The phenomenon of summer sleep by animals is called
Answer: B
Summer sleep is aestivation, from the Latin aestas, summer.
Animals pass the hot dry season in a dormant state with lowered metabolism - lungfish, snails and some frogs bury themselves until the rains. Hibernation is the winter equivalent.
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The sex of a newborn baby is determined by the chromosome inherited from
Answer: A
The sex of a baby is determined by the chromosome inherited from the father.
The mother is XX and can pass only an X. The father is XY and passes either an X, giving a girl, or a Y, giving a boy. It is the SRY gene on the Y chromosome that starts male development.
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Branch of agriculture concerned with the production of crops
Answer: B
Agronomy is the branch of agriculture concerned with the production of field crops and the management of soil.
It covers crop rotation, irrigation, tillage, weed control and soil fertility. Agrostology is specifically the study of grasses.
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Only male frog produce croacking sound because ____
Answer: A
Only the male frog croaks because the female has no vocal sacs.
The male's pair of sacs on either side of the throat inflate and act as resonators, amplifying the sound made in the larynx. The call attracts females and warns off rival males; the female, having no such need, has no amplifier.
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Name the blood cells in which nucleus is absent
Answer: B
Blood platelets have no nucleus.
They are not whole cells but fragments budded off from the giant megakaryocytes of the bone marrow, so they carry no nucleus and live only about ten days. Mature red cells likewise lose theirs; all the white cells keep them.
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Dicotyledonous weeds are destroyed by a chemical called
Answer: B
Dicotyledonous weeds are killed by 2,4-dichlorophenoxyacetic acid, or 2,4-D.
It is a synthetic auxin that throws the plant's growth into disorder. It is selective because monocots - the cereals - metabolise it quickly, so a cereal field can be sprayed to kill the broadleaved weeds in it.
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Which blood group is known as the universal donor ?
Answer: C
Correct answer: O negative
O negative red cells carry neither A nor B antigens nor the Rh D antigen, so they provoke no reaction in a recipient of any group. AB positive is the converse case, the universal recipient.
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Tikka disease is related with the crop:
Answer: C
Tikka disease affects the groundnut.
It is a leaf spot caused by the fungi Cercospora; dark spots with yellow haloes spread over the leaves, which fall, and the yield drops sharply. It is the most damaging groundnut disease in India.
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Monocarpic plants are those that produce fruit ______ during the life of the plant
Answer: A
Monocarpic plants fruit once in their life and then die.
All annuals and biennials are monocarpic, as are some long-lived plants: bamboo may grow for decades before flowering once and dying. Polycarpic plants, such as most trees, fruit year after year.
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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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