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.