Life Processes — Science STD 10 — Question

State Dobereiner's law of triad. Give one example of it.

Write any four important facts which must be thought over while considering the scope of disaster.

Read the following extract and answer the questions that follow:
A liberal view behind the concept of organ and body donation is that after death our body should be useful to other needful persons so that their miserable life would become comfortable. Awareness about these concepts is. increasing in our country and people are voluntarily donating their bodies.

Life of many people can be saved by organ and body donation. Blinds can regain their vision. Life of many people can be rendered comfortable by donation of organs like liver, kidneys, heart, heart valves, skin, etc. Similarly, body can be made available for research in medical studies. Many government and social organizations are working towards increasing the awareness about body donation.
1.What is the liberal view behind the organ and body donation?
2.Name any four organs that can be donated.

What is the function of iris and the muscles connected to the lens in human eye?

Draw a circuit diagram to show how a soft iron piece can be transformed into an electromagnet.

What is meant by vinegar and gashol? What are their uses?

Explain why, iron sheets are coated with zinc.

Express escape velocity in terms of G, R and ρ (the earth ’s density)

Express the following facts in the form of a balanced chemical equation:“When a strip of copper metal is placed in a solution of silver nitrate, metallic silver is precipitated and a solution containing copper nitrate is formed”.