Plant Physiology Welcome to your Plant Physiology 1. 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 endosperm2. 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 night3. NADP is expanded as Nicotinamide adenine dinucleous phosphate Nicotinamide adenine dinucleotide phosphate Nicotinamide adenosine dinucleous phosphate Nicotinamide adenosine dinucleotide phosphate4. 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 Only cell wall acts as a membrane The entire protoplast acts as a membrane5. Ethylene is used for Slowing down ripening of apples Both hastening of ripening of fruits and slowing down ripening of apples Hastening of ripening of fruits Retarding ripening of tomatoes6. A plant hormone related with inhibition of senescence is Gibberellin Bromic acid Ethylene ABA7. 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 presence of Chloroplast in the guard cells The starch content of the cells8. Which one of the following would not be a limiting factor for photosynthesis? Light Oxygen Chlorophyll Carbon dioxide9. Plants lose water by guttation when Rate of transpiration is high Soil is dry and and the atmosphere is dry Soil is wet and and the atmosphere is dry Soil is wet and and the atmosphere is humid10. 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 reduced Carbon dioxide and water both are oxidized11. When cell is fully turgid, which of the following will be zero? Suction pressure(SP) or Diffusion pressure Deficit (DPD) Osmotic pressure Turgor pressure Wall pressure12. The hormone responsible for phototropism and geotropism is Enzyme Starch Gibberellin Auxin13. Guttation is the elimination of excess of water from plants through Stomata Lenticels Hydathodes Wounds14. The rate of photosynthesis is not affected by Temperature Light intensity Humidity Carbon dioxide concentration15. A phytohormone existing in gaseous state is Cytokinin Auxin Ethylene Abscisic acid16. The space between the cell wall and plasma membrane in a plasmolysed cell is filled with Hypertonic solution Water Isotonic solution Hypotonic solution17. A plant hormone for inducing Morphogenesis in plant tissue culture is Ethylene Gibberellin Abscisic acid Cytokinin18. Positive geotropism is exhibited by Root Stem Shoot Leaves19. Process of endosmosis stops When the solution becomes isotonic When there is no light When the water concentration becomes equal When the leaves fall20. The production of starch and not glucose is often used as a measure of photosynthesis in leaves because Sugar cannot be tested Glucose formed in photosynthesis soon gets converted into starch Starch is an immediate of photosynthesis Starch is insoluble in water21. Which of the following is not an effect of ethylene? Breaks seed and bud dormancy Helps to overcome apical dominance Hastens fruit ripening Promotes senescence and abscission of plant organs22. A plant is kept in a dark cupbord for about 48 hours before conducting any experiment on photosynthesis to Remove starch from the experimental leaf Ensure that starch is not translocated from the leaves Remove starch from the plant Remove chlorophyll from the leaf of the plant23. Which would do maximum harm to a tree? Loss of half of its flowers Loss of half of its branches Loss of a little bark Loss of all of its leaves24. The specific function of light energy in the process of photosynthesis is to Reduce carbondioxide Activate chlorophyll Synthesize glucose Split water25. Plasma membrane controls Passage of water only Passage of water and solutes into the cell Passage of water and solutes in and out of the cell Movement of cell contents out of the cell26. To increase sugar production in sugarcanes, they are sprayed with Cytokinin IAA Gibberellin ABA27. Osmosis involves diffusion of Molecules or ions from the more concentrated solution to the less concentrated solution Suspended particles from higher to lower concentration Solvent particles from the less concentrated solution to the more concentrated solution Suspended particles from lower to higher concentration28. Marine fish when thrown under tap water bursts because of Endosmosis Diffusion Exosmosis Plasmolysis29. Compensation point means the condition 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 unutilised When the rate of photosynthesis is equal to the rate of respiration30. The phytohormone that helps in the germination of seeds is Cytokinin Auxin Gibberellin ABA31. A cell that lacks chloroplast does not Liberate oxygen Utilize carbohydrates Evolve carbon dioxide Require water32. If the rate of transpiration becomes more than the rate of photosynthesis, plants will Grow more vigorously because more energy will be available Stop growing and gradually die of starvation be killed instantly Continue to live, but will not be able to store food33. The phytohormone that prevents the germination of seeds is Cytokinin Abscisic acid Auxin Gibberellin34. Chlorophyll is present In the stroma of chloroplast Dispersed throughout the chloroplast In the grana of chloroplast On the surface of chloroplast35. Cell division in plants is promoted by Gibberellin ABA Ethylene Cytokinin36. Transpiration is very low during the storms due to High velocity of wind Low temperature during storms None of the above Presence of moisture in the wind37. 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 leaves38. Which one of the following pairs is not correctly matched? Cytokinin - Cell division Abscisic acid - Stomatal closure Gibberellic acid - Leaf fall IAA - Cell wall elongation39. One of the synthetic auxin is IBA IAA NAA GA40. Water will be absorbed by the root hairs when: None of the above Concentration of solutes in the cell sap is high The plant is rapidly respiring Concentration of solutes in the soil is high41. Transpiration pull will be maximum under which of the following conditions? Open stomata, high humid atmosphere and well irrigated soil Open stomata, dry atmosphere and moist soil Open stomata, high humid atmosphere and dry soil Closed stomata, dry atmosphere and dry soil42. Internodal elongation is associated with Cytokinin ABA Gibberellin Auxin43. Which of the following regulate closure of stomata? ABA Bromic acid Auxins Cytokinin44. Osmosis involves Cell to cell movement of water Movement of water through cortical cells Active absorption of water through roots All the above45. When a plant wilts, the sequence of events is as follows: Exosmosis, plasmolysis, temporary and permanent wilting None of the above Exosmosis, plasmolysis, deplasmolysis, temporary wilting Exosmosis, deplasmolysis, plasmolysis, temporary and permanent wilting46 out of 45Please fill in the comment box below.
