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de Vries gave his mutation theory on org...

de Vries gave his mutation theory on organic cvolution while working on

A

Oenothera lamarckiana

B

Drosophila melanogaster

C

Pisum sativum

D

Althaea rosea

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Bohr proposed his atomic model based on Planck.s quantum theory and derived following relations for one electron system in C.G.S. units : For H -atom : r_(n) = n^(2) xx r_(1), E_(n) = E_(1) xx Z^(2), u_(n) = (u_(1))/(n), u_(1) = 2.19 xx 10^(8) cm//sec., E_(1) = -13.6eV For 1 electron system, other than H r_(n) = (n^(2) xx r_(1H))/(Z), E_(N) = (E_(1H) xx Z^(2))/(n^(2)), u_(n) = (u_(1H) xx Z)/(n) . Later on de Broglie proposed the dual nature of electron and put forward his wave concept. The wave length of electron in an orbit was given lambda = h/mu The potential energy of electron in 3^(rd) Bohr orbit of H-atom is :

Bohr proposed his atomic model based on Planck.s quantum theory and derived following relations for one electron system in C.G.S. units : For H -atom : r_(n) = n^(2) xx r_(1), E_(n) = E_(1) xx Z^(2), u_(n) = (u_(1))/(n), u_(1) = 2.19 xx 10^(8) cm//sec., E_(1) = -13.6eV For 1 electron system, other than H r_(n) = (n^(2) xx r_(1H))/(Z), E_(N) = (E_(1H) xx Z^(2))/(n^(2)), u_(n) = (u_(1H) xx Z)/(n) . Later on de Broglie proposed the dual nature of electron and put forward his wave concept. The wave length of electron in an orbit was given lambda = h/mu The circumference (in m) of 3^(rd) Bohr orbit in H-atom is :

Just as Bohr.s model of atom was developed on the basis of planck.s quantum theory, wave mechanical model of atom has been developed on the basis of quantum mechanics. The herat of quantum mechanism is Schrodinger wave equation which in turn is based on Heisenberg.s uncetainity principle and de broglie concept of dual nature of matter and radiation. Bohr model could explain the main lines of hydrogen or hydrogenic spectra but could not explain their fine structure. To explain this, it was suggested that each level consists of a number of sublevels, it was suggested that each level consists of a number of sublevels, the transitions between which gave rise to closely spaced lines. The numbers representing the main energy level are called Princiapl Quantum Number (n) while those representing sublevels are called Azimuthal Quantum numbers (l) and these determine the angular momentum of the electron. The orbital angular Number (m) which is just like a further split of a sublevel into finer sublevels. Lastly the electron may rotate or spin about its own axis given rise to Spin Quantum number (s) which determines the angular momentum of the electron. The de Broglie wavelength (lambda) of the electron subjected to an accelerating potential of V volts is given by

AAKASH SERIES-EVOLUTION-EXERCISE - I (BIOLOGICAL EVOLUTION ( THEORIES OF EVOLUTION & MECHANISM OF EVOLUTION))
  1. New species arise by sudden jump according to

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  2. There are no intermediate stages in the course of evolution according ...

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  3. According to Darwin, if new variations are to be inherited they should...

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  4. de Vries gave his mutation theory on organic cvolution while working o...

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  5. The most likely reason for the developoment of resistance against pe...

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  6. Which one of the following scientist's name is correctly matched with ...

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  7. Which of the following evidences does not favour the Lmarckian concept...

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  8. The diversity in the ty of veaks of finches adapted to differenn feedi...

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  9. Drawinism explains all the following except

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  10. Given below are four statements (A-D) each with one or two blanks. Sel...

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  11. Single step large mutation leading to speciation is also called

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  12. By the statement 'survival of the fittest', Darwin meant that

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  13. Which of the following are the two key concepts of Darwinian theory of...

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  14. According to Lamrckicm, long necked giraffes evolved because

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  15. Each of us is part of the ongoing evolution of the species. Which of t...

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  16. Which of the following statements about natural selection are correct?...

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  17. Replacement of the lighter-coloured variety of peppered moth (Biston b...

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  18. Appearance of antibiotic-sistant bacteria is an example of

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  19. Which of the following is an example for link species?

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  20. Variations during mutations of meiotic recombinations are

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