Plant Physiology Welcome to your Plant Physiology 1. The space between the cell wall and plasma membrane in a plasmolysed cell is filled with Water Isotonic solution Hypertonic solution Hypotonic solution2. Water will be absorbed by the root hairs when: Concentration of solutes in the soil is high The plant is rapidly respiring None of the above Concentration of solutes in the cell sap is high3. To increase sugar production in sugarcanes, they are sprayed with Cytokinin ABA Gibberellin IAA4. Which would do maximum harm to a tree? Loss of all of its leaves Loss of half of its flowers Loss of a little bark Loss of half of its branches5. The hormone responsible for phototropism and geotropism is Gibberellin Enzyme Auxin Starch6. Which one of these reaction occurs during photosynthesis? Carbon dioxide is reduced and water is oxidized Carbon dioxide and water both are oxidized Carbon dioxide and water both are reduced Water is reduced and Carbon dioxide is oxidized7. Cell division in plants is promoted by Gibberellin ABA Cytokinin Ethylene8. The rate of photosynthesis is not affected by Carbon dioxide concentration Light intensity Humidity Temperature9. 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 leaves10. Marine fish when thrown under tap water bursts because of Plasmolysis Diffusion Exosmosis Endosmosis11. Which one of the following would not be a limiting factor for photosynthesis? Oxygen Chlorophyll Carbon dioxide Light12. Compensation point means the condition When the pot is watered just to meet the full requirement of the plant When the entire food manufactured in photosynthesis remains unutilised When the rate of photosynthesis is equal to the rate of respiration Where there is neither photosynthesis nor respiration13. Plasma membrane controls Passage of water and solutes into the cell Passage of water and solutes in and out of the cell Passage of water only Movement of cell contents out of the cell14. Which of the following is not an effect of ethylene? Helps to overcome apical dominance Breaks seed and bud dormancy Hastens fruit ripening Promotes senescence and abscission of plant organs15. NADP is expanded as Nicotinamide adenine dinucleotide phosphate Nicotinamide adenine dinucleous phosphate Nicotinamide adenosine dinucleotide phosphate Nicotinamide adenosine dinucleous phosphate16. The specific function of light energy in the process of photosynthesis is to Activate chlorophyll Split water Reduce carbondioxide Synthesize glucose17. Positive geotropism is exhibited by Shoot Root Leaves Stem18. 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 Grow more vigorously because more energy will be available be killed instantly19. A plant hormone for inducing Morphogenesis in plant tissue culture is Ethylene Gibberellin Abscisic acid Cytokinin20. A cell that lacks chloroplast does not Require water Evolve carbon dioxide Utilize carbohydrates Liberate oxygen21. Seeds when soaked in water imbibe in it because The process of absorption works Osmotic pressure inside the seed is low There are many vacuoles in the endosperm Seed coat contains lot of salts22. Chlorophyll is present Dispersed throughout the chloroplast On the surface of chloroplast In the stroma of chloroplast In the grana of chloroplast23. Osmosis involves Cell to cell movement of water All the above Active absorption of water through roots Movement of water through cortical cells24. Internodal elongation is associated with ABA Gibberellin Auxin Cytokinin25. In the mechanism of opening and closing of stomata, the important factor is The starch content of the cells The turgid and flaccid state of the guard cells The protein content of the cells The presence of Chloroplast in the guard cells26. When a plant wilts, the sequence of events is as follows: Exosmosis, deplasmolysis, plasmolysis, temporary and permanent wilting Exosmosis, plasmolysis, temporary and permanent wilting Exosmosis, plasmolysis, deplasmolysis, temporary wilting None of the above27. 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. 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 Closed stomata, dry atmosphere and dry soil Open stomata, high humid atmosphere and dry soil29. The production of starch and not glucose is often used as a measure of photosynthesis in leaves because Starch is insoluble in water Sugar cannot be tested Starch is an immediate of photosynthesis Glucose formed in photosynthesis soon gets converted into starch30. The phytohormone that prevents the germination of seeds is Abscisic acid Cytokinin Auxin Gibberellin31. 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 pressure32. 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 Loss of starch in day time raises OP of subsidiary cells Photosynthesis occurs during day time only33. In hot summer days, plant cooling is due to Loss of water vapour from leaves Loss of water from entire plant Transport of water in plant Loss of liquid water34. Which of the following regulate closure of stomata? ABA Auxins Bromic acid Cytokinin35. Transpiration is very low during the storms due to None of the above High velocity of wind Low temperature during storms Presence of moisture in the wind36. Plants lose water by guttation when 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 dry Rate of transpiration is high37. The phytohormone that helps in the germination of seeds is Auxin ABA Gibberellin Cytokinin38. A phytohormone existing in gaseous state is Cytokinin Abscisic acid Auxin Ethylene39. Process of endosmosis stops When the leaves fall When the water concentration becomes equal When there is no light When the solution becomes isotonic40. One of the synthetic auxin is IBA IAA GA NAA41. Which one of the following pairs is not correctly matched? Gibberellic acid - Leaf fall IAA - Cell wall elongation Abscisic acid - Stomatal closure Cytokinin - Cell division42. Guttation is the elimination of excess of water from plants through Lenticels Stomata Hydathodes Wounds43. In the process of Osmosis in a cell: Only outermost layer of protoplast acts as a membrane Both protoplasm and cell wall act as a membrane The entire protoplast acts as a membrane Only cell wall acts as a membrane44. 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 apples45. A plant hormone related with inhibition of senescence is Gibberellin Ethylene Bromic acid ABA46 out of 45Please fill in the comment box below.
