Page 1 : (c) Those plants which require exposure to light, period at critical or more than critical period for its, flowering response are called long day plants., more than critical period of light because it is a SDP., organic substances which are synthesized in low, 9. How leaf fall and fruit drop in plants can be prevented?, What are plant growth hormones? How do they differ, > Plant growth hormones are naturally occurring, physiological action and even in molecular structure., quantities in one part of the plant body and, 327, 2. Match column I with column II and select the correet, answer., LA) Nicotiana tabacum fails to flower, exposed to, Column I, Column I, А Terрenes, 6, furfuryl amino purine, 1 Kinetin, 8., from growth regulators?, 2 Gibberellin, C, Indole acetic acid, 3 Cytokinin, D Isopentenyl adenine, 4 Auxin, Answer codes:, (a) A 2, B 1, C = 4, D 3, (b) A = 1, B 2, C= 3, D= 4, (c) A 1, B = 2, C=4, D= 3, (d) A= 4, B = 3, C= 1, D 2, 3. Match column I with column II and select the correct, ransferred to some other parts where they are active., Plant growth regulators are synthetic chemical, substances which resemble the hormones in, Support your answer with reasons., Fall of mature leaves and ripe fruits from the stem, and branches of a plant is called abscission. It occurs, due to the formation of abscission layer due to more, ABA and lesser auxin contents at the base of, shedding parts. Abscission of leaves and fruits can be, prevented with the exogenous supply of auxins., 10. Explain how is it possible that a short day plant and a, long day plant growing in the same location could flower, on the same day of the year?, > If a short day plant is artificially supplied with long, and uninterrupted dark period, it can flower even, under long day conditions. Similarly, a long day plant, can flower under short photoperiods if artificially, given long photoperiods. Thus, it is possible that, short and long day plants growing in the same, locality are made to flower on the same day of the, year under artificial photoperiods., answer,, Column 1, Column II, A Ripening hormone, 1 Gibberellins, B Dormin, 2 Auxin, C Apical dominance, D Bolting, 3 Abscisic acid, 4 Ethylene, Answer codes :, (a) A = 2, B = 1, C = 3, D = 4, (b) A = 3, B = 2, C = 1, D= 4, (c) A = 2, B = 3, C=4, D 1, (d) A = 4, B= 3, C=2, D 1, 4. Match column I with column II and select the correct, answer., Column I, Column II, A Auxin, 1 Delay of senescence, B Gibberellin, 2 Herbicides, 3 Internodal elongation, C Ehylene, D Cytokinin, 4 Promotes senescence, MATCH THE COLUMN TYPE QUESTIONS, Answer codes :, (a) A= 2, B = 1, C= 3, D= 4, (b) A = 2, B = 3, C=4, D= 1, (c) A = 3, B = 2, C=4, D 1, (d) A = 3, B= 2, C = 1, D= 4, 5. Match column I with column II and select the correct, 1. Match column I with column II and select the correct, answer., Column I, Column II, A Photoperiodism, 1 Went, B Auxins, 2 Letham, C Gibberellins, 3 Garner and Allard, answer., Column II, D Zeatin, 4 Kurosawa, Column I, 1 Butler & Co-workers, A Florigen, Answer codes :, 2 Chailakhyan, B Vernalin, (a) A= 1, B= 4, C= 3, D = 2, (b) A=3, B= 1, C= 4, D= 2, (e) A= 2, B = 3, C = 1, D= 4, (d) A= 3, B = 2, C = 4, D= 1, 3 Melchers, C Phytochrome, 4 Boysen-Jensen, D Auxin

Page 2 : Reason (R) : During fruit ripening relatively la, 4. Assertion (A): Senescence is delayed by the applia, produced during low temperature treatment., 10. Hormone florigen is involved in vernalization and th, 9. Ifa long day plant is exposed to continuous darknew, GRB New Era Biology: Class-Xl (he, 328, provided sucrose, it produces flowers, Answer codes:, (a) A 1, B-2, C- 3, D 4, (b) A 2, B 1, C-4, D 3, (c) A 2, B-3, C-1, D 4, (d) A 3, B 2, C 1, D 4, ANSWERS, ANSWERS, 2. T, 7. F, 3. F, 1. T, 6. T, 4. F, 5.1, 9. F, 14. F, 8. T, 3. (d), 4. (b), 5. (c), 1. (b), 2. (a), ASSERTION AND REASON, TYPE QUESTIONS, MISCELLANEOUS QUESTIONS, In each of the following questions, two stateme, given, one is Assertion (A) while the other is, (R). Examine the statements carefully and