Plant Physiology Welcome to your Plant Physiology 1. When a plant wilts, the sequence of events is as follows: None of the above Exosmosis, plasmolysis, temporary and permanent wilting Exosmosis, plasmolysis, deplasmolysis, temporary wilting Exosmosis, deplasmolysis, plasmolysis, temporary and permanent wilting2. Which of the following regulate closure of stomata? Auxins Bromic acid Cytokinin ABA3. The hormone responsible for phototropism and geotropism is Starch Enzyme Gibberellin Auxin4. A cell that lacks chloroplast does not Require water Liberate oxygen Utilize carbohydrates Evolve carbon dioxide5. Chlorophyll is present Dispersed throughout the chloroplast In the grana of chloroplast In the stroma of chloroplast On the surface of chloroplast6. Water will be absorbed by the root hairs when: The plant is rapidly respiring None of the above Concentration of solutes in the soil is high Concentration of solutes in the cell sap is high7. A plant hormone related with inhibition of senescence is Bromic acid Ethylene Gibberellin ABA8. Internodal elongation is associated with ABA Cytokinin Auxin Gibberellin9. One of the synthetic auxin is NAA IBA GA IAA10. 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 Continue to live, but will not be able to store food Stop growing and gradually die of starvation11. The rate of photosynthesis is not affected by Temperature Carbon dioxide concentration Humidity Light intensity12. To increase sugar production in sugarcanes, they are sprayed with ABA Cytokinin Gibberellin IAA13. The specific function of light energy in the process of photosynthesis is to Reduce carbondioxide Activate chlorophyll Split water Synthesize glucose14. Stomata open during the day and close at night because Loss of sugar increases osmotic concentration of the cell sap Loss of starch in day time raises OP of subsidiary cells Enzymes convert starch into sugar at elevated pH in night Photosynthesis occurs during day time only15. Seeds when soaked in water imbibe in it because Seed coat contains lot of salts There are many vacuoles in the endosperm The process of absorption works Osmotic pressure inside the seed is low16. The production of starch and not glucose is often used as a measure of photosynthesis in leaves because Starch is an immediate of photosynthesis Sugar cannot be tested Glucose formed in photosynthesis soon gets converted into starch Starch is insoluble in water17. The phytohormone that prevents the germination of seeds is Abscisic acid Auxin Cytokinin Gibberellin18. The phytohormone that helps in the germination of seeds is Gibberellin ABA Auxin Cytokinin19. 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 concentration20. Cell division in plants is promoted by Cytokinin Ethylene ABA Gibberellin21. In the process of Osmosis in a cell: Only cell wall acts as a membrane Both protoplasm and cell wall act as a membrane Only outermost layer of protoplast acts as a membrane The entire protoplast acts as a membrane22. Which one of these reaction occurs during photosynthesis? Carbon dioxide and water both are reduced Water is reduced and Carbon dioxide is oxidized Carbon dioxide is reduced and water is oxidized Carbon dioxide and water both are oxidized23. NADP is expanded as Nicotinamide adenine dinucleous phosphate Nicotinamide adenosine dinucleous phosphate Nicotinamide adenosine dinucleotide phosphate Nicotinamide adenine dinucleotide phosphate24. 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, dry atmosphere and moist soil Open stomata, high humid atmosphere and well irrigated soil25. Process of endosmosis stops When the leaves fall When the water concentration becomes equal When there is no light When the solution becomes isotonic26. Which one of the following pairs is not correctly matched? Cytokinin - Cell division Abscisic acid - Stomatal closure IAA - Cell wall elongation Gibberellic acid - Leaf fall27. Transpiration is very low during the storms due to Presence of moisture in the wind Low temperature during storms None of the above High velocity of wind28. Which of the following is not an effect of ethylene? Hastens fruit ripening Helps to overcome apical dominance Breaks seed and bud dormancy Promotes senescence and abscission of plant organs29. Positive geotropism is exhibited by Stem Root Leaves Shoot30. In the mechanism of opening and closing of stomata, the important factor is The turgid and flaccid state of the guard cells The presence of Chloroplast in the guard cells The protein content of the cells The starch content of the cells31. 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 leaves32. Which would do maximum harm to a tree? Loss of all of its leaves Loss of half of its flowers Loss of a little bark Loss of half of its branches33. When cell is fully turgid, which of the following will be zero? Osmotic pressure Turgor pressure Wall pressure Suction pressure(SP) or Diffusion pressure Deficit (DPD)34. The space between the cell wall and plasma membrane in a plasmolysed cell is filled with Isotonic solution Hypertonic solution Water Hypotonic solution35. Which one of the following would not be a limiting factor for photosynthesis? Light Chlorophyll Oxygen Carbon dioxide36. A plant hormone for inducing Morphogenesis in plant tissue culture is Cytokinin Gibberellin Ethylene Abscisic acid37. Marine fish when thrown under tap water bursts because of Exosmosis Diffusion Endosmosis Plasmolysis38. Ethylene is used for Hastening of ripening of fruits Slowing down ripening of apples Retarding ripening of tomatoes Both hastening of ripening of fruits and slowing down ripening of apples39. In hot summer days, plant cooling is due to Transport of water in plant Loss of liquid water Loss of water from entire plant Loss of water vapour from leaves40. 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 respiration41. 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 only42. Osmosis involves All the above Movement of water through cortical cells Cell to cell movement of water Active absorption of water through roots43. Plants lose water by guttation when Soil is wet and and the atmosphere is dry Soil is dry and and the atmosphere is dry Soil is wet and and the atmosphere is humid Rate of transpiration is high44. A phytohormone existing in gaseous state is Auxin Cytokinin Ethylene Abscisic acid45. Guttation is the elimination of excess of water from plants through Hydathodes Wounds Stomata Lenticels46 out of 45Please fill in the comment box below.
