NSO Level 2 Class 7 Science Paper 2013 − 14 Higher Questions and Answers Part 5

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Question 49:

Read the given passage with a mistake and select the option that corrects it.

During the process of breathing (inhalation) , the diaphragm muscles contract and becomes dome shaped. At the same time, intercostal muscles contract to pull the ribs upwards. This increases the volume of the chest cavity. Subsequently the volume of lungs increases. As the air pressure in the lungs decreases, air moves into the lungs through the air passage.

(A) The diaphragm muscles contract and become flat.

(B) This decreases the volume of the chest cavity.

(C) As the air pressure in the lungs increases, air moves into the lungs through the air passage.

(D) At the same time, intercostal muscles contract to pull the ribs downwards.

Question 50:

The given graph shows the amount of undigested food in the human digestive system over time.

Graph

(i) Which part of the digestive system does point b to point c represent?

(ii) Which component of food is broken from point a to point b?

(A) (i) - Stomach, (ii) - Protein

(B) (i) - Oesophagus, (ii) - Carbohydrate

(C) (i) - Oesophagus, (ii) - Fat

(D) (i) - Small intestine, (ii) - Glucose

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