The blood pressure of normal human is
Answer: B
Normal human blood pressure is about 120/80 mm of mercury.
The first figure is the systolic pressure, when the ventricles contract, and the second the diastolic, between beats. Sustained readings above 140/90 are classed as hypertension.
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What provides instant energy ?
Answer: D
Carbohydrates provide instant energy.
They are digested to glucose, which passes straight into the blood and is used by the cells at once; each gram yields about 4 kilocalories. Fat yields more energy per gram but takes far longer to break down, and protein is used for energy only as a last resort.
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Beri-Beri is caused by the lack of vitamin
Answer: C
Beri-beri is caused by a deficiency of vitamin B1, thiamine.
Thiamine is needed to release energy from carbohydrate; without it the nerves and heart suffer. It was traced in the 1890s to a diet of polished rice, since milling removes the vitamin-rich husk.
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What is common to whale, seal and shark?
Answer: C
Whale, seal and shark share convergent evolution.
A mammal, another mammal and a fish have independently arrived at the same streamlined body, fins and flippers, because the physics of swimming rewards the same shape. Their similarity reflects a shared way of life, not a shared ancestor.
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Phloem is a tissue found in
Answer: B
Phloem is a plant tissue. It carries the sugars made in the leaves to the rest of the plant, in both directions as needed.
Its conducting elements are sieve tubes, living cells whose end walls are perforated, assisted by companion cells. Xylem, the other vascular tissue, carries water upward only.
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In India, cluster bean(Guar) is traditionally used as a vegetable or animal feed, but recently the cultivation of this has assumed significance. Which of the following statements is correct in this co
Answer: B
The gum made from cluster bean seeds is used in the extraction of shale gas.
Guar gum thickens the water pumped into a well during hydraulic fracturing, so it can carry the sand that props the fractures open. The shale boom in the United States sent Indian guar prices up several fold after 2010.
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In cactus, the spines are modified
Answer: C
In a cactus the spines are modified leaves.
Reducing the leaf to a spine cuts the surface from which water can be lost almost to nothing, and the spines also shade the stem and deter grazing animals. Photosynthesis is taken over by the swollen green stem.
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Study of inter relationship between living organism and their environment is called _______
Answer: C
The study of the relationship between organisms and their environment is ecology.
Haeckel coined the word in 1866 from the Greek oikos, household. An ecosystem is one unit of study within ecology, not the study itself.
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Movements due to light are shown by
Answer: A
Movements in response to light are shown by flowering plants.
Phototropism bends the shoot towards light; the sunflower head tracking the sun and the leaves of the prayer plant folding at dusk are other examples. Such movements need the differential growth or turgor changes that the higher plants possess.
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Outer covering of virus made up of protein is
Answer: A
The protein coat of a virus is the capsid.
It is built of repeating subunits called capsomeres, and it protects the nucleic acid and attaches the virus to a host cell. A complete virus particle is a virion; a viroid is a naked infectious RNA with no protein at all.
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