Science
Neha consumed boiled sweet potatoes and boiled eggs for breakfast. Help her to understand some steps in the process of digestion of the food taken by her by answering the questions given below.
Attempt either subpart A or B.
(a) Which of these food items is rich in proteins? In which part of the alimentary canal is the digestion of this component initiated? Name the enzymes, conditions required and the glands associated with the digestion here.
OR
(b) Which of these food items contains fats? How is it digested?
(c) Which of these food items is rich in starch? How is its digestion initiated?
(d) How will the digested food be taken up by the alimentary canal?
Answer
(a) Eggs are rich in proteins.
The digestion of proteins is initiated in the stomach and gastric glands present in the wall of the stomach release hydrochloric acid, a protein digesting enzyme called pepsin and mucus. The hydrochloric acid creates an acidic medium which facilitates the action of enzyme pepsin.
OR
(b) Eggs contain fats.
Bile juice from the liver breaks down large fat globules into smaller ones for increasing the efficiency of the enzymes and making the medium alkaline. Emulsified fats are digested by lipase secreted by pancreas.
(c) Sweet potatoes are rich in starch.
The saliva secreted by salivary glands present in buccal cavity contain an enzyme called salivary amylase that breaks down starch which is a complex molecule to give sugar.
(d) The digested food in the small intestine is absorbed by its inner lining, which has many tiny finger-like projections called villi.
These villi greatly increase the surface area for absorption and each villus contains fine blood capillaries and lymph vessels that take up the nutrients.
Related Questions
In a genetic experiment, plants with pure round green seeds (RRyy) were crossed with plants with wrinkled yellow seeds (rrYY).
(a) Show the gametes formed when F1 was self-pollinated.
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Neha consumed boiled sweet potatoes and boiled eggs for breakfast. Help her to understand some steps in the process of digestion of the food taken by her by answering the questions given below.
Attempt either subpart A or B.
(a) Which of these food items is rich in proteins? In which part of the alimentary canal is the digestion of this component initiated? Name the enzymes, conditions required and the glands associated with the digestion here.
OR
(b) Which of these food items contains fats? How is it digested?
(c) Which of these food items is rich in starch? How is its digestion initiated?
(d) The figure given below represents parts of the human alimentary canal. Which of these parts will have the maximum amount of digested food as soon as the process of digestion is completed?
Puneet wanted to grow banana plants.
(a) Based on your knowledge on plant reproduction should he opt for seeds or any alternate method of reproduction. Justify your answer.
(b) Offsprings of a banana plant usually show very little variation. What causes variation and are variations good or bad? Justify.
Annie was conducting research on the number of fruits produced by watermelon under different conditions. She grew 25 watermelon plants each in both glass house A and B. She introduced pollinators in glass house A only.
(a) What difference will she observe in the number of fruits produced in the two glass houses? Explain with reason.
(b) List 3 changes that will occur in a flower once it gets fertilized.