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

Why is toothpaste basic?

NaHSO₄ is an acid salt.

What is a resin code? What is the need to display them on plastic articles?

Resin Code” represents the type of ______ used to make the plastic.

Plastic resin codes are shown as three chasing arrows in a ______ with a number in the middle of letters (an acronym of that plastic type).

What are Polymer resins?

Which three resin codes are unsafe?

What are the applications of Radiochemistry?

The radioisotope used for the location of blood clots and circulation disorders is ______.

The isotope used in radiocarbon dating is ______.

Radioisotopes can be easily detected and estimated quantitatively.

What is radioactive decay?

______ is the largest phylum of the animal kingdom.

Malphigian tubules also called as ______.

Assertion (A): The Arthropods have an open circulatory system. 
Reason (R): The cells and tissues are bathed in blood.

Two long bones of the hand are dislocated in a person who met with an accident. Which among the following may be the possible reason? 

The matrix of the bone is rich in ______.

Tendon connects ______.

Elastic structures that connect bones to bones are called ______.

The two types of skeletal connective tissues are ______ and ______.