NTA Abhyas NEET2020BotanyPlant - Growth and DevelopmentPractice
When all parts except the leaves of a short-day plant are covered with a light-proof cover and then subjected to short daylight/dark treatment, it will produce flower buds. When a portion of this plant is grafted on to another plant of the same species which has been prevented from flowering by excessive exposure to light, this latter plant will also produce flower buds. Which is the best inference from this result?
Options
- AHormones can transmit information to all parts of plants
- BLeaves are more sensitive to the photoperiodic stimulus than other parts of the plant
- CThe photoperiodic stimulus is received by the leaves and transmitted by a hormone.
- DThe photoperiodic stimulus is received by all parts of the shoot and transmitted by a hormone.
Correct answer
C. The photoperiodic stimulus is received by the leaves and transmitted by a hormone.
Step-by-step solution
Auxin hormone is responsible for photoperiodism. The photoperiodic stimulus is received by the leaves and transmitted by auxin hormone.