Heat Transfer in Nature — Science STD 7 — Question

Define combustion.

You were blindfolded and asked to identify the drinks provided in two different glasses. You could identify drink A as lime juice and B as bitter gourd juice. How could you do it inspite of being blindfolded?

State the principle of working of electric generator. What are its important parts?

Seed dispersal helps the plant. Give reasons.

Give an example of a unisexual flower?

What is the age at which reproductive organs are matured?

Boojho got a naughty idea. He wanted to measure the temperature of hot milk using a clinical thermometer. Paheli stopped him from doing so, explain why?

Name the metals which are mixed (alloyed) with iron to make stainless steel.

Arteries have a very thick and elastic walls. Why?

Name some biological contaminants in water.