______________ is the process in which a substance combines chemically with oxygen with simultaneous evolution of heat and light.
Reduction
Combustion
Burning
Rusting
Percentage by volume of oxygen in air is
78.1%
20.1%
0.03%
0.93%
------------ is the mixture of several gases.
Air
Carbon dioxide
Fuel
Nitrogen.
____________ in the plants takes place through roots, stems and leaves.
Respiration
Oxidation
Aeration
____________ showed that air mainly consists of oxygen and nitrogen gases.
Antoine Lavoisier
Daniel Rutherford
Joseph Priestley
Coral scheel
___________ is used on stage to produce the effect of clouds.
Carbondioxide gas
Solid carbon dioxide
Liquid ammonia
Liquid Oxygen
___________ is also called internal respiration.
Breathing
Cellular respiration
The air we breathe in is called _______________ air.
Liquidated
Exhaled
Inhaled
Gaseous
The process of taking oxygen into cell using it for producing energy and removing the gaseous waste products is termed as
Transpiration
Evaporation
____________ is the process in which a substance combines chemically with oxygen at a temperature with the evolution of large amounts of heat and light in a short time.
