SSLC (English Medium) Class 9 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

Answer the following by rearranging the jumbled letters :

In this molecule, carbon is attached to four hydrõgen atoms.
emathen.

Answer the following by rearranging the jumbled letters :

Carbon combines with other elements through the _______ bond.
lnaocvet.

Which theory was challenged by the synthetic preparation of Urea?

How many valence electrons are there in carbon?

Why is carbon monoxide harmful to health? (or) What happens when we breathe Carbon monoxide?

Isotopes are atoms with a different number of ______.

The chromophore and autochrome theory was proposed by ______.

What is called Applied Chemistry?

Explain very briefly about various fields of Applied Chemistry.

______ acts as a thermoregulatory organ.

What is homeostasis?

There are ______ essential amino acids required by the human body through the diet.

______ is a trace element required by our body.

World Health Day is celebrated on ______.

In a food pyramid, fat and oil are placed at the bottom.

Analogy:

Jams: ______
______: oil.

Name any two essential amino acids.

______ is the most intensive type of vegetable growing.

India stands first in the world in the production of ______ and ______.

Define the following.

Pomiculture