Plant Physiology Welcome to your Plant Physiology 1. Seeds when soaked in water imbibe in it because Osmotic pressure inside the seed is low There are many vacuoles in the endosperm The process of absorption works Seed coat contains lot of salts2. 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 dry3. The hormone responsible for phototropism and geotropism is Auxin Starch Enzyme Gibberellin4. To increase sugar production in sugarcanes, they are sprayed with ABA Cytokinin IAA Gibberellin5. One of the synthetic auxin is IBA NAA GA IAA6. A cell that lacks chloroplast does not Liberate oxygen Require water Evolve carbon dioxide Utilize carbohydrates7. Which one of the following pairs is not correctly matched? Cytokinin - Cell division Gibberellic acid - Leaf fall IAA - Cell wall elongation Abscisic acid - Stomatal closure8. Process of endosmosis stops When there is no light When the water concentration becomes equal When the leaves fall When the solution becomes isotonic9. Ethylene is used for Retarding ripening of tomatoes Slowing down ripening of apples Both hastening of ripening of fruits and slowing down ripening of apples Hastening of ripening of fruits10. Osmosis involves All the above Movement of water through cortical cells Active absorption of water through roots Cell to cell movement of water11. Positive geotropism is exhibited by Shoot Leaves Root Stem12. The specific function of light energy in the process of photosynthesis is to Reduce carbondioxide Synthesize glucose Split water Activate chlorophyll13. Which of the following regulate closure of stomata? Auxins Cytokinin Bromic acid ABA14. When cell is fully turgid, which of the following will be zero? Suction pressure(SP) or Diffusion pressure Deficit (DPD) Turgor pressure Osmotic pressure Wall pressure15. 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 soil16. NADP is expanded as Nicotinamide adenosine dinucleotide phosphate Nicotinamide adenine dinucleotide phosphate Nicotinamide adenosine dinucleous phosphate Nicotinamide adenine dinucleous phosphate17. A phytohormone existing in gaseous state is Cytokinin Auxin Ethylene Abscisic acid18. The phytohormone that prevents the germination of seeds is Auxin Gibberellin Abscisic acid Cytokinin19. Which one of the following would not be a limiting factor for photosynthesis? Chlorophyll Carbon dioxide Oxygen Light20. Guttation is the elimination of excess of water from plants through Wounds Lenticels Stomata Hydathodes21. Plasma membrane controls Passage of water and solutes in and out of the cell Passage of water and solutes into the cell Passage of water only Movement of cell contents out of the cell22. Compensation point means the condition Where there is neither photosynthesis nor respiration When the rate of photosynthesis is equal to the rate of respiration When the entire food manufactured in photosynthesis remains unutilised When the pot is watered just to meet the full requirement of the plant23. 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 cells24. The phytohormone that helps in the germination of seeds is ABA Cytokinin Auxin Gibberellin25. In the process of Osmosis in a cell: Only cell wall acts as a membrane Only outermost layer of protoplast acts as a membrane The entire protoplast acts as a membrane Both protoplasm and cell wall act as a membrane26. 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 Stop growing and gradually die of starvation be killed instantly Grow more vigorously because more energy will be available27. Osmosis involves diffusion of Suspended particles from higher to lower 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 solution Suspended particles from lower to higher concentration28. 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 bark29. A plant hormone for inducing Morphogenesis in plant tissue culture is Cytokinin Ethylene Gibberellin Abscisic acid30. When a plant wilts, the sequence of events is as follows: None of the above Exosmosis, plasmolysis, temporary and permanent wilting Exosmosis, plasmolysis, deplasmolysis, temporary wilting Exosmosis, deplasmolysis, plasmolysis, temporary and permanent wilting31. Marine fish when thrown under tap water bursts because of Endosmosis Diffusion Plasmolysis Exosmosis32. The production of starch and not glucose is often used as a measure of photosynthesis in leaves because Starch is an immediate of photosynthesis Starch is insoluble in water Sugar cannot be tested Glucose formed in photosynthesis soon gets converted into starch33. Stomata open during the day and close at night because 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 night Photosynthesis occurs during day time only34. The space between the cell wall and plasma membrane in a plasmolysed cell is filled with Isotonic solution Water Hypertonic solution Hypotonic solution35. Cell division in plants is promoted by Cytokinin Ethylene ABA Gibberellin36. Transpiration is very low during the storms due to High velocity of wind None of the above Presence of moisture in the wind Low temperature during storms37. The rate of photosynthesis is not affected by Humidity Temperature Light intensity Carbon dioxide concentration38. Water will be absorbed by the root hairs when: None of the above The plant is rapidly respiring Concentration of solutes in the cell sap is high Concentration of solutes in the soil is high39. Internodal elongation is associated with ABA Auxin Cytokinin Gibberellin40. 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 chlorophyll from the leaf of the plant Remove starch from the plant41. Chlorophyll is present In the stroma of chloroplast In the grana of chloroplast On the surface of chloroplast Dispersed throughout the chloroplast42. In hot summer days, plant cooling is due to Loss of water from entire plant Loss of liquid water Loss of water vapour from leaves Transport of water in plant43. Which of the following is not an effect of ethylene? Helps to overcome apical dominance Promotes senescence and abscission of plant organs Hastens fruit ripening Breaks seed and bud dormancy44. A plant hormone related with inhibition of senescence is Gibberellin ABA Ethylene Bromic acid45. Which one of these reaction occurs during photosynthesis? Carbon dioxide and water both are reduced Carbon dioxide is reduced and water is oxidized Carbon dioxide and water both are oxidized Water is reduced and Carbon dioxide is oxidized46 out of 45Please fill in the comment box below.
