Plant Physiology Welcome to your Plant Physiology 1. Ethylene is used for Hastening of ripening of fruits Retarding ripening of tomatoes Both hastening of ripening of fruits and slowing down ripening of apples Slowing down ripening of apples2. Which of the following is not an effect of ethylene? Breaks seed and bud dormancy Hastens fruit ripening Promotes senescence and abscission of plant organs Helps to overcome apical dominance3. In the mechanism of opening and closing of stomata, the important factor is The turgid and flaccid state of the guard cells The protein content of the cells The starch content of the cells The presence of Chloroplast in the guard cells4. Compensation point means the condition When the rate of photosynthesis is equal to the rate of respiration 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 plant5. Positive geotropism is exhibited by Leaves Shoot Root Stem6. NADP is expanded as Nicotinamide adenine dinucleous phosphate Nicotinamide adenine dinucleotide phosphate Nicotinamide adenosine dinucleous phosphate Nicotinamide adenosine dinucleotide phosphate7. Which one of the following pairs is not correctly matched? Abscisic acid - Stomatal closure IAA - Cell wall elongation Cytokinin - Cell division Gibberellic acid - Leaf fall8. 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 wilting9. Osmosis involves Active absorption of water through roots Movement of water through cortical cells Cell to cell movement of water All the above10. 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 cell11. A plant hormone for inducing Morphogenesis in plant tissue culture is Gibberellin Abscisic acid Cytokinin Ethylene12. One of the synthetic auxin is GA NAA IAA IBA13. In hot summer days, plant cooling is due to Transport of water in plant Loss of water vapour from leaves Loss of liquid water Loss of water from entire plant14. Marine fish when thrown under tap water bursts because of Diffusion Endosmosis Plasmolysis Exosmosis15. A cell that lacks chloroplast does not Utilize carbohydrates Liberate oxygen Require water Evolve carbon dioxide16. Stomata open during the day and close at night because Loss of sugar increases osmotic concentration of the cell sap Enzymes convert starch into sugar at elevated pH in night Photosynthesis occurs during day time only Loss of starch in day time raises OP of subsidiary cells17. The hormone responsible for phototropism and geotropism is Auxin Gibberellin Enzyme Starch18. Which one of the following would not be a limiting factor for photosynthesis? Carbon dioxide Chlorophyll Light Oxygen19. Guttation is the elimination of excess of water from plants through Hydathodes Wounds Lenticels Stomata20. The rate of photosynthesis is not affected by Humidity Temperature Light intensity Carbon dioxide concentration21. Seeds when soaked in water imbibe in it because Osmotic pressure inside the seed is low Seed coat contains lot of salts There are many vacuoles in the endosperm The process of absorption works22. Which one of these reaction occurs during photosynthesis? Carbon dioxide is reduced and water is oxidized Water is reduced and Carbon dioxide is oxidized Carbon dioxide and water both are oxidized Carbon dioxide and water both are reduced23. 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 Continue to live, but will not be able to store food be killed instantly24. A phytohormone existing in gaseous state is Auxin Abscisic acid Cytokinin Ethylene25. Chlorophyll is present In the stroma of chloroplast Dispersed throughout the chloroplast On the surface of chloroplast In the grana of chloroplast26. The phytohormone that helps in the germination of seeds is Auxin Gibberellin Cytokinin ABA27. 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 Open stomata, dry atmosphere and moist soil Closed stomata, dry atmosphere and dry soil28. The specific function of light energy in the process of photosynthesis is to Reduce carbondioxide Synthesize glucose Split water Activate chlorophyll29. The space between the cell wall and plasma membrane in a plasmolysed cell is filled with Hypertonic solution Water Hypotonic solution Isotonic solution30. 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 dry31. A plant hormone related with inhibition of senescence is Bromic acid Gibberellin Ethylene ABA32. 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 Sugar cannot be tested Starch is insoluble in water Starch is an immediate of photosynthesis33. In the process of Osmosis in a cell: The entire protoplast acts as a membrane Only outermost layer of protoplast acts as a membrane Both protoplasm and cell wall act as a membrane Only cell wall acts as a membrane34. Process of endosmosis stops When the leaves fall When there is no light When the water concentration becomes equal When the solution becomes isotonic35. Which of the following regulate closure of stomata? Auxins Bromic acid ABA Cytokinin36. Cell division in plants is promoted by ABA Ethylene Gibberellin Cytokinin37. Osmosis involves diffusion of Suspended particles from lower to higher concentration Molecules or ions from the more concentrated solution to the less concentrated solution Solvent particles from the less concentrated solution to the more concentrated solution Suspended particles from higher to lower concentration38. A plant is kept in a dark cupbord for about 48 hours before conducting any experiment on photosynthesis to Remove starch from the plant Remove starch from the experimental leaf Remove chlorophyll from the leaf of the plant Ensure that starch is not translocated from the leaves39. When cell is fully turgid, which of the following will be zero? Osmotic pressure Suction pressure(SP) or Diffusion pressure Deficit (DPD) Wall pressure Turgor pressure40. Transpiration is very low during the storms due to High velocity of wind None of the above Low temperature during storms Presence of moisture in the wind41. Which would do maximum harm to a tree? Loss of half of its branches Loss of all of its leaves Loss of half of its flowers Loss of a little bark42. Internodal elongation is associated with Auxin Cytokinin ABA Gibberellin43. Water will be absorbed by the root hairs when: Concentration of solutes in the cell sap is high None of the above Concentration of solutes in the soil is high The plant is rapidly respiring44. The phytohormone that prevents the germination of seeds is Auxin Gibberellin Abscisic acid Cytokinin45. To increase sugar production in sugarcanes, they are sprayed with Cytokinin ABA Gibberellin IAA46 out of 45Please fill in the comment box below.
