JEE Advanced Chemistry: Plant Physiology questions with solutions

Q1. Which gas is responsible for the turgidity of flower buds through the osmosis/capillary mechanism?

1. Sodium dioxide
2. Carbon monoxide
3. Carbon dioxide
4. Nitrogen dioxide

Answer: Carbon dioxide

Carbon dioxide (CO2) dissolves in the aqueous solution inside plant cells to form carbonic acid, which increases solute concentration, lowers water potential, and maintains the osmotic pressure responsible for turgidity in flower buds.