CLASS 7

Topic -Respiration

Worksheet 1Fill in the blanks.1. Every organism requires _________ to carry out the life processes.2. _________is a vital process which involves the inhalation of oxygen-rich air and exhalationof air rich in carbon dioxide.3. Breathing is called _________respiration.4. The process of exchange of gases in the cells is known as _________respiration.5. The hair present in the nostrils trap any _________particles present in the inhaled air.6. The inhaled air passes from the _________into the nasal cavity.7. Trachea is guarded by an opening called the _________.8. The trachea divides into two tubes called _________which enter the lungs.9. Lungs are _________in colour and spongy due to the presence of air spaces and a largenumber of blood capillaries filled with blood.10. The lungs are protected in the rib cage and supported by the _________.Worksheet 2Say whether these statements are TRUE or FALSE. Also, correct the false statements.1. Breathing is a physical process that involves inhalation and exhalation.______________________________________________________________
2. During inhalation, the diaphragm moves downwards and the chest cavity moves outwards creating space for the air to enter into the lungs.______________________________________________________________
3. The expansion and relaxation of blood during breathing also causes slight visible movement in the abdominal area._____________________________________________________________
4. Breathing rate is the number of times air is inhaled or exhaled in a minute.______________________________________________________________
5. The temperature of the exhaled air is not the same as the temperature of the body.______________________________________________________________
6. Yawning helps to get in extra amount of oxygen and expel carbon dioxide.______________________________________________________________
7. Haemoglobin present in blood gets bound to oxygen and forms oxyhaemoglobin.____________________________________________________________
8. Carbon dioxide produced during respiration is carried to the lungs through the blood forexhalation.______________________________________________________________
9. Some organisms such as yeast and bacteria do not use oxygen for respiration.______________________________________________________________
10. The process of oxidation of food with the help of oxygen present in air to release energy is called aerobic respiration.