ICSE Class X Biology 2023 Papers

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ICSE Class X Biology 2023 Papers

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SECTION - I

Select the correct answers to the questions from the given options.

Question : 3 of 74

Marks: +1, -0

The heart sound 'Dup' is produced when:

Semilunar valves open
Atrio ventricular valves close
Semilunar valves close
Atrio ventricular valves open

Solution:

Explanation: The 'DUP' sound is produced when at the begining of venticular diastole, the semilunar valves at the roots of aorta and pulmonary artery get closed.

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