NTA Abhyas NEET2020BotanyPlant - Growth and DevelopmentPractice
If the seedlings are grown in darkness,
Options
- Athey are of the same size as those grown in light
- Bthey are much healthier than those grown in light
- Cthey are similar to those grown in light
- Dthey are taller than those grown in light
Correct answer
D. they are taller than those grown in light
Step-by-step solution
The seedlings grown in darkness are taller due to the activity of auxin because auxin contents in darkness are high than light. A signal from the cell wall decides that, in the dark, seeds grow into long yellow sprouts, instead of turning green and forming leaves.