Plant Physiology Welcome to your Plant Physiology 1. Positive geotropism is exhibited by Shoot Root Stem Leaves2. Marine fish when thrown under tap water bursts because of Plasmolysis Diffusion Exosmosis Endosmosis3. Which of the following regulate closure of stomata? Cytokinin Auxins Bromic acid ABA4. The space between the cell wall and plasma membrane in a plasmolysed cell is filled with Hypertonic solution Hypotonic solution Isotonic solution Water5. When a plant wilts, the sequence of events is as follows: Exosmosis, plasmolysis, temporary and permanent wilting Exosmosis, deplasmolysis, plasmolysis, temporary and permanent wilting None of the above Exosmosis, plasmolysis, deplasmolysis, temporary wilting6. 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 unutilised7. The rate of photosynthesis is not affected by Light intensity Carbon dioxide concentration Humidity Temperature8. The specific function of light energy in the process of photosynthesis is to Synthesize glucose Split water Reduce carbondioxide Activate chlorophyll9. Seeds when soaked in water imbibe in it because There are many vacuoles in the endosperm The process of absorption works Osmotic pressure inside the seed is low Seed coat contains lot of salts10. A phytohormone existing in gaseous state is Ethylene Auxin Cytokinin Abscisic acid11. In hot summer days, plant cooling is due to Loss of water from entire plant Transport of water in plant Loss of liquid water Loss of water vapour from leaves12. Chlorophyll is present On the surface of chloroplast Dispersed throughout the chloroplast In the grana of chloroplast In the stroma of chloroplast13. Which would do maximum harm to a tree? Loss of half of its flowers Loss of all of its leaves Loss of a little bark Loss of half of its branches14. The phytohormone that helps in the germination of seeds is ABA Cytokinin Gibberellin Auxin15. To increase sugar production in sugarcanes, they are sprayed with Gibberellin IAA Cytokinin ABA16. Ethylene is used for Hastening of ripening of fruits Retarding ripening of tomatoes Slowing down ripening of apples Both hastening of ripening of fruits and slowing down ripening of apples17. A plant hormone for inducing Morphogenesis in plant tissue culture is Ethylene Abscisic acid Gibberellin Cytokinin18. Plasma membrane controls Movement of cell contents out of the cell Passage of water only Passage of water and solutes in and out of the cell Passage of water and solutes into the cell19. Which of the following is not an effect of ethylene? Promotes senescence and abscission of plant organs Breaks seed and bud dormancy Helps to overcome apical dominance Hastens fruit ripening20. Internodal elongation is associated with Cytokinin Gibberellin Auxin ABA21. A cell that lacks chloroplast does not Require water Evolve carbon dioxide Utilize carbohydrates Liberate oxygen22. In the process of Osmosis in a cell: Only outermost layer of protoplast acts as a membrane The entire protoplast acts as a membrane Both protoplasm and cell wall act as a membrane Only cell wall acts as a membrane23. 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 Ensure that starch is not translocated from the leaves Remove starch from the experimental leaf Remove starch from the plant24. Water will be absorbed by the root hairs when: The plant is rapidly respiring Concentration of solutes in the soil is high None of the above Concentration of solutes in the cell sap is high25. Osmosis involves Movement of water through cortical cells Cell to cell movement of water Active absorption of water through roots All the above26. The hormone responsible for phototropism and geotropism is Enzyme Gibberellin Auxin Starch27. In the mechanism of opening and closing of stomata, the important factor is The starch content of the cells The presence of Chloroplast in the guard cells The protein content of the cells The turgid and flaccid state of the guard cells28. Which one of the following pairs is not correctly matched? Abscisic acid - Stomatal closure Gibberellic acid - Leaf fall Cytokinin - Cell division IAA - Cell wall elongation29. 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 be killed instantly Stop growing and gradually die of starvation Grow more vigorously because more energy will be available30. Process of endosmosis stops When the leaves fall When there is no light When the water concentration becomes equal When the solution becomes isotonic31. One of the synthetic auxin is GA IBA NAA IAA32. A plant hormone related with inhibition of senescence is Ethylene ABA Gibberellin Bromic acid33. Guttation is the elimination of excess of water from plants through Wounds Lenticels Hydathodes Stomata34. Which one of the following would not be a limiting factor for photosynthesis? Oxygen Carbon dioxide Chlorophyll Light35. 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)36. 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 wind37. Stomata open during the day and close at night because Photosynthesis occurs during day time only 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 night38. Transpiration pull will be maximum under which of the following conditions? Open stomata, high humid atmosphere and dry soil Open stomata, high humid atmosphere and well irrigated soil Closed stomata, dry atmosphere and dry soil Open stomata, dry atmosphere and moist soil39. Plants lose water by guttation when Soil is dry and and the atmosphere is dry Soil is wet and and the atmosphere is humid Soil is wet and and the atmosphere is dry Rate of transpiration is high40. NADP is expanded as Nicotinamide adenosine dinucleous phosphate Nicotinamide adenosine dinucleotide phosphate Nicotinamide adenine dinucleotide phosphate Nicotinamide adenine dinucleous phosphate41. 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 water42. Osmosis involves diffusion of 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 solution Molecules or ions from the more concentrated solution to the less concentrated solution43. The phytohormone that prevents the germination of seeds is Gibberellin Auxin Abscisic acid Cytokinin44. Which one of these reaction occurs during photosynthesis? Carbon dioxide and water both are oxidized Carbon dioxide is reduced and water is oxidized Water is reduced and Carbon dioxide is oxidized Carbon dioxide and water both are reduced45. Cell division in plants is promoted by Cytokinin ABA Ethylene Gibberellin46 out of 45Please fill in the comment box below.
