Plant Physiology Welcome to your Plant Physiology 1. In the mechanism of opening and closing of stomata, the important factor is The presence of Chloroplast in the guard cells The protein content of the cells The turgid and flaccid state of the guard cells The starch content of the cells2. Which of the following regulate closure of stomata? Auxins ABA Cytokinin Bromic acid3. A plant hormone for inducing Morphogenesis in plant tissue culture is Ethylene Cytokinin Abscisic acid Gibberellin4. When cell is fully turgid, which of the following will be zero? Wall pressure Osmotic pressure Turgor pressure Suction pressure(SP) or Diffusion pressure Deficit (DPD)5. A plant hormone related with inhibition of senescence is ABA Gibberellin Ethylene Bromic acid6. Which one of the following would not be a limiting factor for photosynthesis? Chlorophyll Oxygen Light Carbon dioxide7. Internodal elongation is associated with Gibberellin Cytokinin Auxin ABA8. Ethylene is used for Retarding ripening of tomatoes Hastening of ripening of fruits Both hastening of ripening of fruits and slowing down ripening of apples Slowing down ripening of apples9. A cell that lacks chloroplast does not Require water Evolve carbon dioxide Liberate oxygen Utilize carbohydrates10. The phytohormone that prevents the germination of seeds is Gibberellin Cytokinin Abscisic acid Auxin11. In hot summer days, plant cooling is due to Loss of water from entire plant Transport of water in plant Loss of water vapour from leaves Loss of liquid water12. Which one of these reaction occurs during photosynthesis? Carbon dioxide is reduced and water is oxidized Carbon dioxide and water both are reduced Carbon dioxide and water both are oxidized Water is reduced and Carbon dioxide is oxidized13. 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, dry atmosphere and moist soil Open stomata, high humid atmosphere and dry soil14. Water will be absorbed by the root hairs when: The plant is rapidly respiring None of the above Concentration of solutes in the cell sap is high Concentration of solutes in the soil is high15. Process of endosmosis stops When there is no light When the solution becomes isotonic When the water concentration becomes equal When the leaves fall16. Guttation is the elimination of excess of water from plants through Lenticels Wounds Hydathodes Stomata17. Osmosis involves Active absorption of water through roots All the above Cell to cell movement of water Movement of water through cortical cells18. The rate of photosynthesis is not affected by Light intensity Temperature Humidity Carbon dioxide concentration19. Plants lose water by guttation when Rate of transpiration is high 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 dry20. The hormone responsible for phototropism and geotropism is Enzyme Auxin Starch Gibberellin21. Marine fish when thrown under tap water bursts because of Plasmolysis Endosmosis Diffusion Exosmosis22. If the rate of transpiration becomes more than the rate of photosynthesis, plants will be killed instantly 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 available23. To increase sugar production in sugarcanes, they are sprayed with IAA Gibberellin Cytokinin ABA24. Compensation point means the condition 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 respiration When the entire food manufactured in photosynthesis remains unutilised25. 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 concentration26. Cell division in plants is promoted by Ethylene Gibberellin Cytokinin ABA27. Which one of the following pairs is not correctly matched? Gibberellic acid - Leaf fall Abscisic acid - Stomatal closure IAA - Cell wall elongation Cytokinin - Cell division28. Chlorophyll is present In the stroma of chloroplast Dispersed throughout the chloroplast On the surface of chloroplast In the grana of chloroplast29. 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 water30. One of the synthetic auxin is IBA NAA IAA GA31. In the process of Osmosis in a cell: Only outermost layer of protoplast acts as a membrane Both protoplasm and cell wall act as a membrane The entire protoplast acts as a membrane Only cell wall acts as a membrane32. 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 plant Ensure that starch is not translocated from the leaves Remove starch from the experimental leaf33. A phytohormone existing in gaseous state is Cytokinin Abscisic acid Auxin Ethylene34. Seeds when soaked in water imbibe in it because Seed coat contains lot of salts The process of absorption works Osmotic pressure inside the seed is low There are many vacuoles in the endosperm35. Which would do maximum harm to a tree? Loss of all of its leaves Loss of half of its branches Loss of half of its flowers Loss of a little bark36. The space between the cell wall and plasma membrane in a plasmolysed cell is filled with Water Hypertonic solution Isotonic solution Hypotonic solution37. The specific function of light energy in the process of photosynthesis is to Reduce carbondioxide Split water Activate chlorophyll Synthesize glucose38. Which of the following is not an effect of ethylene? Breaks seed and bud dormancy Helps to overcome apical dominance Promotes senescence and abscission of plant organs Hastens fruit ripening39. 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 wilting40. Positive geotropism is exhibited by Root Stem Shoot Leaves41. Stomata open during the day and close at night because Loss of starch in day time raises OP of subsidiary cells Loss of sugar increases osmotic concentration of the cell sap Photosynthesis occurs during day time only Enzymes convert starch into sugar at elevated pH in night42. The phytohormone that helps in the germination of seeds is Auxin Gibberellin ABA Cytokinin43. NADP is expanded as Nicotinamide adenine dinucleous phosphate Nicotinamide adenosine dinucleous phosphate Nicotinamide adenine dinucleotide phosphate Nicotinamide adenosine dinucleotide phosphate44. Transpiration is very low during the storms due to High velocity of wind Presence of moisture in the wind Low temperature during storms None of the above45. Plasma membrane controls Passage of water and solutes into the cell Movement of cell contents out of the cell Passage of water only Passage of water and solutes in and out of the cell46 out of 45Please fill in the comment box below.
