The poison of honey bee is
Answer: C
Bee venom is acidic, with a pH around 5.
Its main component is the peptide melittin. Wasp venom, by contrast, is slightly alkaline - which is the origin of the folk remedy of vinegar for wasp stings and baking soda for bee stings.
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Study of fossils is called
Answer: D
The study of fossils is palaeontology.
It reconstructs the history of life from preserved remains and traces, and supplies the direct evidence for evolution and for the sequence of geological time.
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At which stage of HIV infection does one usually show symptoms of AIDS?
Answer: B
AIDS appears when HIV replicates rapidly in the helper T lymphocytes and destroys them.
The virus can lie latent for years while the CD4 count falls slowly. AIDS is diagnosed when the count drops below 200 per microlitre or an opportunistic infection appears - not on infection itself.
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Lathyrism is caused by excess consumption of.......
Answer: A
Lathyrism is caused by eating too much khesari dal, Lathyrus sativus.
Its neurotoxin, BOAA, damages the motor neurons of the spinal cord and paralyses the legs irreversibly. The pulse is drought-hardy and cheap, so it is eaten most where crops have failed.
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Plant bends towards the source of light on account of the movement of curvature known as
Answer: D
Bending towards light is phototropism.
Auxin accumulates on the shaded side of the shoot tip, so cells there elongate more and the shoot curves towards the light. Geotropism is a response to gravity, thigmotropism to touch and chemotropism to chemicals.
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Which of the following oils is gaining popularity as a cooking option in India?
Answer: B
Coconut oil is the option recorded here as gaining popularity for cooking in India.
Long the staple cooking medium of Kerala and coastal Karnataka, it has regained favour more widely as views on saturated fat have been revised; it is also stable at high temperature because it is highly saturated.
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Agrostology is the study of
Answer: C
Agrostology is the study of grasses, from the Greek agrostis.
It matters far beyond lawns: the grass family includes every cereal - wheat, rice, maize, barley, oats - along with sugarcane and bamboo, and grasses cover about a fifth of the land surface.
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In which of the cerebral lobes is the speech centre located?
Answer: A
The speech centre lies in the frontal lobe.
Broca's area, in the lower frontal lobe of the dominant hemisphere - usually the left - controls the production of speech. Wernicke's area, in the temporal lobe, handles comprehension, and damage to the two gives quite different kinds of aphasia.
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Which of has following group of gases contribute to the 'Green House Effect' ?
Answer: A
Carbon dioxide and methane are the principal greenhouse gases from human activity.
Both are triatomic or polyatomic molecules that absorb infrared radiation. Methane traps far more heat per molecule but is present in much smaller amount and lasts about a decade, while carbon dioxide persists for centuries.
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What is the mode of nutrition of mushroom?
Answer: D
A mushroom is saprophytic.
It has no chlorophyll and cannot photosynthesise, so it secretes enzymes onto dead organic matter and absorbs the digested products. The mushroom itself is only the fruiting body; the feeding mycelium is spread through the substrate.
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