Smallest bone of human body is _________
Answer: D
The stapes is the smallest bone in the body, about 3 mm long.
It is the innermost of the three ear ossicles - malleus, incus and stapes - which transmit the vibration of the eardrum to the oval window of the cochlea, amplifying it about twentyfold.
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Tissue in which cells have lost the capacity of cell division
Answer: B
Cells that have lost the capacity to divide form permanent tissue.
They arise from meristematic cells that have differentiated and taken on a fixed shape and function - parenchyma, collenchyma, sclerenchyma, xylem and phloem. Only meristems retain the power of division.
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Plants receive their nutrients mainly from ?
Answer: D
Plants take their nutrients mainly from the soil - nitrogen, phosphorus, potassium and the micronutrients, absorbed in solution through the root hairs.
Light supplies energy and chlorophyll captures it, but neither is a nutrient; the carbon comes from the air as carbon dioxide.
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Crop sown at the commencement of the monsoon is called
Answer: C
A crop sown at the onset of the monsoon is a kharif crop.
Kharif crops are sown in June and July and harvested in September and October - rice, maize, jowar, bajra, cotton and jute. Rabi crops are sown in October and November and harvested in spring.
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One of the important consequences of geographical isolation is:
Answer: B
Geographical isolation leads to speciation through reproductive isolation.
Once a barrier divides a population, the two halves accumulate different mutations and experience different selection. Given long enough they diverge so far that they can no longer interbreed even if brought together - allopatric speciation.
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Among the biotic components of the ecosystem, the producer system is ?
Answer: A
The producers in an ecosystem are the green plants.
They alone convert light energy into chemical energy, so all the energy in the food chain enters through them. Animals are consumers and fungi and bacteria decomposers.
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A plant bud is-
Answer: A
A bud is an embryonic shoot - a compressed stem tip with immature leaves or flower parts folded round it, protected by scales.
A terminal bud extends the shoot; axillary buds in the leaf axils give branches.
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The largest gland in the human body is the ________.
Answer: A
Correct answer: Liver
The liver is the body’s largest gland, weighing about 1.5 kg in an adult. It secretes bile as an exocrine gland while also performing hundreds of metabolic and detoxifying functions.
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What is Anthology ?
Answer: C
Anthology, in botany, is the study of flowers and flowering plants, from the Greek anthos.
The literary sense - a collection of poems - comes from the same root, a gathering of flowers.
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Which is responsible for the process of cell division ?
Answer: A
Cell division takes place by mitosis, and by meiosis in the formation of gametes.
Mitosis produces two daughter cells genetically identical to the parent, and is how an organism grows and repairs itself. Meiosis halves the chromosome number and produces four genetically varied cells.
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