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Science · 2023 · 3 marks
CBSE 2023 · Region 4 · Set 1 · Q29
(A) (i) How does Paramecium obtain its food? (ii) List the role of each of the following in our digestive system: (a) Hydrochloric acid (b) Trypsin…
(A)(i)
How does Paramecium obtain its food?
(ii)
List the role of each of the following in our digestive system:
(a)
Hydrochloric acid
(b)
Trypsin
(c)
Muscular walls of stomach
(d)
Salivary amylase
OR
(B)(i)
What is double circulation?
(ii)
Why is the separation of the right side and the left side of the heart useful? How does it help birds and mammals?
Marking-scheme solution
(A) (i) Food enters through a specific spot with the help of movement of cilia.
(a) Creates an acidic medium which facilitates the action of enzyme / kills microorganisms ingested with the food.
(b) Digestion of proteins
(c) Mixing the food thoroughly with digestive juices. / pushes food forward by peristalsis.
(d) Conversion of starch into sugar
(B)
Blood goes through the heart twice during each cycle.
(ii) • To prevent oxygenated and deoxygenated blood from mixing for
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CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.