Q.Foetus development can be observed by using ________.

Foetal development is monitored using ultrasonography (ultrasonogram), which uses high-frequency sound waves rather than ionising radiation to visualise the foetus safely.

Ultrasonography (USG), commonly called an ultrasound scan or sonogram, works by sending high-frequency sound waves (beyond the range of human hearing) into the body through a transducer; these sound waves reflect differently off tissues of different densities, and a computer converts the returned echoes into a real-time image. Because it uses sound waves and not ionising radiation, it is considered safe for repeated use during pregnancy, and it is the standard technique used by doctors to observe foetal growth, position, heartbeat, and detect abnormalities during development. ECG (electrocardiogram) instead records the electrical activity of the heart and is used to study heart function/rhythm, not foetal imaging. EEG (electroencephalogram) records the electrical activity of the brain, used to study brain function or diagnose conditio …