PART - 1 CH - 3 Metals and Non-Metals — Science STD 10 — Question

How were the positions of cobalt and nickel resolved in the modern periodic table?

Give any two ways in which non-biodegradable substances would affect the environment.

What are called acidic oxides? What are the types of non-metallic oxide? Give examples.

What do you mean by a precipitation reaction? Explain by giving examples.

Why is photosynthesis considered as an endothermic reaction?

Give the scientific reason : Consumers are directly or indirectly dependent on green plants for energy.

State causes of hypermetropia. How can this defect be corrected? Draw suitable diagram to show it.

A woman has undergone surgical contraceptive method. Will she show the menstruation or not? Justify your answer.

Answer in one word for each sentences.
Sentence A : The physical and biological world where living organisms live
Sentence B : The phase of food chain where energy is converted from one form to another.
Sentence C : Physical factors like temperature, rainfall, wind, soil, etc of an ecosystem.
Sentence D : Organisms, which are directly or indirectly dependent on producers for their food.