Plant Physiology Welcome to your Plant Physiology 1. The specific function of light energy in the process of photosynthesis is to Activate chlorophyll Synthesize glucose Reduce carbondioxide Split water2. Which of the following regulate closure of stomata? Auxins Cytokinin Bromic acid ABA3. One of the synthetic auxin is IAA NAA GA IBA4. Cell division in plants is promoted by Cytokinin Gibberellin ABA Ethylene5. Which one of the following pairs is not correctly matched? Gibberellic acid - Leaf fall Cytokinin - Cell division Abscisic acid - Stomatal closure IAA - Cell wall elongation6. Internodal elongation is associated with ABA Auxin Cytokinin Gibberellin7. Transpiration pull will be maximum under which of the following conditions? Closed stomata, dry atmosphere and dry soil Open stomata, dry atmosphere and moist soil Open stomata, high humid atmosphere and dry soil Open stomata, high humid atmosphere and well irrigated soil8. Which of the following is not an effect of ethylene? Helps to overcome apical dominance Breaks seed and bud dormancy Promotes senescence and abscission of plant organs Hastens fruit ripening9. NADP is expanded as Nicotinamide adenine dinucleotide phosphate Nicotinamide adenosine dinucleotide phosphate Nicotinamide adenosine dinucleous phosphate Nicotinamide adenine dinucleous phosphate10. Which one of these reaction occurs during photosynthesis? Water is reduced and Carbon dioxide is oxidized Carbon dioxide and water both are reduced Carbon dioxide is reduced and water is oxidized Carbon dioxide and water both are oxidized11. The phytohormone that prevents the germination of seeds is Auxin Abscisic acid Cytokinin Gibberellin12. A plant hormone related with inhibition of senescence is Bromic acid Gibberellin Ethylene ABA13. Transpiration is very low during the storms due to Low temperature during storms High velocity of wind None of the above Presence of moisture in the wind14. When a plant wilts, the sequence of events is as follows: Exosmosis, deplasmolysis, plasmolysis, temporary and permanent wilting Exosmosis, plasmolysis, deplasmolysis, temporary wilting Exosmosis, plasmolysis, temporary and permanent wilting None of the above15. Which one of the following would not be a limiting factor for photosynthesis? Oxygen Carbon dioxide Chlorophyll Light16. The phytohormone that helps in the germination of seeds is Cytokinin Auxin ABA Gibberellin17. Seeds when soaked in water imbibe in it because There are many vacuoles in the endosperm Seed coat contains lot of salts The process of absorption works Osmotic pressure inside the seed is low18. Osmosis involves diffusion of 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 lower to higher concentration Suspended particles from higher to lower concentration19. Plasma membrane controls Passage of water only Passage of water and solutes in and out of the cell Movement of cell contents out of the cell Passage of water and solutes into the cell20. A cell that lacks chloroplast does not Require water Evolve carbon dioxide Liberate oxygen Utilize carbohydrates21. To increase sugar production in sugarcanes, they are sprayed with Gibberellin ABA IAA Cytokinin22. 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 Remove chlorophyll from the leaf of the plant Ensure that starch is not translocated from the leaves23. 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 starch24. Process of endosmosis stops When the water concentration becomes equal When the leaves fall When there is no light When the solution becomes isotonic25. Positive geotropism is exhibited by Stem Shoot Leaves Root26. The rate of photosynthesis is not affected by Temperature Carbon dioxide concentration Humidity Light intensity27. Compensation point means the condition 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 plant Where there is neither photosynthesis nor respiration28. Marine fish when thrown under tap water bursts because of Plasmolysis Endosmosis Diffusion Exosmosis29. A phytohormone existing in gaseous state is Auxin Abscisic acid Cytokinin Ethylene30. The space between the cell wall and plasma membrane in a plasmolysed cell is filled with Hypertonic solution Water Isotonic solution Hypotonic solution31. Osmosis involves Cell to cell movement of water All the above Movement of water through cortical cells Active absorption of water through roots32. In the process of Osmosis in a cell: Both protoplasm and cell wall act as a membrane Only cell wall acts as a membrane The entire protoplast acts as a membrane Only outermost layer of protoplast acts as a membrane33. In the mechanism of opening and closing of stomata, the important factor is The presence of Chloroplast in the guard cells The protein content of the cells The starch content of the cells The turgid and flaccid state of the guard cells34. 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 food35. A plant hormone for inducing Morphogenesis in plant tissue culture is Gibberellin Ethylene Cytokinin Abscisic acid36. 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 night37. In hot summer days, plant cooling is due to Loss of liquid water Loss of water vapour from leaves Loss of water from entire plant Transport of water in plant38. Water will be absorbed by the root hairs when: None of the above Concentration of solutes in the soil is high The plant is rapidly respiring Concentration of solutes in the cell sap is high39. Which would do maximum harm to a tree? Loss of a little bark Loss of half of its flowers Loss of all of its leaves Loss of half of its branches40. Plants lose water by guttation when Soil is wet and and the atmosphere is dry Soil is dry and and the atmosphere is dry Rate of transpiration is high Soil is wet and and the atmosphere is humid41. The hormone responsible for phototropism and geotropism is Auxin Enzyme Gibberellin Starch42. Guttation is the elimination of excess of water from plants through Stomata Hydathodes Lenticels Wounds43. When cell is fully turgid, which of the following will be zero? Turgor pressure Osmotic pressure Wall pressure Suction pressure(SP) or Diffusion pressure Deficit (DPD)44. Chlorophyll is present In the stroma of chloroplast In the grana of chloroplast Dispersed throughout the chloroplast On the surface of chloroplast45. Ethylene is used for Hastening of ripening of fruits Retarding ripening of tomatoes Slowing down ripening of apples Both hastening of ripening of fruits and slowing down ripening of apples46 out of 45Please fill in the comment box below.
