Biology 9 Chapter 11 - Test 5

1. The oxidation of the absorbed food material in order to obtaion energy is called _______.


2. Some organisms oxidize their food without using any molecular oxygen. It is known as ________ respiration.


3. Even in the earobic respiration the first phase is _________.


4. The air spaces present between the cells of __________of leaves, stem and roots are involved in the gaseous exchange.


5. The roots get their oxygen for gaseous exchange through __________ from the air existing in the space between soil particles.


6. The gills are very effective for gaseous exchange in __________ animals.


7. A number of cavities called ________ open into the nasal cavity.


8. Every lung has about ________ million alveoli.


9. According to an estimate one hundred mol. of haemoglobin containing blood can transport _________ ml of oxygen.


10. Nicotine hardens walls of __________.


11. Lungs are enclosed in a double layered membrane called _________ membrane.


12. Oxygen does not combine covalently with haemoglobin. It is only loosely attached with haeme of the haemoglobin and is therefore forms oxyhaemoglobin but not __________.


13. The rate of breathing in human being is controlled by a center in the _________ which is sensitive to the changing concentration of carbon dioxide in blood.


14. The cigarette smoke damages the ___________ due to which the foreign particles instead of being trapped and eliminated can go to the lungs and produce infaction etc.


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