Which of the following crops would be preferred for sowing in order to enrich the soil with nitrogen?
Answer: D
Gram would be sown to enrich the soil with nitrogen.
It is a legume, so Rhizobium bacteria in its root nodules fix atmospheric nitrogen into a usable form. Wheat, mustard and sunflower form no such partnership and take nitrogen out of the soil instead.
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An area of dead myocardial tissue is called
Answer: A
An area of dead heart muscle is an infarct.
It results when a coronary artery is blocked and the tissue it supplies is starved of oxygen - a myocardial infarction. The dead muscle is replaced by scar tissue, which does not contract.
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The most healthy edible oil for heart is
Answer: D
Olive oil is regarded as the healthiest edible oil for the heart.
It is high in monounsaturated fat and in polyphenol antioxidants, and low in saturated fat, a combination associated with lower LDL cholesterol. It is the basis of the Mediterranean diet.
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Important component that helps in clotting of the blood is called ____.
Answer: B
Platelets are the component that starts blood clotting.
They clump at the site of injury and release thromboplastin, which converts prothrombin to thrombin; thrombin then turns soluble fibrinogen into the insoluble fibrin mesh that traps blood cells and seals the wound.
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In which Organelle does Cellular Respiration Occur?
Answer: D
Cellular respiration takes place in the mitochondrion.
Glycolysis occurs in the cytoplasm, but the Krebs cycle in the mitochondrial matrix and the electron transport chain on its inner membrane produce almost all the ATP - which is why it is called the powerhouse of the cell.
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Nitrogen Fixation is carried out primarily by
Answer: D
Nitrogen fixation is carried out chiefly by bacteria.
Rhizobium in legume root nodules and free-living forms such as Azotobacter and the cyanobacteria convert atmospheric N2 into ammonia with the enzyme nitrogenase. Lightning and the Haber process fix the rest.
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Study Of Cells Is Called
Answer: B
The study of cells is cell biology, also called cytology.
It covers the structure, function and division of cells, and it became possible only with the microscope - Hooke named the cell in 1665 and Schleiden and Schwann framed the cell theory in 1838–39.
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Which of the following is not a function of proteins?
Answer: D
Proteins do not store and transmit heredity - that is the work of DNA.
They build tissues such as bone, muscle, hair and nail; act as enzymes and hormones; carry oxygen; and form the antibodies that fight disease. Every one of those is a protein function except the storage of genetic information.
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Organisms that live in the deep sea are mainly
Answer: C
Deep-sea organisms are mainly detritivores.
No light reaches them, so nothing photosynthesises there; they live on the rain of dead organic matter sinking from the lit waters above, called marine snow. The exception is the vent communities, which live on chemosynthetic bacteria.
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From the following pairs, find the one which is correctly matched?
Answer: D
Malaria – chloroquine is the correctly matched pair.
The others are wrong: scurvy is treated with vitamin C not thiamine, tuberculosis with antibiotics and prevented by BCG, and tetanus with anti-tetanus serum. The BCG and ATS have been swapped between the two.
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