Plant Physiology Welcome to your Plant Physiology 1. 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 low2. 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 cells3. Which one of the following would not be a limiting factor for photosynthesis? Chlorophyll Oxygen Light Carbon dioxide4. The hormone responsible for phototropism and geotropism is Starch Auxin Gibberellin Enzyme5. The specific function of light energy in the process of photosynthesis is to Split water Activate chlorophyll Reduce carbondioxide Synthesize glucose6. One of the synthetic auxin is IAA NAA IBA GA7. A cell that lacks chloroplast does not Evolve carbon dioxide Liberate oxygen Utilize carbohydrates Require water8. Plants lose water by guttation when Soil is wet and and the atmosphere is dry Soil is dry and and the atmosphere is dry Rate of transpiration is high Soil is wet and and the atmosphere is humid9. NADP is expanded as Nicotinamide adenine dinucleotide phosphate Nicotinamide adenine dinucleous phosphate Nicotinamide adenosine dinucleous phosphate Nicotinamide adenosine dinucleotide phosphate10. When cell is fully turgid, which of the following will be zero? Wall pressure Suction pressure(SP) or Diffusion pressure Deficit (DPD) Turgor pressure Osmotic pressure11. Osmosis involves Cell to cell movement of water Active absorption of water through roots Movement of water through cortical cells All the above12. In the process of Osmosis in a cell: Only cell wall acts as a membrane Only outermost layer of protoplast acts as a membrane Both protoplasm and cell wall act as a membrane The entire protoplast acts as a membrane13. Transpiration is very low during the storms due to Presence of moisture in the wind High velocity of wind Low temperature during storms None of the above14. To increase sugar production in sugarcanes, they are sprayed with ABA Gibberellin Cytokinin IAA15. Stomata open during the day and close at night because Enzymes convert starch into sugar at elevated pH in night 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 sap16. Transpiration pull will be maximum under which of the following conditions? Open stomata, high humid atmosphere and dry soil Closed stomata, dry atmosphere and dry soil Open stomata, high humid atmosphere and well irrigated soil Open stomata, dry atmosphere and moist soil17. Which one of the following pairs is not correctly matched? Gibberellic acid - Leaf fall Abscisic acid - Stomatal closure Cytokinin - Cell division IAA - Cell wall elongation18. 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 plant19. The production of starch and not glucose is often used as a measure of photosynthesis in leaves because Starch is an immediate of photosynthesis Glucose formed in photosynthesis soon gets converted into starch Sugar cannot be tested Starch is insoluble in water20. Positive geotropism is exhibited by Stem Leaves Shoot Root21. Plasma membrane controls Passage of water and solutes into the cell Passage of water and solutes in and out of the cell Passage of water only Movement of cell contents out of the cell22. Which of the following regulate closure of stomata? Bromic acid Cytokinin ABA Auxins23. Which one of these reaction occurs during photosynthesis? Water is reduced and Carbon dioxide is oxidized Carbon dioxide and water both are oxidized Carbon dioxide is reduced and water is oxidized Carbon dioxide and water both are reduced24. Which would do maximum harm to a tree? Loss of a little bark Loss of all of its leaves Loss of half of its flowers Loss of half of its branches25. Compensation point means the condition When the pot is watered just to meet the full requirement of the plant When the entire food manufactured in photosynthesis remains unutilised Where there is neither photosynthesis nor respiration When the rate of photosynthesis is equal to the rate of respiration26. The rate of photosynthesis is not affected by Carbon dioxide concentration Humidity Light intensity Temperature27. Which of the following is not an effect of ethylene? Helps to overcome apical dominance Breaks seed and bud dormancy Promotes senescence and abscission of plant organs Hastens fruit ripening28. Ethylene is used for Slowing down ripening of apples Retarding ripening of tomatoes Hastening of ripening of fruits Both hastening of ripening of fruits and slowing down ripening of apples29. A plant hormone related with inhibition of senescence is Gibberellin ABA Ethylene Bromic acid30. Guttation is the elimination of excess of water from plants through Hydathodes Stomata Lenticels Wounds31. The space between the cell wall and plasma membrane in a plasmolysed cell is filled with Hypotonic solution Hypertonic solution Isotonic solution Water32. 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 be killed instantly Grow more vigorously because more energy will be available33. Marine fish when thrown under tap water bursts because of Exosmosis Diffusion Plasmolysis Endosmosis34. Cell division in plants is promoted by ABA Cytokinin Gibberellin Ethylene35. When a plant wilts, the sequence of events is as follows: Exosmosis, deplasmolysis, plasmolysis, temporary and permanent wilting Exosmosis, plasmolysis, temporary and permanent wilting Exosmosis, plasmolysis, deplasmolysis, temporary wilting None of the above36. In hot summer days, plant cooling is due to Transport of water in plant Loss of liquid water Loss of water vapour from leaves Loss of water from entire plant37. The phytohormone that helps in the germination of seeds is Cytokinin ABA Auxin Gibberellin38. Osmosis involves diffusion of Molecules or ions from the more concentrated solution to the less concentrated solution Suspended particles from higher to lower concentration Suspended particles from lower to higher concentration Solvent particles from the less concentrated solution to the more concentrated solution39. A phytohormone existing in gaseous state is Auxin Cytokinin Abscisic acid Ethylene40. Water will be absorbed by the root hairs when: The plant is rapidly respiring Concentration of solutes in the cell sap is high Concentration of solutes in the soil is high None of the above41. Chlorophyll is present Dispersed throughout the chloroplast On the surface of chloroplast In the grana of chloroplast In the stroma of chloroplast42. A plant hormone for inducing Morphogenesis in plant tissue culture is Gibberellin Ethylene Cytokinin Abscisic acid43. The phytohormone that prevents the germination of seeds is Cytokinin Auxin Gibberellin Abscisic acid44. Process of endosmosis stops When the leaves fall When there is no light When the solution becomes isotonic When the water concentration becomes equal45. Internodal elongation is associated with Cytokinin ABA Gibberellin Auxin46 out of 45Please fill in the comment box below.
