Is Matter Around Us Pure? — Science STD 9 — Question

A crop which has been developed by introducing a new gene from any other source to obtain desired characteristics is called a __________ crop. (Hybrid, Genetically Modified, High Yielding)

Lining of the small intestine is made up of ____________. (Columnar epithelium, Squamous epithelium, Cuboidal epithelium)

_________ have guard cells. (Stomata, Phloem, Cortex)

A mixture of kerosene and petrol can be separated by _________.

A heterogeneous mixture of liquid and solid is separated by ________. (Centrifugation, Filtration, Sublimation)

The number of protons in the nucleus of an atom is called its __________. (Atomic number, Mass number, Valency)

In a chemical reaction, the sum of the masses of the reactants and the products remains unchanged. This is called _________.

An atom of an element has 11 protons, 11 electrons, and 12 neutrons. The atomic mass of the atom is __________. (23, 11, 12)