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Science · 2026 · 2 marks
CBSE 2026 · Region 3 · Set 1 · Q12
Separation of right side and left side of the heart is useful to keep oxygenated and deoxygenated blood from mixing. Various organisms have different…
Separation of right side and left side of the heart is useful to keep oxygenated and deoxygenated blood from mixing. Various organisms have different types of heart.
(I)
Fill in the blanks (i) to (iii) correctly according to the type of organisms and their evolution in terms of blood circulation :
| Organisms | Number of chambers in heart | Type of blood being circulated | Type of circulation |
| Fish | (i) $\displaystyle \_\_\_\_$ | Mixed | Single |
| (ii) $\displaystyle \_\_\_\_$ | $\displaystyle 3$-chambered | Mixed | Incomplete double circulation |
| Birds and Mammals | $\displaystyle 4$-chambered | Separated circulation path of oxygenated and deoxygenated blood | (iii) $\displaystyle \_\_\_\_$ |
(II)
Which type of circulation is most efficient ?
Marking-scheme solution
I. (i) $\displaystyle 2$-chambered
(ii) Amphibians/Reptiles
(iii) Double circulation
II. Double circulationAll Life Processes questions2026 question paperNCERT solutions: Life ProcessesPractice Life Processes →
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.