Science (English Medium) Class 12 - CBSE Question Bank Solutions for Biology

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.

Define community.

Define mutualism.

Define the following term:

Parasitism

Following statements are given regarding MTP. Choose the correct options given below:

1. MTPs are generally advised during first trimester
2. MTPs are used as a contraceptive method
3. MTPs are always surgical
4. MTPs require the assistance of qualified medical personnel

In which year, MTP was legalised in India?

MTPs are considered relatively safe during the ______ weeks of pregnancy.

What is the expansion for MTP?