Reproduction in Animals — Science STD 8 — Question

What is an alloy?

Name the group of microorganisms which can photosynthesise.

Which produces sound of a higher pitch: a drum or a whistle?

Two tiny holes are made in a plastic bucket, one near the middle part and the other just above bottom when this bucket is filled with water, the water rushes out from the bottom hole much faster than from the upper hole. What conclusion do you get from this observation?

Name the star (after the Sun) which is closest to the Earth.

Can air, water and soil be exhausted by human activities ?

Why is Earth called the Blue Planet?

Which metal is less reactive: copper or iron?

Name the first fully synthetic fibre.

Give another term for a fertilized egg.