Which of the following is/are used as bio fertilizers ? I. Azolla II. Blue green algae III. Alfalfa.Select the correct answer using the codes given below.
I and II
I and III
I, II and III
If a gas is compressed to half of its original volume at 27°C, to what temperature should it be heated to make it occupy its original volume?
If safe storage is to be ensured, the moisture content of food grains at the time of harvesting should not be higher than
colour films used by biologists to photograph living organisms
photomicrographs of microorganisms from various habitats
accumulations of microorganisms at surfaces such as those of a rock, a tooth or an oil droplet
photographic films made through fermentation processes of certain industrial microorganisms
Scratching eases itching because
it removes the outer dust in the skin
it kills the germs
it stimulates certain nerves which direct the brain to increase the production of antihistaminic chemicals
it suppresses the production of enzymes which cause itching
If a mouse of over eight times its normal size has been produced by introducing human growth hormone gene, the technique involved is called
The solar eclipse achieves totality only in the limited geographical regions because
the earth is not a smooth flat surface, but has elevations and depressions
the size of the shadow of the moon on the earth is small
compared to the cross section of the earth
the trajectories of the earth around the sun and the moon around the earth are not perfect circles
sun rays can reach most of the peripheral regions of the shadow of the moon due to a atmospheric refraction
Which of the following strongly threatens biodiversity ?
Fragile ecosystems such as mangroves and wetlands
Inaccessible habitats in Himalayas
Destruction of natural habitats and vegetation and shifting cultivation
Creation of biosphere reserves
Which one of the following is correctly matched?
Dr. Kurien : Space Science
Dr. Malcom Adiseshiah : Cooperative Movement
Dr. Abdul Kalam : Development Economics
Dr. Pramod Karan Sethi : Jaipur Foot
Which one of the following is an element?
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