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

Mention any two examples where the organisms involved are commercially exploited in agriculture.

How is mutualism different from commensalism?

Why are baculoviruses considered good biocontrol agents?

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.

State the importance of using a bioreactor.

Organic farmers prefer the biological control of diseases and pests to the use of chemicals for the same purpose. Justify

Give an example of a bacterium, a fungus and an insect that are used as biocontrol agents.

Prepare a flow chart in formation of recombinant DNA by the action of restriction endonuclease enzyme EcoRI.

Name the two intermediate hosts which the human liver fluke depends on to complete its life cycle, so as to facilitate parasitization of its primary host.

There are many animals that have become extinct in the wild but continue to be maintained in Zoological parks.
(i) What type of biodiversity conservation is observed in this case?
(ii) Explain any other two ways which help in this type of conservation.

Answer the following question.
Mention the term used to describe a population interaction between an orchid growing on a forest tree.

Answer the following question:
Describe the formation of recombinant DNA by the action of EcoRI.

Describe the process of amplification of the “gene of interest” using the PCR technique.

List six advantages of the "ex-situ' approach to conservation of biodiversity.

Answer the following question.
Mention the term used to describe a population interaction between an orchid growing on a forest tree.

How does the activity of each one of the following help in organic farming?
Mycorrhiza

Name and explain the interaction that is seen between clownfish and sea anemones.

Give one example of Interspecific competition.

With the help of a suitable diagram, describe the logistic population growth curve.