mart, correct answer according to the instructions, OFill in the blanks, 1. Leaf fall occurs when the content of auxin, 2. Elongation of shoot just before flowering is called-, 3. Apical dominance is due to -., 4. Cell divisions in vascular cambium are promoted by, below., (a) Both (A) and (R) are true and (R) is co, explanation of (A), (b) Both (A) and (R) are true but (R) is not com, explanation of (A), (c) (A) is true and (R) is false, (d) Both (A) and (R) are false, 1. Assertion (A) : A farmer does not prefer to grow tobu, plant under short day conditions., Reason (R): Tobacco is a long day plant., 2. Assertion (A): The endogenous level of plant hem, is estimated by bioassay method., Reason (R) : The concentration of hormones in plas, so low that it is not possible to chemically measut, level., 5., is a stress hormone., 6. Chemically, phytochrome is a, 7. Dormancy induction is due to, 8. Genetically dwarf plants get elongated ., 9. Cytokinins are derivatives of ., 10. a-amylase activity in germinating barley seeds is due to, the activity of-, ANSWERS, 1. Decreases, 2. Bolting, 3. Auxins, 4. Auxins, 5. ABA, 6., Proteinaceous pigment, 7. ABA, 8. GAS, 9. Purines, 10., GAS., 3. Assertion (A) : Ethylene triggers ripening, fruits., O True or False statements, State whether the following statements are True (T) or, False (F)., 1. Auxins like IAA, NAA and 2, 4-D can induce partheno-, quantities of ethylene are formed and released, surrounding air., сагру., 2. In roots, auxin transport is polar and acropetal., 3. For substituting cold treatment, the GAS are applied, endogenously., 4. Conditions of mechanical stress and wounding decrease, the production of ethylene., 5. All seed plants are known to produce ethylene., 6. No flowering occurs if the plant is exposed to green light., 7. Seed germination is inhibited by red wavelength (660, nm) and promoted by far red (730 nm)., 8. The Pr form changes to Pfr in light., of cytokinins in plants., chlorophyll., with leaves far apart., gibberellins during its growing period., ANSWERS, 4. (a), 1, (d), 2. (c), 3. (b)

Page 3 : bending towards light ceases because it hampers :, Leaf fall occurs when the content of:, d) rooting in stem cutting, MULTIPLE CHOICE QUESTIONS, If the tip of seedling is cut off, its growth as well as, The growth of cells that causes stems to bend towards the, Source of light is due to unequal distribution of:, Pruning of hedge is advised to make it dense. The, Which of the following physiological effects in plants is, (d) higher respiratory rate due to injury, le) promotion of abscission of fruits, 6) elongation of genetically dwarf plants, (a) shortening of genetically tall plants, 329, 10. Which of the following induces flowering in long day, plants ?, (a) gibberellin, (c) cytokinin, 11. Which of the following is capable in delaying, (c) auxin, (a) respiration, (6) photosynthesis, (e) perception of light stimulus, (d) transpiration, (d) ethylene, senescence?, (a) auxin, (c) cytokinin, 12. A detached leaf does not turn yellow for quite a long time, if it treated with:, (a) auxin, (b) gibberellins, (d) traumatins, (b) gibberellin, (a) auxin, (b) gibberellins, (d) ethylene, (d) fats, ©) enzymes, 1 Plants bend towards light because :, a) they need light for photosynthesis, b) they need light for photorespiration, (c) cytokinin, 13. Which of the following hormone is chiefly concerned, with the cell division in plants?, (а) IAA, (c) 2, 4-D, 14. Seedless fruits can be obtained by treating the pollinated, ovaries with :, (a) colchicine, (c) hormones, 15. Pineapple can be made to flower off-season by the, application of:, (а) zeatin, (c) short days, 16. Which of the following is growth inhibitor?, (6) light attracts them, (d) cells on the shaded side elongate more, (b) Zeatin, (d) GA3, A Phototropism in shoot is attributed to :, (b) gibberellin, (d) abscisic acid, (b) lanolin, (d) enzymes, 1) auxin, ) cytokinin, & Geotropic responses shown by a horizontally growing, Toot is because :, (a) more auxin concentration in the