The first sign of the growing human foetus is noticed by

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measuring the tidal volume by spirometer

ultrasound image detecting foetal movements

detecting foetal antibodies in maternal blood

listening to heart sounds through a stethoscope

answer is D.

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Detailed Solution

In human beings, after one month of pregnancy, the embryo’s heart is formed. The first sign of growing foetus may be noticed by listening to the heart sound carefully through the stethoscope.
The human baby starts producing antibodies of its own around 2-3 months of age. Before birth, the baby receives antibodies from the mother through the placenta, which helps to provide temporary immunity to certain diseases.
The first movements of the foetus are usually observed during the fifth month.
Measuring the tidal volume by spirometer is not possible for a growing foetus. The lungs become functional only after birth of the baby.

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