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• Neha: "Your large intestine will absorb 7. Rohan performed an experiment to confirm
more water." that exhaled air contains carbon dioxide by
Who is most likely correct about the effect of blowing air into limewater. After completing
losing beneficial bacteria? (Decomposition) the activity, he wrote the following conclusion:
(a) Sahil (b) Riya “Limewater remained clear, showing that
exhaled air does not contain carbon dioxide.”
(c) Anil (d) Neha His classmates reviewed his conclusion and
5. In a class activity, students observed a model gave their opinions:
of the small intestine with villi. • Aryan: “Your conclusion is incorrect
because limewater should turn milky.”
• Sana: “Your conclusion is correct; no
change means no carbon dioxide.”
• Varun: Your conclusion is correct;
limewater does not change colour in the
presence of carbon dioxide
• Anita: “Carbon dioxide has no role in this
The teacher asked why villi contain many experiment.”
blood vessels. Students replied: Who correctly identified the mistake in
• Siya: "To digest food faster." Rohan’s conclusion? (Decomposition)
• Aman: "To absorb nutrients and carry
them into the bloodstream." (a) Aryan (b) Sana
• Kanika: "To store food inside them."
• Shivani: "To remove water from food." (c) Varun (d) Anita
Who gave the correct reason? 8. Observe the figure.
(Algorithmic Thinking)
(a) Aman (b) Siya
(c) Kanika (d) Shivani
6. A student wrote:
“Pepsin kills germs and hydrochloric acid
breaks proteins.”
What is the mistake? (Abstract Thinking)
(a) Pepsin should kill germs while HCl
protects the stomach. What real-life concept does this model best
represent? (Pattern Recognition)
(b) Hydrochloric acid has no role in
digestion. (a) Digestion
(c) The functions of pepsin (b) Blood circulation
and hydrochloric acid are
interchanged. (c) Breathing mechanism
(d) Excretion
(d) There is no mistake.
82 Computational Thinking-7 (Science)
