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

The carbon atoms in Graphene are arranged in ______.

Graphite is used as a lubricant in machines because ______.

Hexagonal layers in Graphite are held together by ______.

Graphene is a ______-shaped hexagonal ring.

How can graphite be transformed into a diamond?

Why is graphite softer than a diamond?

The Analgesics are also called ______.

______ produce sleep and unconsciousness.

What is Analgesics? How is it useful?

Which is not a feature of chordates?

The biggest vertebrate animal is the ______.

The notochord extends throughout the entire length of the body is ______.

Animals that possess notochord are called ______.

What is the name of the bone which is filled with air?

______ is the unique characteristic feature of mammals.

In mammals, the testis is enclosed by ______.

______ formed during embryonic development.

Cyclostmes are ______.

Mammals have four-chambered Hearts.

Assertion (A): Mammals give birth to their young ones.
Reason (R): Platypus is an egg-laying mammal.