Plant Physiology Welcome to your Plant Physiology 1. Which would do maximum harm to a tree? Loss of half of its flowers Loss of a little bark Loss of half of its branches Loss of all of its leaves2. Water will be absorbed by the root hairs when: None of the above Concentration of solutes in the cell sap is high Concentration of solutes in the soil is high The plant is rapidly respiring3. Osmosis involves diffusion of Suspended particles from lower to higher concentration Solvent particles from the less concentrated solution to the more concentrated solution Suspended particles from higher to lower concentration Molecules or ions from the more concentrated solution to the less concentrated solution4. 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 cells5. Plasma membrane controls Passage of water and solutes into the cell Passage of water only Movement of cell contents out of the cell Passage of water and solutes in and out of the cell6. If the rate of transpiration becomes more than the rate of photosynthesis, plants will Stop growing and gradually die of starvation Grow more vigorously because more energy will be available be killed instantly Continue to live, but will not be able to store food7. The production of starch and not glucose is often used as a measure of photosynthesis in leaves because Glucose formed in photosynthesis soon gets converted into starch Starch is an immediate of photosynthesis Starch is insoluble in water Sugar cannot be tested8. 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 Remove starch from the experimental leaf Ensure that starch is not translocated from the leaves9. Transpiration is very low during the storms due to None of the above Presence of moisture in the wind Low temperature during storms High velocity of wind10. Process of endosmosis stops When there is no light When the water concentration becomes equal When the solution becomes isotonic When the leaves fall11. Internodal elongation is associated with ABA Cytokinin Gibberellin Auxin12. Osmosis involves Active absorption of water through roots Cell to cell movement of water All the above Movement of water through cortical cells13. Plants lose water by guttation when Rate of transpiration is high 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 humid14. The hormone responsible for phototropism and geotropism is Starch Auxin Gibberellin Enzyme15. A plant hormone for inducing Morphogenesis in plant tissue culture is Gibberellin Abscisic acid Ethylene Cytokinin16. Cell division in plants is promoted by Gibberellin ABA Ethylene Cytokinin17. 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 soil18. Which one of the following would not be a limiting factor for photosynthesis? Oxygen Carbon dioxide Chlorophyll Light19. Guttation is the elimination of excess of water from plants through Stomata Hydathodes Lenticels Wounds20. The rate of photosynthesis is not affected by Carbon dioxide concentration Humidity Temperature Light intensity21. In the process of Osmosis in a cell: Both protoplasm and cell wall act as a membrane Only outermost layer of protoplast acts as a membrane The entire protoplast acts as a membrane Only cell wall acts as a membrane22. The phytohormone that helps in the germination of seeds is ABA Gibberellin Auxin Cytokinin23. Which one of the following pairs is not correctly matched? Gibberellic acid - Leaf fall Abscisic acid - Stomatal closure Cytokinin - Cell division IAA - Cell wall elongation24. The phytohormone that prevents the germination of seeds is Auxin Cytokinin Gibberellin Abscisic acid25. When cell is fully turgid, which of the following will be zero? Turgor pressure Suction pressure(SP) or Diffusion pressure Deficit (DPD) Wall pressure Osmotic pressure26. 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 cells27. The space between the cell wall and plasma membrane in a plasmolysed cell is filled with Water Hypertonic solution Hypotonic solution Isotonic solution28. The specific function of light energy in the process of photosynthesis is to Synthesize glucose Reduce carbondioxide Split water Activate chlorophyll29. NADP is expanded as Nicotinamide adenine dinucleous phosphate Nicotinamide adenosine dinucleotide phosphate Nicotinamide adenine dinucleotide phosphate Nicotinamide adenosine dinucleous phosphate30. Ethylene is used for Slowing down ripening of apples Hastening of ripening of fruits Both hastening of ripening of fruits and slowing down ripening of apples Retarding ripening of tomatoes31. One of the synthetic auxin is IAA NAA GA IBA32. Compensation point means the condition When the entire food manufactured in photosynthesis remains unutilised Where there is neither photosynthesis nor respiration When the pot is watered just to meet the full requirement of the plant When the rate of photosynthesis is equal to the rate of respiration33. Which one of these reaction occurs during photosynthesis? Water is reduced and Carbon dioxide is oxidized Carbon dioxide is reduced and water is oxidized Carbon dioxide and water both are reduced Carbon dioxide and water both are oxidized34. A plant hormone related with inhibition of senescence is Bromic acid Ethylene ABA Gibberellin35. Marine fish when thrown under tap water bursts because of Plasmolysis Endosmosis Exosmosis Diffusion36. Positive geotropism is exhibited by Root Shoot Leaves Stem37. In hot summer days, plant cooling is due to Transport of water in plant Loss of water from entire plant Loss of water vapour from leaves Loss of liquid water38. Which of the following regulate closure of stomata? Auxins Cytokinin Bromic acid ABA39. A cell that lacks chloroplast does not Utilize carbohydrates Evolve carbon dioxide Require water Liberate oxygen40. Which of the following is not an effect of ethylene? Helps to overcome apical dominance Hastens fruit ripening Breaks seed and bud dormancy Promotes senescence and abscission of plant organs41. Seeds when soaked in water imbibe in it because There are many vacuoles in the endosperm Seed coat contains lot of salts Osmotic pressure inside the seed is low The process of absorption works42. A phytohormone existing in gaseous state is Cytokinin Auxin Ethylene Abscisic acid43. To increase sugar production in sugarcanes, they are sprayed with IAA ABA Gibberellin Cytokinin44. When a plant wilts, the sequence of events is as follows: None of the above Exosmosis, deplasmolysis, plasmolysis, temporary and permanent wilting Exosmosis, plasmolysis, temporary and permanent wilting Exosmosis, plasmolysis, deplasmolysis, temporary wilting45. Chlorophyll is present In the grana of chloroplast In the stroma of chloroplast On the surface of chloroplast Dispersed throughout the chloroplast46 out of 45Please fill in the comment box below.
