JIPMER 2016
- Exam
- JIPMER
- Year
- 2016
- Subject
- Botany
- Chapter
- Plant - Growth and Development
JIPMER 2016 · Botany · Plant - Growth and Development
Compare the statement I and II and choose the correct option....
Compare the statement I and II and choose the correct option.
Statement I In the flowering plants due to higher accumulation of auxins dormancy of lateral buds occurs.
Statement II In Maryland Mammoth (a tobacco variety) flowering occurred at different time at different latitude due to gibberellin concentration.
Options
- AStatement I is true, but II is false
- BStatement I is false, but II is true
- CBoth statements are true
- DBoth statements are false
Correct answer
A. Statement I is true, but II is false
Step-by-step solution
Auxin is responsible for apical dominance in apical buds, which inhibits the lateral buds to grow.
Plants require a certain day length to flower. This relative length of day and night needed for flowering is called as photoperiod. The effect of photoperiod or daily duration of light hours and dark periods on the growth and development of plants, especially flowering, is called photoperiodism.
This phenomenon was first discovered by Garner and Allard (1920, 1922) on Maryland Mammoth variety of tobacco. They observed that the Maryland Mammoth could be made to flower only by reducing the light hours with artificial darkening. It could be made to remain vegetative in winter by providing extra light.