Question : Which of these is not essential for photosynthesis?
A. Sunlight
B. Oxygen
C. Water
D. Carbon dioxide
Question Listed : Plant, Tree, Oxygen,
Question : The gases used in different types of welding would include
A. oxygen and acetylene
B. oxygen, acetylene and argon
C. oxygen, hydrogen, acetylene and nitrogen
D. oxygen and hydrogen
Question Listed : Oxygen, Acetylene, Elements, Metals,
Question : For respiration in deep sea, divers use mixture of
A. Oxygen and nitrogen
B. Oxygen and carbon dioxide
C. Oxygen and hydrogen
D. Oxygen and helium
Question Listed : Gas, Helium, Oxygen,
Question : The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is
A. nitrogen
B. oxygen
C. hydrogen
D. carbon
Question Listed : Oxygen, Chemistry,