Question

32. Which of these contract to lift up ribs and sternum?
(1) Internal inter-costal muscles
(2) External inter-costal muscles
(3) Alveoli
(4) Diaphragm


33.' Montreal protocol is associated with
(1) Control of emission of ozone depleting substance
(2) Control of radioactive wastes
(3) Control of desertification
(4) Protection and management of forests


34. If the BOD level is below 1500 mg/L, then what
does it indicate about the pollution of water?
(1) Less pollution
(2) Moderate pollution
(3) High pollution
(4) No pollution


35. Which of the following is not a fresh water fish?
(1) Salmon
(2) Mrigal
(3) Catla
(4) Rohu


36. If adenine present in a DNA molecule is 30%, then
what will be the percentage of cytosine?
(1) 30%
(2) 20%
(3) 40%
(4) 10%​

Answer 1

Answer:

diaphragm contract &relaxation movement