Q. Tobacco weakens walls of

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Q. Efficient respiration is done in Hydra by help of

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Q. Most important metabolic activities of all organisms is

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Q. Inflammatory chemicals which give rise to severe contractions of bronchioles in asthma are

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Q. Ribs and intercoastals muscles constitute walls of

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Q. General names for group of diseases is

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Q. Tuberculosis is a disease which is

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Q. Muscles fibers have iron containing protein called

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Q. Mammals which can stay under ocean for more than two hours without coming up for air are

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Q. One liter of air contain oxygen about

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Q. In a tobacco leaf, there are 12000 stomata per square

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Q. Breakdown of alveoli is called

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Q. Organ which lie ventral to esophagus extending in chest cavity is a tubular structure called

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Q. Capacity of human blood to carry oxygen is raised up to 75 times by

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Q. Lungs are

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Q. When air rushes into vacuum inside of lungs, it constitutes process of

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Q. Maximum oxygen can be absorbed at a level of

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Q. Asthmatic patients are prone to

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Q. Oxygen is less soluble as compare to carbon dioxide is

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Q. Exchange of gasses through diffusion takes place when there is a difference in

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