Motion and Time — Science STD 7 — Question

How does smoking affect our health?

Name the instrument used to measure rainfall.

Why is the apparent size of the Moon and the Sun similar in our sky?

Define combustion.

Why caterpillars should not be collected with bare hands?

Wind pollinated flowers produce large number of pollen grains. Give reasons.

Explain how painting of an iron articles prevents it from rusting.

Algae are green in colour. Why?

When the opaque object was a shiny object like a polished steel plate, I got a shadow on the screen, but I also saw that there was a bright spot of light on the wall on the opposite side. Why was it so?

Find the odd one out in the following:
Gamete, budding, fragmentation, regeneration.