Hetrospory is first noticed in
(a) gymnosperm
(b) pteridophytes
(c) gymnosperm
(d) ferns
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The countries stand the first and second places in world population are
D) China and India
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The first satellite of USSR is A) Aryabhatta B) Kukai C) Sputnik D) Bhaskara
Correct option is C) Sputnik
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The ideology which became famous in Germany after the First World War.
Correct option is C) Nazism
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The first synthetic carbon compound is …….. and it was prepared by …………
C) Urea, Wohler
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The first member of homologous series among alkynes is ………………..
Correct option is B) Ethyne
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With the decline in the population of fig species it was noticed that the population of wasp species also started to decline.
The relationship between the plant and pollinator is called mutualism. Fig depends on wasp for pollination, and wasp depends on fig for food and shelter With the decline in population of figs,...
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Means of first 10 whole numbers and first 10 natural numbers is in the ratio of
Correct option is (A) 9: 11 Mean of first 10 whole numbers \(=\frac{0+1+2+....+9}{10}\) \(=\frac{9\times10}{20}=\frac92\) Mean of first 10 natural numbers \(=\frac{1+2+3+....+10}{10}\) \(=\frac{10\times11}{20}=\frac{11}2\) \(\therefore\) Their ratio \(=\cfrac{\frac92}{\frac{11}2}\) \(=\frac9{11}\) = 9 : 11
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Match the items of first line with second line. First line : 1. Charles Elton 2. Charles Darwin
(A) 1 – b, 2 – c 3 – a
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If the wave number of the first line in the Balmer series of hydrogen atom is `1500cm^(-1)`, the wave number of the first line of the Balmer series of
Correct Answer - A `bar(v) = bar(v)_(H) xx z^(2)`
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