In plant body, the water and minerals are transported by _______
Answer: D
Water and minerals are transported by the xylem.
Its tracheids and vessels are dead, hollow, lignified cells forming continuous tubes from root to leaf. Water is drawn up by the pull of transpiration, helped by the cohesion between water molecules.
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In flowers pollinated by insects, the pollen grains are
Answer: B
Insect-pollinated flowers have pollen that is rough and sticky, often with spines or a sticky coating, so it clings to a visiting insect.
Wind-pollinated pollen is the opposite: small, smooth, dry and light, produced in enormous quantity so that a little of it reaches a stigma by chance.
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Lungs of a plant are-
Answer: A
The leaves are called the lungs of a plant.
They take in carbon dioxide and give out oxygen through the stomata, and the same pores admit the oxygen the plant needs for its own respiration. Their broad thin form gives the surface area the exchange requires.
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Which one of the following disease is not transmitted by tiger mosquitoes ?
Answer: C
Japanese encephalitis is not spread by tiger mosquitoes.
It is carried by Culex, breeding in rice fields, with pigs and wading birds as reservoirs. The Asian tiger mosquito, Aedes albopictus, transmits dengue, chikungunya and yellow fever.
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At what temperature do pathogenic bacteria grow best in food?
Answer: C
Pathogenic bacteria grow fastest between about 20 and 45°C.
This is the danger zone for food, and it brackets body temperature, 37°C, which is where human pathogens are best adapted to grow. Refrigeration below 5°C slows them and cooking above 70°C kills them.
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Which among the following hormone can be used as a drug to treat cardiac arrest ?
Answer: B
Epinephrine - adrenaline - is used to treat cardiac arrest.
It constricts the peripheral vessels, raising the pressure that drives blood to the heart and brain during compressions, and stimulates the heart itself. It is given intravenously during resuscitation.
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Most common disease of poultry in India is
Answer: C
Ranikhet disease, or Newcastle disease, is the commonest poultry disease in India.
It is a viral infection causing respiratory and nervous symptoms and can kill an entire flock. It is named after the Uttarakhand town where it was first reported in India in 1928, and is controlled by vaccination.
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Which of the following represent maximum number of species among global biodiversity?
Answer: C
Fungi account for the largest number of species among these.
About 100,000 have been described and the true number is estimated in the millions, against perhaps 40,000 algae, 20,000 lichens and 25,000 mosses and ferns. Fungi are second only to insects among all groups of organisms.
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In the study of science
Answer: C
In science either deductive or inductive reasoning, or both, may be used.
Induction generalises from observations into a hypothesis; deduction then draws from that hypothesis a prediction which can be tested. The two work together in the cycle of hypothesis and test.
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One day you wake with a sore throat and a runny nose. Your doctor takes a swab from your throat, sends it to a lab, and telephones you the next day to say that antibiotic will not help you get better.
Answer: D
The antibiotic will not help because you are infected by a virus.
Antibiotics work on structures and processes peculiar to bacteria - the cell wall, bacterial ribosomes, bacterial enzymes. A virus has none of these and replicates inside your own cells, so an antibiotic has nothing to act on. Most sore throats and colds are viral.
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