The concentration of oxygen and carbon dioxide in deoxygenated blood is-

Q. Capillaries exchange the following between blood and tissues:
(a) oxygen, carbon dioxide, nitrogen, plasma
(b) oxygen, carbon dioxide, food, wastes
(c) water, plasma, WBC, RBC
(d) oxygen, carbon dioxide, WBC, RBC

Q. Carbon and oxygen react to produce carbon dioxide. What is the weight of oxygen required to convert $1.5g$ of carbon to carbon dioxide?

Q. Which of the following represents photosynthesis?
(a) water + oxygen----> carbon dioxide + carbohydrate
(b) carbon dioxide + water---->oxygen + carbohydrate
(c) carbohydrate + oxygen---> water + oxygen
(d) carbon dioxide + oxygen---> water + carbohydrate

Q. Oxygen and carbon dioxide are transported in blood through.