Science (English Medium) Class 12 - CBSE Important Questions for Biology

Distinguish between the roles of flocs and anaerobic sludge digesters in sewage treatments.

How does the application of the fungal genus, Glomus, to the agricultural farm increase the farm output? 

By taking two examples explain how has bio-fortification helped in improving food quality.

How does the application of cyanobacteria help improve agricultural output?

Name the following:  Any one inter-specific hybrid mammal.

State the cause of ADA deficiency in humans.Mention a possible cure for an ADA deficiency patient.

Name a genus of fungi that forms a mycorrhizal association with plants.

State the difference in organic farmers approach from that of conventional pest control methods.

Expand the Given and mention one application of each:

ELISA

"Man can be a primary as well as a secondary consumer." Justify this statement.

Bottled fruit juices are clearer as compared to those made at home. Explain.

What is gene therapy? Name the first clinical case in which it was used.

Why does Bt toxin not kill the bacterium that produces it, but kill the insect that ingests it?

Name the animals in which methanogens occur and the role they play there.

Give a schematic representation of the transformation of a pro-insulin into insulin.

Write any two biochemical/molecular diagonostic procedures for early detection of viral infection. Explain the principle of any one of them.

Describe the steps that are followed during secondary treatment of sewage.

Explain the interrelationship between organic farming and biofertilizers, with the help of any three suitable examples.

Answer the following question.
What are ‘flocs’, formed during secondary treatment of sewage?

Answer the following question.
Write any two places where methanogens can be found.