Carbon and its Compounds — Science STD 10 — Question

Name the two main organs of our central nervous system. Which one of them plays a major role in sending command to muscles to act without involving thinking process Name the phenomenon involved.

You being an environmentalist are interested in contributing towards the conservation of natural resources. List four activities that you can do on your own.

Explain why carbon generally forms compounds by covalent bonds.

Which cartilage of larynx forms “Adam’s apple” in man?

If the object is moved further away from the mirror, what changes are there in the position and size of the image?

If current flows through two lamps arranged: (a) in series, (b) in parallel, and the filament of one lamps breaks, what happens to the other lamp ? Explain your answer.

Catenation is the ability of an atom to form bonds with other atoms of the same element. It is exhibited by both carbon and silicon. Compare the ability of catenation of the two elements. Give reasons.

In what ways is fertilisation in a plant:

1. Similar to fertilisation in a human?
2. Different from fertilisation in a human?

State the various characteristics of chemical reactions.