PART - 2 CH - 7 How do Organisms Reproduce ? — Science STD 10 — Question

What are plant hormones?

What are the different ways in which individuals with a particular trait may increase in a population?

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.

What is called rancidity? What is the general name of chemicals which are added to fat and oil containing food to prevent the rancidity?

Give an example of a metal which ...
(i) is a liquid at room temperature.
(ii) can be easily cut with a knife.
(iii) is the best conductor of heat.
(iv) is a poor conductor of heat.

Define electric potential and state ItsSI unit.

How will you identify the copper sulphate, iron sulphate and barium sulphate in the laboratory?

Explain the use of alcohol as a fuel.

Distinguish between: Homologous organs and Analogous organs

Why are coils of electric toasters and electric irons made of an alloy nichrome rather than a pure metal?