both are oxidized42. If the rate of transpiration becomes more than the rate of photosynthesis, plants will Stop growing and gradually die of starvation Continue to live, but will not be able to store food Grow more vigorously because more energy will be available be killed instantly43. Seeds when soaked in water imbibe in it because Osmotic pressure inside the seed is low The process of absorption works There are many vacuoles in the endosperm Seed coat contains lot of salts44. Chlorophyll is present On the surface of chloroplast Dispersed throughout the chloroplast In the grana of chloroplast In the stroma of chloroplast45. Which of the following is not an effect of ethylene? Helps to overcome apical dominance Promotes senescence and abscission of plant organs Hastens fruit ripening Breaks seed and bud dormancy46 out of 45Please fill in the comment box below.
