HSC Science इयत्ता १२ - Tamil Nadu Board of Secondary Education Question Bank Solutions

Observe the following statements and pick out the right option from the following:

Statement I – Perfumes are manufactured from essential oils.

Statement II – Essential oils are formed in different parts of the plants.

Which one of the following matches is correct?

The only cereal that has originated and domesticated from the New World.

Write the cosmetic uses of Aloe.

What is pseudo cereal? Give an example.

Which is called the “King of Bitters”? Mention their medicinal importance.

What are millets? What are its types? Give example for each type.

If a person drinks a cup of coffee daily it will help him for his health. Is this correct? If it is correct, list out the benefits.

Write the uses of nuts you have studied.

Give an account of the role of Jasminum and Rosa in perfuming.

Write the economic importance of rice.

The first life on earth originated ____________.

List out the major gases that seem to be found in the primitive earth.

A 30 year old woman has bleedy diarrhoea for the past 14 hours, which one of the following organisms is likely to cause this illness?

Exo-erythrocytic schizogony of Plasmodium takes place in ____________.

The sporozoites of Plasmodium vivax are formed from ________.

The Athlete’s foot disease in human is caused by ____________.

The sporozoite of the malarial parasite is present in _______.

Where do the following events in the life cycle of Plasmodium takes place?

a) Fertilization - _________

b) Development of gametocytes - __________ 

c) Release of sporozoites - ________

d) Schizogony - _________

List the causative agent, mode of transmission and symptoms for Diphtheria and Typhoid.