Haemoglobin can be almost completely oxygenated by an oxygen pressure of __________ of mercury.
(A) 10 mm
(B) 60 mm
(C) 10 cm
(D) 100 mm
The maximum amount of oxygen which normal human blood absorbs and carries at sea level is ________ per 100 ml of blood.
(A) 10 ml
(B) 20 ml
(C) 30 ml
(D) 40 ml
Which of the following animals has a respiratory system with one way flow of the air through the lungs, and the air is renewed after inspiration?
(A) Cockroach
(B) Earthworm
(C) Aves
(D) Frogs
Which of the following promotes growth in plants?
(A) Photorespiration
(B) Calvin cycle
(C) Both of these
(D) None of these
Of the following, which one is a contagious disease?
(A) Tuberculosis
(B) Lungs cancer
(C) Asthma
(D) Emphysema