Question

Assertion; Starch is hydrolyzed by ptyalin to maltose.
Reason; Sucrase hydrolyses sucrose to lactose.
A)Both the assertion and the reason is correct and the reason is the correct explanation of the assertion
B)both the Assertion and Reason are correct but the reason is not the correct explanation for the assertion
C)Assertion is correct but the reason is incorrect
D)Both assertion and reason are incorrect

Answer 1

The salivary amylase helps in digesting the starch. It is the first process of digestion of starch but it is less important than that of pancreatic amylase present in the small intestine. The starch is hydrolyzed by the mileage and produces the end products.

Complete answer:
-The member of the class of enzyme that is alpha-amylase splits a compound (starch) by adding water molecules into smaller carbohydrate molecules such as maltose. This process is known as hydrolysis.
-There are three types of amylases i.e. alpha, beta, and gamma. They all are different from each other on the basis of the bonds of the starch molecules that they catalyze.
-Among the living organisms alpha-amylase is found. The alpha-amylase is called ptyalin in the digestive system of humans and many other mammals. 6.7 - 7.0 is the optimum pH of the alpha-amylase.
-The pancreas secretes the pancreatic amylase into the small intestine
-The food present in the mouth is mixed with the ptyalin and there they act upon starches. Until the food is mixed with the stomach secretions, this action is continued up to several hours in the stomach.
-The ingested starches (near 30-40 percent) broke down to Maltose by ptyalin under optimal conditions during digestion in the stomach.
-The remainder of the starch molecules are catalyzed by pancreatic amylase when food passes to the small intestine into small oligosaccharides and maltose.
-No rest of the work of digestion is done by the enzymes which are produced by the enterocytes i.e the lining of the small intestine, where the maltose is digested by the maltase forming two glucose molecules.
-Lactose digested by lactase and produces glucose and galactose.
-The sucrose is digested by sucrase forming glucose and fructose.
-So, by the end of the process of enzymatic digestion, we are left with the three monosaccharides i.n glucose, fructose, and galactose.
-And now, this can be absorbed across the enterocytes of the small intestine and into the bloodstream to be transported to the liver.
So, the correct answer is, "Assertion is correct but the reason is incorrect".

Note: -In the liver, the fructose and the galactose are converted into glucose passed through the liver when absorbed.
-The main form of carbohydrate which circulates in the bloodstream is glucose.