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Discuss the role of the pancreas and bile juice in the digestion of food in human beings.
The pancreas secretes pancreatic juice containing enzymes like amylase, trypsin, and lipase that help digest carbohydrates, proteins, and fats. Bile juice, produced by the liver and stored in the gall bladder, emulsifies fats into small droplets, making it easier for lipase to act on them for compleRead more
The pancreas secretes pancreatic juice containing enzymes like amylase, trypsin, and lipase that help digest carbohydrates, proteins, and fats. Bile juice, produced by the liver and stored in the gall bladder, emulsifies fats into small droplets, making it easier for lipase to act on them for complete digestion.
See less“The length of the small intestine in various animals depends on the food they eat.” Justify the statement.
Herbivores like cows and rabbits eat plant food, which is rich in cellulose and hard to digest, so they have a longer small intestine for complete digestion and absorption. Carnivores like tigers and lions eat protein-rich, easily digestible food, so they have a shorter small intestine.
Herbivores like cows and rabbits eat plant food, which is rich in cellulose and hard to digest, so they have a longer small intestine for complete digestion and absorption. Carnivores like tigers and lions eat protein-rich, easily digestible food, so they have a shorter small intestine.
See lessA student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his text book. Which of the following statements is correct?
ANSWER: [A] Explanation: Correct option: (a) The near point of his eyes has receded away. The student can clearly see the blackboard but cannot read his textbook, which means he suffers from hypermetropia (farsightedness). In this defect, the near point of the eye shifts farther away than normal, maRead more
ANSWER: [A]
Explanation: Correct option: (a) The near point of his eyes has receded away. The student can clearly see the blackboard but cannot read his textbook, which means he suffers from hypermetropia (farsightedness). In this defect, the near point of the eye shifts farther away than normal, making nearby objects appear blurred.
See lessTo get an image of magnification – 1 on a screen using a lens of focal length 20 cm, the object distance must be:
ANSWER: [C] Explanation: Correct option: (c) 40 cm. To obtain an image of magnification M = − 1, the image must be real, inverted and of the same size as the object. This happens when the object is placed at twice the focal length of a convex lens. The given focal length is f = 20 cm. Hence, the objRead more
ANSWER: [C]
Explanation: Correct option: (c) 40 cm. To obtain an image of magnification M = − 1, the image must be real, inverted and of the same size as the object. This happens when the object is placed at twice the focal length of a convex lens. The given focal length is f = 20 cm. Hence, the object should be placed at 2f = 40 cm. At this position, the image is formed on the opposite side of the lens, also at 40 cm, with the same size as the object but inverted.
See lessThe aluminium sheets used in building roofs do not rust, but their surfaces turn dull over time. (i) Why does aluminium not rust like iron? (ii) How can the dull appearance of aluminium be prevented? (iii) Why is aluminium preferred for roofing over iron sheets?
(i) Aluminium forms a thin protective oxide layer (Al₂O₃) on its surface when exposed to air. This layer prevents further corrosion, unlike iron which forms rust (Fe₂O₃·xH₂O) that flakes off. (ii) The dull appearance can be prevented by polishing or anodizing the aluminium surface to maintain its shRead more
(i) Aluminium forms a thin protective oxide layer (Al₂O₃) on its surface when exposed to air. This layer prevents further corrosion, unlike iron which forms rust (Fe₂O₃·xH₂O) that flakes off.
(ii) The dull appearance can be prevented by polishing or anodizing the aluminium surface to maintain its shine and protect it from corrosion.
(iii) Aluminium is lightweight, corrosion-resistant, and durable, making it ideal for roofing, whereas iron sheets are heavier and prone to rusting, requiring more maintenance.
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