Weather, Climate and Adaptations of Animals of Climate — Science STD 7 — Question

What happens when magnesium is burnt in air?

What changes did you observe in the appearance of the liquid after aeration?

What is the time period of a simple pendulum?

Find out how many times you breathe in and breathe out in a minute?

What is heartbeat? Name the instrument used to provide information about heartbeat.

Predict the following change can be reversed or not be reversed. If you are not sure, you may write that down. Why are you not sure about these?
Twisting of straight string

The mercury does not fall or rise in a clinical thermometer when taken out of the mouth. Explain why?

What is a canopy?

All the needs of animals living in a forest are fulfilled. Justify this statement in a few sentences.

Two magnetic lines of force don’t intersect each other. Explain why?