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Q. 6What is the role of saliva in the digestion of food?Q.7What are the necessary conditions for autotrophicnutrition and what are its by-products?Q.8What are the differences between aerobic andanaerobic respiration? Name some organisms that0.9How are the alveoli designed to maximise theexchange of gases?Q. 10What would be the consequences of a deficiency ofhaemoglobin in our bodies? |
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Answer» 1. The digestive function of saliva include moistening food and helping to create a food bolus so it can be swallowed esily 2. Autotropic nutrition takes place by the process of photosynthesis. Water, sunlight, CO2, chlrorofill pigment are required for it. 3. Aerobic respiration -1.presence of oxygen. 2.waste product is CO2 and water. Anaerobic respiration -1.absence of oxygen. (1) Thedigestive functions of salivainclude moisteningfood, and helping to create afoodbolus, so it can be swallowed easily.Salivacontains the enzyme amylase that breaks some starches down into maltose and dextrin. Thus,digestion of foodoccurs within the mouth, even beforefoodreaches the stomach. (2) Autotrophic nutritiontakes place through the process of photosynthesis. Carbon dioxide, water, chlorophyll pigment, and sunlight are thenecessary conditionsrequired forautotrophic nutrition. Carbohydrates (food) and O2are the by-productsof photosynthesis. (3) 1) saliva mix with food and make it smooth to pass easily through alimentary canal it consists of an enzyme called salivery amylase which Help in breakdown of food deficiency of the haemoglobin can cause anaemia |
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