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51.

Our breathing rate will be lowest when we are:

A.	Playing football	B.	Eating
C.	Sleeping	D.	Delivering orders

52.

Oxygen percentage in the inhaled air is about:

A.	21%	B.	16%
C.	79%	D.	4%

53.

The blood absorbs oxygen in respiration with one of these:

A.	RBCs production in his body will step up	B.	WBCs
C.	Plasma	D.	Platelets

54.

The number of oxygen molecules associating with haemoglobin in man is:

A.	One	B.	Two
C.	Three	D.	Four

55.

The concentration of carbonic acid does not increase in our blood because of the presence of which of the following:

A.	Sodium ions	B.	Potassium ions
C.	Calcium ions	D.	None of these

56.

Cellular respiration in man and other vertebrates in includes:

A.	Embden Meyerhof pathway	B.	Kreb's cycle only
C.	Both (a) & (b)	D.	None of these

57.

Embden Meyerhof pathway is also called:

A.	Glycolysis that occurs anarobically	B.	Kreb's cycle that occur aerobically
C.	Transport of CO2 in the blood	D.	Electron transport system

58.

Which of these steps occur during Glycolysis:

A.	Activation of glucose	B.	Cleavage
C.	Oxidation	D.	All of these

59.

During activation of glucose in Glycolysis, the end product formed is:

A.	Fructose 1, 6 diphosphate	B.	Dihydroxyacetone phosphate
C.	Pyruvic acid	D.	Citric acid

60.

In the first state of Glycolysis called activation the endproduct formed from glucose is:

A.	Glucose-6-phosphate	B.	Fructose-6-phosphate
C.	Fructose, 1, 6, diphosphate	D.	None of these