Structure of the Atom — Science STD 9 — Question

Phylum mollusca can be distinguished from other nonchordates by the presence of:

1. Bilateral symmetry and exoskeleton.
2. A mantle and gills.
3. Shell and non-segmented body.
4. A mantle and a non-segmented body.

The nucleus of an atom is made up of ___________________.

White fibres of connective tissue are made up of:

1. Elastin.
2. Reticular fibre.
3. Collagen.
4. Myosin.

Genetic material of a eukaryotic cell is contained in:

The ion of an element has 3 positive charges. The mass number of atom of this element is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

The number of electrons in an ion Y²⁺ is 10. The atomic number of element Y is most likely to be:

When both crops and livestock are raised on the same farm, it is known as:

Which is the most effective method of separating mixtures of miscible volatile liquids?

......... is said to be done only when the force applied on a body makes the body to move:

Stomata are enclosed by: