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

What is the chemical nature of biogas. Name an organism which is involved in biogas production?

Draw a diagrammatic sketch of biogas plant, and label its various components given below: Gas Holder, Sludge Chamber, Digester, Dung+water chamber.

Write a short note on Biopiracy highlighting the exploitation of developing countries by the developed countries.

While creating genetically modified organisms, genetic barriers are not respected. How can this be dangerous in the long run?

Why has the Indian Parliament cleared the second amendment of the country’s patents bill?

Give any two reasons why the patent on Basmati should not have gone to an American Company.

What is GEAC and what are its objectives?

For which variety of Indian rice, the patent was filed by a USA Company?

Ignoring our traditional knowledge can we prove costly in the area of biological patenting. Justify.

The process of mineralisation by micro organisms helps in the release of ______.

What is common to earthworm, mushroom, soil mites and dung beetle in an ecosystem?

What could be the reason for the faster rate of decomposition in the tropics?

How do you distinguish between humification and mineralisation?

The rate of decomposition of detritus is affected by the abiotic factors like availability of oxygen, pH of the soil substratum, temperature etc. Discuss.

A farmer harvests his crop and expresses his harvest in three different ways.

1. I have harvested 10 quintals of wheat.
2. I have harvested 10 quintals of wheat today in one acre of land.
3. I have harvested 10 quintals of wheat in one acre of land, 6 months after sowing.

Do the above statements mean one and the same thing. If your answer is yes, give reasons. And if your answer is ‘no’ explain the meaning of each expression.

Match the animals given in column I with their location in column II:

Choose the correct match from the following:

What is common to the following plants: Nepenthes, Psilotum, Rauwolfia and Aconitum?

What could have triggered mass extinctions of species in the past?

What does 'Red' indicate in the IUCN Red list (2004)?

Explain as to how protection of biodiversity hot spots alone can reduce up to 30% of the current rate of species extinction.