Improvement in Food Resources — Science STD 9 — Question

What is goblet cell?

What is meant by saying that ‘the atomic mass of oxygen is 16’?

What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances?

The correct order of the parts of nerve cells through which the nerve impulse is transmitted is:

1. Nerve endings, dendrites, nerve endings.
2. Cell body, acon, dendrites, nerve endings.
3. Dendrites, nerve endings, cell body, acon.
4. Dendrites, cell body, axon, nerve endings.

Is it possible for the atom of an element to have one electron, one proton and no neutron. If so, name the element.

Name the process by which the various ‘dyes’ (coloured materials) present in black ink can be separated.

What name is given to the number 6.022 × 10²³?

A body goes round the sun with constant speed in a circular orbit. Is the motion uniform or accelerated?

Name the central part of an atom where protons and neutrons are held together.

Name the class in which:

1. Digits end up in nail and claws.
2. Hair are present as exoskeleton.