Cooking of rice at higher altitudes is difficult because

1. water boils at 100°
2. water boils at <100°
3. boiling point of water is constant
4. none of the above

Correct answer: (b) water boils at <100°C

Explanation: Boiling point of water is constant 100 ° C at STP but as we go higher in altitude the atmospheric pressure changes and decreases which affects the boiling point of water hence it's difficult to cook rice at higher altitudes.