Give reasons for the following observation: The smell of hot sizzling food reaches you several meters away, but to get smell from cold food you have to go close.

Give reason for the following observations. We can get the smell of perfume sitting several meters away.

Cut a transverse section of young stem of a plant from your school garden and observe it under the microscope. How would you ascertain whether it is a monocot stem or dicot stem? Give reasons.