Ques.1:- How are fats digested in our body? Where does this process take place?
Ques. 2:- What is the role of saliva in the digestion of food?
Ques 3:- What are the necessary conditions for autotrophic nutrition and what are its by- products?
Ques.4:- How are the alveoli maximise the exchange of gases?
Ques. 5:- What would be the consequences of a deficiency of haemoglobin in our body?
Ques.6:- Describe double circulation of blood in human beings. Why is it necessary?
B) Write the difference between of the following-
1) Autotrophic nutrition and Heterotrophic nutrition.
2) Respiration and Breathing
3) Arteries and Veins
4) Photosynthesis and Human respiration
Answers
Answer:The digestive functions of saliva include moistening food,and helping to create a food bolus, it can be swallowed easily.
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Explanation:
Answer:
1. How are fats digested in our body? Where does this process take place?
Fats are present in the form of large globules in the small intestine. ... The bile salts (from the liver) break down the large fat globules into smaller globules so that the pancreatic enzyme lipase can easily act on them. This is referred to as emulsification of fats. This process takes place in the small intestine.
2. What is the role of saliva in the digestion of food?
The digestive functions of saliva include moistening food, and helping to create a food bolus, so it can be swallowed easily. Saliva contains the enzyme amylase that breaks some starches down into maltose and dextrin. Thus, digestion of food occurs within the mouth, even before food reaches the stomach.
3. What are the necessary conditions for autotrophic nutrition and what are its by- products?
Autotrophic nutrition takes place through the process of photosynthesis. Carbon dioxide, water, chlorophyll pigment, and sunlight are the necessary conditions required for autotrophic nutrition. Carbohydrates (food) and O2 are the by-products of photosynthesis.
4.How are the alveoli maximise the exchange of gases?
The alveoli are thin walled and richly supplied with a network of blood vessels to facilitate exchange of gases between blood and the air filled in alveoli. They have balloon – like structure that provide maximum surface area for exchange of gases.
5. What would be the consequences of a deficiency of haemoglobin in our body?
Haemoglobin is the respiratory pigment that transports oxygen to the body cells for cellular respiration. Therefore, deficiency of haemoglobin in blood can affect the oxygen supplying capacity of blood which leads to deficiency of oxygen in the body cells. It can also lead to a disease called anaemia.
6. (a) Describe double circulation of blood in human beings. Why is it necessary?
During a single cycle blood goes twice in the heart which is known as double circulation. It is necessary in human being to separate oxygenated and de-oxygenated blood because this makes their circulatory system is more efficient and helps in maintaining constant body temperature.
6.(b) Write the difference between of the following-
1) Autotrophic nutrition and Heterotrophic nutrition.
2) Respiration and Breathing
3) Arteries and Veins
4) Photosynthesis and Human respiration
1)
food is prepared from co2 ,water,sunlight. 2) food cannot be prepared from co2 ,water,sunlight. 3) green plants and certain bacteria have autotrophic mode of nutrition. 3) all the animals and fungi,most bacteria have heterotrophic mode of nutrition.
2) Breathing is the physical process where you inhale and exhale air in and out of your lungs. ... Respiration is a chemical reaction where Oxygen is used to breakdown Glucose in order to generate energy which is then used by the cell to function.
3) the arteries carry oxygenated blood to all body parts, whereas, veins carry the deoxygenated blood to the heart.
4) Photosynthesis involves the use of energy from sunlight, water and carbon dioxide to produce glucose and oxygen. Cellular respiration uses glucose and oxygen to produce carbon dioxide and water. ... For example, both processes synthesize and use ATP, the energy currency.