Answer:
Ans.
Mechanism of absorption for different molecules is as follow
(i) Small
amounts of monosaccharide?s like glucose, amino acids and some electrolytes
like chloride ions are generally absorbed by simple diffusion. The passage of
these substances into the blood depends upon the concentration gradient
(ii)
Fructose and some amino acids are absorbed with the help of carrier ions like 
. This mechanism
of transport is called facilitated transport or active transport.
(iii)
Transport of water depends on osmotic gradient.
(iv) Fatty
acids and glycerol being insoluble, cannot be absorbed into the blood. They are
first incorporated into micelles (smalll droplets) which move into intestinal
mucosa.
Further, they are
reformed into protein coated fat globules called chylomicrons which are
transported to the lymph vessels in the villi. These lymph vessels ultimately
release the absorbed substances into the blood stream.
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