Tiêu đề PLANT GROWTH & DEVELOPMENT.pdf ✅

Plant Growth and Development  Digital www.allendigital.in [ 193 ] INTRODUCTION TO DEVELOPMENT 1. Auxanometer is meant for measuring - (1) Respiratory activity (2) Photosynthetic activity (3) Growth activity (4) Osmotic pressure 2. In plants growth is - (1) Restricted to certain regions or structure (2) Irreversible (3) Change in size (4) All the above 3. Plant growth is primarily affected by two climatic factors which are :- (1) Light and temperature (2) Temperature and relative humidity (3) Light and wind (4) Rainfall and temperature 4. In a growing plant, the first phase during the process of growth is - (1) Cell division (2) Cell enlargement (3) Cell differentiation (4) Cell maturation 5. The maximum growth rate occurs in :- (1) Exponential phase (2) Stationary phase (3) Senescent phase (4) Lag phase PLANT GROWTH REGULATORS TO SEED DORMANCY 6. Primary precursor of I.A.A is :- (1) Phenyl alanine (2) Tyrosine (3) Tryptophan (4) Leucin 7. The biological activity of I.A.A is tested by :- (1) -amylase test (2) Avena curvature test (3) Endosperm activity test (4) Chlorophyll preservation test 8. Indole, 3 acetic acid, called as auxin was first isolated from :- (1) Human urine (2) Corn germ oil (3) Fusarium (4) Rhizopus 9. Stem elongation is affected by :- (1) Gibberellin and florigen (2) Auxin and gibberellin (3) Florigen and kinin (4) Kinin and auxin 10. Apical dominance means :- (1) Suppression of growth of apical bud by axillary buds (2) Suppression of growth of axillary buds by the presence of apical bud. (3) Stimulation of growth of axillary buds by removal of apical bud (4) Inhibition of growth of axillary buds by removal of apical bud. 11. Which of the following is not a natural occuring plant hormone ? (1) 2, 4 - D (2) GA2 (3) Gibberellin (4) I.A.A 12. Auxin is mainly produced by - (1) Apical root meristem (2) Root cambium (3) Apical shoot meristem (4) Phloem in shoot tip 13. Plants bend toward the light because - (1) They need light for photosynthesis (2) They need light for respiration (3) Light attracts them (4) Cells on the shaded side elongate more 14. Growth hormone acts - (1) Always as growth promoters (2) Always as growth inhibitors (3) Some as promoters and some as inhibitors (4) Rarely as growth inducers 15. The movement of auxin is - (1) Acropetal (2) Basipetal (3) Lateral (4) Centripetal 16. Which growth hormone is responsible for apical dominance ? (1) Auxin (2) Cytokinin (3) Gibberellin (4) Ethylene Exercise - I
NEET : Biology [ 194 ] www.allendigital.in  Digital 17. Which of the following induces femaleness in plants ? (1) Ethylene (2) Ethanol (3) ABA (4) Gibberellin 18. Agent orange is- (1) Biodegradable insecticide (2) Dioxin weedicide (2,4-D + 2,4,5-T) (3) Biofertilizer (4) Biopesticide 19. Richmond - Lang effect is due to :- (1) Cytokinin (2) Auxin (3) ABA (4) Ethylene 20. Photoperiodic stimulus is picked up by : (1) Phytochrome (2) Phytohormone (3) Enzyme (4) Vernalin 21. Which of the following plant hormone substitutes for long photoperiod in flowering plant ? (1) Auxin (2) Gibberellin (3) Cytokinin (4) Ethylene 22. Cytokinin - (1) Is a hormone whose main function is to induce the cell division (2) Induce bolting (3) Induce senescence (4) Causes dormancy 23. Bolting hormone is - (1) Auxin (2) Gibberellin (3) ABA (4) Ethylene 24. Gibberellins do not cause - (1) Shortening of genetically tall plants (2) Stimulation of seed germination (3) Promotion of parthenocarpy (4) Induction of -amylase synthesis in barley 25. Gibberellins can promote seed germination because of their influence on : (1) Rate of cell division (2) Production of hydrolyzing enzymes (3) Synthesis of abscisic acid (4) Absorption of water through hard seed coat. 26. Which of the following is a coconut milk factor ? (1) Auxin (2) ABA (3) Morphactin (4) Cytokinin 27. In germinating seeds Amylase, Proteases, Lipases are stimulated by :- (1) Auxin (2) Gibberellin (3) Cytokinin (4) Ethylene 28. Which one of the following is a gaseous plant hormone ? (1) Auxin (2) Gibberellin (3) Ethylene (4) Cytokinin 29. Apical dominance can be overcome by application of :– (1) Auxin (2) Gibberellin (3) Cytokinin (4) Florigen 30. Dormancy of seed is broken by :- (1) Auxin (2) Gibberellins (3) Ethylene (4) Cytokinin 31. In tissue culture, differentiation of shoot is controlled by :- (1) Light Intensity (2) Temperature shock (3) Low Auxin to high CK ratio (4) High auxin to low CK ratio 32. Among the following which helps in ripening of fruits? (1) Methane (2) Ethylene (3) CO2 (4) CO 33. Abscisic acid induces :- (1) Shoot elongation (2) Cell elongation and cell wall formation (3) Cell division (4) Leaf fall and dormancy 34. Which of the following is growth inhibitor ? (1) IAA (2) ABA (3) NAA (4) GA3 35. Abscisic acid treatment results in - (1) Leaf expansion (2) Stem elongation (3) Stomatal closure (4) Root elongation
Plant Growth and Development  Digital www.allendigital.in [ 195 ] 36. Natural cell division inducing factor occurs in- (1) Coconut milk (2) Immature maize seeds (3) Both (1) and (2) (4) Heated t - RNA 37. Which is a stress hormone ? (1) Benzyl aminopurine (BAP) (2) Dichlorophenoxy acetic acid (3) Ethylene (4) Abscisic acid 38. Seed dormancy is due to the :- (1) Ethylene (2) Abscisic acid (3) IAA (4) Starch 39. Hormone responsible to induce senescence:– (1) ABA (2) Auxin (3) GA (4) Cytokinin 40. Long day plants produce flowers when they exposed to :- (1) Any duration of light (2) Light period longer than a critical day length (3) Light period longer than 12 hrs. (4) Short photoperiods than critical day length 41. Which plant is LDP ? (1) Tobacco (2) Glycine max. (3) Xanthium (4) Spinach 42. Wheat & henbane are :- (1) SDP (2) DNP (3) LNP (4) LDP 43. In short day plants (SDP) flowering is induced by:- (1) Long night (2) Photoperiod less than 12 hours (3) Photoperiod shorter than critical value and unniterrupted long night. (4) Long photoperiod and interrupted long night. 44. Which pigment absorbs the red and far–red light? (1) Cytochrome (2) Phytochrome (3) Carotenoid (4) Chlorophyll 45. Cell elongation in internodel regions of the green plants takes place due to :- (1) Ethylene (2) Indole acetic acid (3) Cytokinin (4) Gibberellins EXERCISE-I (Conceptual Questions) ANSWER KEY Question 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Answer 3 4 1 1 1 3 2 1 2 2 1 3 4 3 2 Question 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Answer 1 1 2 1 1 2 1 2 1 2 4 2 3 3 2 Question 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 Answer 2 2 4 2 3 3 4 2 1 2 4 4 3 2 4