stem, (b) ethylene, (d) low temperature, (b) more growth on the upper side of the root, (c) more growth of stem than root, (d) uniform growth of root on all sides, Apical dominance in higher plants is due to :, (a) hormones, (а) IAA, (b) АВА, (c) NAA, 17. The effect of day length on the development of plant is, (d) GA3, called :, (a) phototropism, (c) geotropism, 18. When a dark period of short day plant is interrupted by a, brief exposure to light, the plant :, (a) will not flower at all, (b) flowers immediately, (c) flower immediately, (d) turns into a long day plant, 19. The application of high concentration of synthetic, auxins on plants :, (a) kills them, (b) causes phototropism, (c) prevents lateral buds to grow, (d) controls cell division, 20. Auxanometer is meant for measuring :, (a) rate of transpiration, (c) width of stem, 21. The unusual growth of rice plants was caused by, gibberellins secreted by fungus was proved by :, (a) Skoog, (c) Kurosawa, (b) photorespiration, (d) photoperiodism, (b) enzymes, (6) phytochrome, (d) photoperiodism, Phenomenon underlying this is:, (a) tropic movement, (b) hormonal imbalance, e) apical dominance, 4) auxin decreases, 1b) auxin increases, le) abscisic acid decreases, gibberellic acid decreases, (b) growth of cell, (d) length of stem, sed by gibberellic acid?, (b) Miller, (d) Coombe

Page 4 : 42. A long day plant flowers only when it is exposed, 40. To increase sugar production in sugarcanes, they, (b) light more than critical day length, effect and then the stimulus is translocated, GRB New Era Biology: Class-XI (Pe, 34. Which part to the plant is concerned with vemalin, 36. GAS induce de novo synthesis of enzyme in bartey, 37. Apples are generally wrapped in waxed paper to:, 330, 22. Which of the following scientists isolated gibberellins?, (a) Skoog and Miller, (c) Yabuta and Sumiki, parts?, (а) Root apeх, (b) Letham, (b) Stem apex, (d) None of these, (d) Leaf apex, 23. Acetyl coenzyme-A is used in the synthesis of :, (a) cytokinins, (c) auxins, 24. Which of the following hormones are responsible for, "Bolting and flowering' phenomenon?, (а) auxins, (c) maleic hydrazide, 25. Kinetin (6- furfuryl aminopurine) was isolated from, yeast DNA by :, (а) Miller, (c) Leaf base, 35. Who coined the term vernalization?, (b) gibberellins, (d) ethylene, (b) Gregory, (a) Melchers, (c) Lysenko, (d) Lang, (b) АВА, (d) gibberellins, (a) amylase, (b) lipase, (c) sucrose, (d) maltase, (NCERT Exempe, (b) Letham, (a) prevent sunlight for changing its colour, (b) prevent aerobic respiration by checking the e, of O2, (c) Leonard, (d) Devlin, 26. Cell division and the related DNA and RNA synthesis, during cell division is controlled by :, (a) ABA, (c) prevent ethylene formation due to injury, (d) make the apples look attractive, 38. The term synergistic action of hormones refers to:, (b) ethylene, (c) auxins, (d) cytokinins, 27. In Lactuca sativa, one of the following hormones can, substitute for red light requirement in breaking the, dormancy of seeds:, (a) gibberellins, (NCERT Exemp, (a) when two hormones act together but bring ubu, (c) auxins, 28. Who proved that the detached leaves of Xanthium, the, senescence was delayed by the application of kinetin?, (a) Khan and Tolbert, (b) morphactins, (d) cytokinins, opposite effects, (b) when two hormones act together and contribute, the same function, (c) when one hormone affects more than one funcn, (b) Haber and Tolbert, (c) Richmond and Lang, 29. One of the following is used in the synthesis of ethylene:, (d) when many hormones bring about any, function, (d) Evenari, (a) methionine, 39. Plasticity in plant growth means that:, (b) valine, (d) proline, 51, (NCERT Exemp, (c) glycine, 30. The inhibitory effect of dormins (ABA) can be overcome, by gibberellins. The term dormin was suggested by:, (a) Osborne, (a) plant roots are extensible, (b) plant growth is dependent on the environme, (c) stems can extend, (b) Wareing, 52, (c) Noggle, 31. The term cytokinin was suggested by:, (a) Miller and Skoog, (d) Shannon, (d) none