Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Biology

Show with the help of a flow chart only, the life cycle of malarial parasite in humans.

Mention the chemical change that proinsulin undergoes, to be able to act as mature insulin

Name two diseases whose spread can be controlled by the eradication of Aedes mosquitoes.

'India has greater ecosystem diversity than Norway." Do you agree with the statement? Give reasons in support of your answer.

Explain the effect on the characteristics of a river when urban sewage is discharged into it.

How has the development of bioreactor helped in biotechnology?

Name the most commonly used bioreactor and describe its working.

Write the difference between genetic biodiversity and species biodiversity that exists at all the levels of biological organisation.

What is joint forest management?

How does a desert plant adapt to the dry, warmer environmental conditions ?

One of the major contributions of biotechnology is to develop pest-resistant varieties of cotton plants. Explain how it has been made possible.

How can sewage be used to generate biogas ? Explain.

Name and explain the technique used for separating DNA fragments and making them available for biotechnology experiments.

Write the scientific name of the organism Alexander Fleming worked on and discovered the first antibiotic.
Was the organism he worked on a fungus or a bacterium ?

Write the specific name of the genus Plasmodium that causes one of the most serious types of diseases in humans. Name the disease.

Describe the events in the life cycle of Plasmodium which take place in the female Anopheles.

Explain what happens in the RBCs of the humans when Plasmodium gains entry into them. How does the human body gets affected?

Rearrange the following from early to late geologic periods:
Carboniferous, Silurian, Jurassic.

Match the microbes listed under Column-A with the products mentioned under Column-B. 

Answer the following question.
Mention the special adaptations evolved in parasites and why?