Plant growth and development - plant hormones auxin gibberellin cytokinin ethylene abscisic acid photoperiodism vernalization - Question Bank
1. The inhibition of lateral bud growth by the terminal bud is known as apical dominance and is primarily mediated by:
2. Which hormone is synthesized in the developing seeds and plays a role in embryo development and seed dormancy?
3. The term 'phytochrome' is most closely associated with the plant's ability to perceive:
4. Which plant hormone promotes the formation of female flowers in certain species like cucumber?
5. The hormone that counteracts the effect of ABA in breaking seed dormancy is:
6. Which of the following is NOT a characteristic of etiolated plants?
7. The phenomenon of flowering in plants like soybeans, which flower irrespective of the day length, indicates they are:
8. Which hormone plays a role in the formation of adventitious roots on stem cuttings?
9. Which hormone is essential for the formation of vascular tissues (xylem and phloem)?
10. The process of breaking seed dormancy by exposing seeds to cold temperatures is known as:
11. A plant that flowers in response to a continuous night of 8 hours and a day of 16 hours would be classified as a:
12. Ethylene promotes abscission (shedding) of:
13. Which hormone is synthesized primarily in the developing leaves and seeds?
14. The phenomenon where roots grow away from light and shoots grow towards light is called:
15. Which hormone is involved in delaying senescence and maintaining the 'greenness' of leaves?
16. The process of moving a plant from a cold environment to a warm environment to induce flowering is an example of:
17. Which of the following is a critical factor in determining whether a plant is a short-day, long-day, or day-neutral plant?
18. Ethylene is produced in:
19. The concentration of which hormone is high in dormant seeds and buds?
20. Which hormone promotes bolting (elongation of the internodes) in plants like cabbage?
21. Auxin is synthesized in:
22. What is the primary role of phytochrome in photoperiodism?
23. Vernalization is a process that ensures flowering occurs:
24. Photoperiodism plays a crucial role in regulating:
25. Which hormone is often referred to as the 'stress hormone'?
26. Cytokinins primarily affect cell division and differentiation in:
27. The 'triple response' in seedlings, characterized by inhibition of stem elongation, thickening of stem, and horizontal growth, is induced by:
28. Which plant hormone can break seed dormancy and promote germination?
29. The synthesis of Gibberellins occurs mainly in:
30. Which hormone is involved in stomatal closure during water stress?
31. The phenomenon of etiolation in plants grown in darkness is characterized by:
32. Which hormone is synthesized in the root tips and transported upwards?
33. Which of the following is NOT a function of Auxin?
34. The pigment involved in detecting photoperiod is:
35. Day-neutral plants are plants that:
36. Long-day plants are those that flower when:
37. Short-day plants are those that flower when:
38. The process of leaf senescence (aging) is generally promoted by:
39. Which hormone promotes the formation of callus and adventitious roots in tissue culture?
40. The 'foolish seedling' or 'bakanae' disease of rice seedlings is caused by excessive production of which hormone?
41. Seed dormancy is often maintained by which plant hormone?
42. Which hormone can be used commercially to promote flowering in pineapple plants?
43. The phenomenon of apical dominance, where the terminal bud grows preferentially, is primarily regulated by:
44. Vernalization is a process by which a plant's flowering is promoted by:
45. Photoperiodism is the plant's response to:
46. Abscisic Acid (ABA) is generally considered a:
47. Which gaseous plant hormone is most famous for accelerating fruit ripening?
48. Cytokinins are plant hormones that primarily promote:
49. Gibberellins are known for their role in promoting which of the following processes?
50. Which plant hormone is primarily responsible for cell elongation and root formation?