Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions

Name and explain the type of interaction that exists in mycorrhizae and between cattle egret and cattle.

What is mutualism?

List any four techniques where the principle of ex-situ conservation of biodiversity has been employed.

State the medicinal value and the bioactive molecules produced by Streptococcus, Monascus and Trichoderma.

Apart from being a part of the food chain, predators play other important roles. Mention any two such roles supported by examples.

Name two commonly used bioreactors.

Name the bioactive molecules produced by Trichoderma polysporum and Monascus purpureus.

Explain mutualism with the help of any two examples.

Write what do phytophagous insects feed on.

Why do clown fish and sea anemone pair up? What is this relationship called?

How do mycorrhizae act as biofertilizers? Explain.

Suggest and describe a technique to obtain multiple copies of a gene of interest in vitro.

Given below is a list of six micro-organisms. State their usefulness to humans.

1. Nucleopolyhedrovirus
2. Saccharomyces cerevisiae
3. Monascus purpureus
4. Trichoderma polysporum
5. Penicillium notatum
6. Propionibacterium sharmanii

Why should we conserve biodiversity ? How can we do it?

Mention one advantage and one disadvantage to a farmer who uses them.

Draw a labelled sketch of sparged-stirred-tank bioreactor. Write its application.

State Gause’s Competitive Exclusion Principle.

Name the type of association that the genus Glomus exhibits with higher plants.

Explain the significant role of the genus Nucleopolyhedrovirus in an ecological sensitive area.

Describe the mutual relationship between fig tree and wasp and comment on the phenomenon that operates in their relationship.