Elements, Compounds and Mixtures — Science STD 7 — Question

Grasses in the …………. region are very tall.

The frequency of sound is measured in …………….. .

When seen from a great distance, the sky seems to be touching the ground along a circle. This circle is called the …………… .(meridian, horizon)

………………. is used for bathing.

Micro-organisms use food stuffs for their own nutrition and release toxic materials called ………. .

The tip or the apical end of the stem is called a …………….. .

Number of vibrations in a second is called …………….. .

Water does not have a …………… but has definite ………… and ………. .

The scientist …………. was the first to study force and the resulting acceleration.

………………. in the toothpaste helps prevent tooth decay.