Mention any two structural modifications in small intestine which helps in absorption
Answers
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♦ Features of the small intestine make it efficient at absorption of digested food:
1) The small intestine is long: this ensures food remains in the small intestine long enough for the products of digestion to be fully absorbed into the bloodstream.
2) Villi: -These are finger like projections protruding out from the inner lining of small intestine . They increase the surface area of small intestine to absorb more nutrients.
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Answer:
Tyndall effect. 3
29. (a) Compare the length of small intestine in herbivore and carnivore animals. 3
(b) Mention any two structural modifications in small intestine which help in absorption.
30. Name the substance oxidised and the substance reduced, and also identify the oxidising
agent and reducing agents in the following reactions : 3
(a) 3MnO2 + 4A1 3 Mn + 2Al2O3
(b) Fe2O3 + 3CO 2Fe + 3CO2
(c) SO2 + 2H2S 3S + 2H2O
Give reasons for the following :
(a) All decomposition reactions are endothermic reactions.
(b) Colour of copper sulphate solution changes when an iron nail is dipped in it.
(c) Respiration is an exhothermic reaction.
31. An element A reacts with water to form a compound B which is used in white washing. The
compound B on heating forms an oxide C which on treatment with water gives back B.
Identify A, B and C and give the reactions involved. 3
32. What would you observe when zinc is added to a solution of iron (II) sulphate? Write the
chemical reaction that takes place. 3
33. Where should an object be placed in front of a concave mirror of focal length 20 c