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

Why is dengue also known as break-bone fever?

Name two diseases transmitted by the Aedes aegypti mosquito?

What is known as a reservoir of infection? Give two examples.

Sanjay had an attack of chickenpox and has just recovered. The health officer of his locality says that the disease would not occur again. What would be the reason for this?

Name the different species of protozoa plasmodium.

When Malar, who is suffering from high fever, muscle, and joint pain, undergoes a blood test, it was found that her blood platelet was decreased.

1. What disease is Malar infected with?
2. How is the disease transmitted?
3. How can it be treated?

How is typhoid prevented and treated?

We are advised to take bland and nutritious food when we are sick. What is the reason?

Discuss the strategies to adopt to prevent diseases transmitted through mosquitoes.

Name the causative agent of typhoid in humans. How does the pathogen gain entry into the human body? Write the diagnostic symptoms and mention the organ that is affected in severe cases.

List the applications of sound.

Correct the mistakes:

1.  Washing soda is used for making cakes and bread soft, spongy.
2. Calcium sulphate hemihydrate is used in textile industry for bleaching cloths.

In which stage of mitosis the chromosomes align in an equatorial plate? How?

State whether true or false. If false, correct the statement.

Glomerular filtrate consists of many substances like amino acids, vitamins, hormones, salts, glucose and other essential substances.

Explain the structure of nephron.

Explain the structure of kidney and the steps involved in the formation of urine

Assertion: Urea is excreted out through the kidneys.

Reason: Urea is a toxic substance.

Food and Adulteration Act was enforced by Government of India in the year ______.

What is an adulterant?

What are the effects of consuming adulterated food?