of the above, sprayed with:, (a) IAA, (b) cytokinin, (c) gibberellin, (d) ethylene, 41. ABA acts antagonistic to:, (a) ethylene, (c) gibberellic acid, (NCERTE1emp, (b) Skoog, Strong and Miller, (c) Osborne, 53, (d) Letham, 32. Indicate auxin which serves as rooting hormone:, (a) indole-3-butyric acid, (b) indole-3-propionic acid, (c) naphthalene acetic acid, (d) all of the above, 33. Who suggested that low temperature induces the, formation of a growth substance vernalin?, (a) Chang, (NCERTExmp, (b) cytokinin, (d) IAA, 54., 55., (AMU, 56., (b) Purvis, (a) red light, (c) Melchers, (d) Schwabe, (c) light equal to critical day length, (d) light less than critical day length

Page 5 : a Hormone that breaks dormancy of seed/potato tuber is:, Type of plants that come to flower after exposure to short, Growing trees and shrubs in small pots is : (AFMC 2002), Fruit ripening is promoted by:, Eitylene is employed for:, 331, (c) ripening of fruit, (d) none of the above, 57. Pruning of plants promotes branching due to, sensitization of axillary buds by:, (a) IAA, (c) gibberellin, 58. ABA, a stress related hormone also:, (a) accelerates fruit ripening, (AIPMT 2001), (b) ABA, (a) IAA, (d) gibberellin, (c) zeatin, Which one prevents premature fall of fruit?, (AIIMS 2004), (b) ethylene, (d) cytokinin, (AIPMT 2001), (b) Ethylene, (a) NAA, (c) GA3, Photoperiodic stimulus is picked up by:, (a) phytohormones, (c) phytochrome, A Hormone responsible for ageing is:, (a) GA, (AIEEE 2004), (d) Zeatin, (BHU 2001), (b) stimulates cell divisions, (b) stomata, (c) aids in fruit development, (d) helps in stomatal closure, 59. Which hormone is not translocated?, (a) auxin, (d) enzymes, (AIPMT 2001), (AMU 2005), (b) IAA, (b) gibberellins, (d) cytokinin, 60. Growth in length of a plant can be measured by:, (c) ABA, (d) cytokinin, (c) ABA, . Cytokinin synthesis is maximum in :, (b) leaves, (DPMT 2001), (a) roots, (JKСМЕЕ 2005), (d) fruit, (a) clinostat, (b) manometer, (c) shoot tip, & What is true about phytochrome?, (a) Pr absorbs red light and becomes Pfr, (c) auxanometer, 61. Treatment of seeds at low temperature under moist, conditions for breaking their dormancy is :, (AIIMS 2001), (d) potometer, (b) Pr absorbs yellow light and becomes Pfr, (c) Pfr absorbs yellow light and becomes Pr, (d) Pfr absorbs red light and becomes Pr, . Antigibberellin is:, (a) cycocel, (AIPMT 2006), (a) vernalization, (b) chelation, (c) stratification, (d) scarification, (BHU 2002), 62. Gibberellins are:, (КСЕТ 2006), (b) plastoquinone, (d) ubiquinone, (c) IAA, (a) proteinaceous, (b) amines, (c) acidic, (d) alkaline, . Bud dormancy is induced by:, (a) IAA, (AIIMS 2002), 63. Avena curvature test is bioassay for activity of:, (b) GA, (d) ethylene, (c) ABA, (AIIMS 2006), (a) auxin, (c) cytokinin, 64. Etiolation occurs when plants:, (a) are grown in dark, (b) are grown in intense light, (c) develop viral infection, (d) develop mineral deficiency, 65. In a growth curve of a plant, maximum growth is, observed during:, (a) lag phase, (c) decline phase, 66. Coconut milk is widely used in tissue culture because it, contains :, L. Vemalization occurs in response to:, (a) high light intensity, (c) high temperature, (b) ethylene, (d) gibberellin, (DPMT 2002), (b) low temperature, (CET Chd. 2006), (d) low light intensity, photoperiods followed by long photoperiods:, (AMU 2002), (a) Intermediate plants, (c) SLDP, (b) Day neutral plants, (d) LSDP, (КСЕТ 2007), (a) bonsai, (b) senescent phase, (b) culture, (d) tree culture, (c) green gardening, vibberellin was first isolated from:, a) scutellum of rice, (d) exponential phase, (AIEEE 2002), (AFMC 2007), ) barley endosperm, (d) moss sporophyte, (DPMT 2002), (b) parasitic fungus, (b) cytokinin, (d) ethylene, (a) auxins, (c) gibberellin, 67. Importance of day length in flowering of plants was first, shown in:, (a) CO2, (c) nitrogen, (b) SO2, (d) ethylene, (AIPMT 2008), (b) Petunia, (d) tobacco, (CPMT 2003), (a) cotton, ) stimulation off cell division, b) increasing height, (c) Lemna