Which one of the following plant is preferred for mixed cropping in order to enhance the bioavailability of nitrogen?
Answer: B
Gram is grown in mixed cropping to raise the availability of nitrogen.
Being a legume, it carries Rhizobium in root nodules that fix atmospheric nitrogen, some of which becomes available to the companion crop and the rest enriches the soil for the next.
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The outer membrane that covers the brain is
Answer: B
The outermost membrane covering the brain is the dura mater.
The three meninges are the tough fibrous dura outside, the web-like arachnoid beneath it, and the delicate pia mater following every fold of the brain. Cerebrospinal fluid circulates between the last two.
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Ordinary table salt is sodium chloride. What is baking soda?
Answer: D
Baking soda is sodium bicarbonate, NaHCO3.
Heated or acidified it gives off carbon dioxide, which is what raises a cake. Washing soda is the different compound sodium carbonate, and common salt is sodium chloride.
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The water readily available to plants for absorption by roots is
Answer: D
Capillary water is the form readily available to roots.
It is held in the fine pores between soil particles by surface tension, loosely enough for root hairs to draw it out. Gravitational water drains away too fast, and hygroscopic water is held so tightly to the particle surfaces that no root can take it.
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Largest flower found in the world is-
Answer: A
The largest flower in the world is Rafflesia arnoldii, of Sumatra and Borneo.
It reaches a metre across and weighs up to 11 kg. It is a parasite with no leaves, stem or roots of its own, and it smells of decaying flesh to attract the carrion flies that pollinate it.
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The universal donor belongs to blood group
Answer: D
Group O negative is the universal donor.
Its red cells carry neither the A nor the B antigen, so no recipient's antibodies attack them. Group AB is the universal recipient for the converse reason: its plasma has neither anti-A nor anti-B antibody.
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Nitrogenous Food is
Answer: A
Proteins are the nitrogenous foods.
They are built of amino acids, each containing an amino group, so protein is the body's source of nitrogen. Carbohydrates and lipids contain only carbon, hydrogen and oxygen.
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Study of pulse and arterial pressure is called
Answer: B
The study of the pulse and arterial pressure is sphygmology, from the Greek sphygmos, pulse.
The same root gives the sphygmomanometer, the instrument that measures blood pressure with an inflatable cuff.
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The term "antibiotic" was coined by:
Answer: B
Selman Waksman coined the term antibiotic in 1942.
He and his students isolated streptomycin from a soil actinomycete in 1943 - the first effective drug against tuberculosis - and he received the Nobel Prize in 1952. Fleming had discovered penicillin but did not use the word.
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Who invented Polio Vaccine
Answer: D
Jonas E. Salk developed the first effective polio vaccine, announced in 1955.
It used killed virus and was given by injection. Albert Sabin's live oral vaccine followed and, being cheaper and easier to give, became the mainstay of mass campaigns. Salk refused to patent his.
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