Plant Physiology Welcome to your Plant Physiology 1. NADP is expanded as Nicotinamide adenine dinucleotide phosphate Nicotinamide adenosine dinucleous phosphate Nicotinamide adenine dinucleous phosphate Nicotinamide adenosine dinucleotide phosphate2. Water will be absorbed by the root hairs when: Concentration of solutes in the cell sap is high The plant is rapidly respiring None of the above Concentration of solutes in the soil is high3. Which of the following regulate closure of stomata? Bromic acid Cytokinin ABA Auxins4. 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 Grow more vigorously because more energy will be available be killed instantly Stop growing and gradually die of starvation5. To increase sugar production in sugarcanes, they are sprayed with Gibberellin ABA Cytokinin IAA6. Plants lose water by guttation when Soil is dry and and the atmosphere is dry Soil is wet and and the atmosphere is dry Rate of transpiration is high Soil is wet and and the atmosphere is humid7. 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. Marine fish when thrown under tap water bursts because of Endosmosis Exosmosis Plasmolysis Diffusion9. When a plant wilts, the sequence of events is as follows: Exosmosis, plasmolysis, deplasmolysis, temporary wilting Exosmosis, plasmolysis, temporary and permanent wilting None of the above Exosmosis, deplasmolysis, plasmolysis, temporary and permanent wilting10. 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 Open stomata, high humid atmosphere and well irrigated soil Closed stomata, dry atmosphere and dry soil11. Cell division in plants is promoted by Ethylene Cytokinin Gibberellin ABA12. A plant hormone for inducing Morphogenesis in plant tissue culture is Cytokinin Ethylene Gibberellin Abscisic acid13. Seeds when soaked in water imbibe in it because There are many vacuoles in the endosperm Osmotic pressure inside the seed is low Seed coat contains lot of salts The process of absorption works14. Plasma membrane controls 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 cell Passage of water only15. Internodal elongation is associated with Gibberellin Auxin ABA Cytokinin16. Stomata open during the day and close at night because Loss of starch in day time raises OP of subsidiary cells Photosynthesis occurs during day time only Enzymes convert starch into sugar at elevated pH in night Loss of sugar increases osmotic concentration of the cell sap17. The phytohormone that prevents the germination of seeds is Cytokinin Auxin Gibberellin Abscisic acid18. Which one of these reaction occurs during photosynthesis? Carbon dioxide and water both are oxidized Water is reduced and Carbon dioxide is oxidized Carbon dioxide is reduced and water is oxidized Carbon dioxide and water both are reduced19. Which one of the following pairs is not correctly matched? Abscisic acid - Stomatal closure IAA - Cell wall elongation Gibberellic acid - Leaf fall Cytokinin - Cell division20. Transpiration is very low during the storms due to None of the above Low temperature during storms High velocity of wind Presence of moisture in the wind21. Compensation point means the condition 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 respiration When the pot is watered just to meet the full requirement of the plant22. The phytohormone that helps in the germination of seeds is Cytokinin Auxin Gibberellin ABA23. In the mechanism of opening and closing of stomata, the important factor is The turgid and flaccid state of the guard cells The starch content of the cells The protein content of the cells The presence of Chloroplast in the guard cells24. In the process of Osmosis in a cell: The entire protoplast acts as a membrane Only cell wall acts as a membrane Both protoplasm and cell wall act as a membrane Only outermost layer of protoplast acts as a membrane25. Process of endosmosis stops When the leaves fall When the solution becomes isotonic When there is no light When the water concentration becomes equal26. In hot summer days, plant cooling is due to Loss of water vapour from leaves Loss of water from entire plant Loss of liquid water Transport of water in plant27. One of the synthetic auxin is NAA IAA IBA GA28. A phytohormone existing in gaseous state is Abscisic acid Cytokinin Auxin Ethylene29. The specific function of light energy in the process of photosynthesis is to Split water Activate chlorophyll Reduce carbondioxide Synthesize glucose30. Ethylene is used for Both hastening of ripening of fruits and slowing down ripening of apples Slowing down ripening of apples Retarding ripening of tomatoes Hastening of ripening of fruits31. Chlorophyll is present In the stroma of chloroplast Dispersed throughout the chloroplast In the grana of chloroplast On the surface of chloroplast32. 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 Remove starch from the plant Ensure that starch is not translocated from the leaves Remove chlorophyll from the leaf of the plant33. Positive geotropism is exhibited by Root Leaves Shoot Stem34. 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 bark35. The space between the cell wall and plasma membrane in a plasmolysed cell is filled with Hypotonic solution Water Isotonic solution Hypertonic solution36. Which one of the following would not be a limiting factor for photosynthesis? Chlorophyll Carbon dioxide Light Oxygen37. 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 ripening38. Osmosis involves diffusion of 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 solution Suspended particles from higher to lower concentration39. The rate of photosynthesis is not affected by Carbon dioxide concentration Temperature Humidity Light intensity40. When cell is fully turgid, which of the following will be zero? Wall pressure Osmotic pressure Suction pressure(SP) or Diffusion pressure Deficit (DPD) Turgor pressure41. The hormone responsible for phototropism and geotropism is Enzyme Gibberellin Auxin Starch42. Osmosis involves All the above Cell to cell movement of water Movement of water through cortical cells Active absorption of water through roots43. A cell that lacks chloroplast does not Utilize carbohydrates Require water Evolve carbon dioxide Liberate oxygen44. Guttation is the elimination of excess of water from plants through Wounds Lenticels Hydathodes Stomata45. A plant hormone related with inhibition of senescence is ABA Bromic acid Ethylene Gibberellin46 out of 45Please fill in the comment box below.
