Science Class 7th

41. Respiration is an Important process by which the body takes in life saving oxygen and releases the ________.

A) Carbon dioxide

B) Methane gas

C) Nitrogen

D) None of these

42. Breathing is a physical process, where gases are exchanged between the body and the surrounding with help of the _____________

A) Respiratory system

B) Digestion

C) Exhaling

43. Respiration or breathing is the _______ step, in which oxygen is taken in and carbon dioxide is released.

A) First

B) Second

C) Third

D) None of these

44. Nose consists of two cavities called_________.

A) Nostrils

B) Glottis

C) Trachea

45. Nostrils remain moist due to the presence of _________.

A) MucusĀ 

B) Saliva

C) Both a & b

D) None of these

46. The _______ in the nostrils capture dust particles from the air inhaled and clean it.

A) Hairs

B) Organs

C) Cavity

D) NoneĀ  of these

47. Larynx is located in the _______.

A) Neck

B) Nose

C) Stomach

D) None of these

48. Larynx contain vocal cords which are_________ producing organs.

A) Sound

B) Water

C) Music

D) None of these

49. Trachea is also called the ______.

A) Wind pipe

B) Bronchus

C) Lungs

D) None of these

50. The opening of the trachea is called the glottis, which is covered by a flap called ____________.

A) Epiglottis

B) Glottis

C) Bronchioles

D) None of these

51. The trachea divides into two branches in the chest cavity, called______.

A) Bronchi

B) Esophagus

C) Lungs

D) None of these

52. Each bronchus enters into a lung and divides into smaller tubes called bronchioles which open into air sacs called _________.

A) Alveoli

B) Glottis

C) Both a& b

D) None of these

53. Each alveolus is surrounded by many ______.

A) Capillaries

B) Arteries

C) Trachea

D) None of these

54. Each lung consists of around 700 million ________which are surrounded by blood capillaries.

A) Alveoli

B) Trachea

C) Bronchus

D) None of these

55. Diaphragm is a very thick, dome shaped muscular membrane which separates the chest cavity from the ______.

A) Glottis

B) Abdominal cavity

C) Pharynx

D) None of these

56. When we inhale, the muscles between the ribs and diaphragm contract to expand the ________.

A) Chest cavity

B) Abdominal cavity

C) Pharynx

D) None of these

57. When we exhale, the diaphragm and muscles between the diaphragm and the ribs relax and come into a _________.

A) Resting position

B) Tired position

C) Both a & b

D) None of these

58. _______process energy release is vigorous and not under control.

A) Burning

B) Breathing

C) Enzymes

D) Both a & b

59. ______process energy release is slower and under control.

A) Breathing

B) Burning

C) Enzymes

D) Both a & b

60. Cellular respiration is a slow process which occurs at_______.

A) Body temperature

B) Climate temperature

C) Normal temperature

D) None of these