P-1 Heat — Science STD 10 — Question

What is retina?

Find the correlation: Bird from very cold regions : Penguin : : Aquatic Mammal from very cold regions : ………..

What happens when carbon burns in air? Write the chemical equation of the reaction which takes place.

Complete the following:
Concept-diagram using factors harming the social health and based on it, answer the following questions :
(i) Tobacco products can be included in which of those factors?
(ii) How the tobacco products are harming the social health?

The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka - boron, eka - aluminium and eka-silicon. What names were given to these elements when they were discovered later on?

State the property of the metals due to which they can be beaten into thin sheets.

The elements beryllium, magnesium and calcium are in group 2. What will be their valency?

Write the balanced chemical equations for the following reactions:
Aluminium + Copper chloride → Aluminium chloride + Copper

Give one example of the movement of a plant part which is caused by the loss of water (or migration of water).