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Which kind of life cycle pattern is show...

Which kind of life cycle pattern is shown by all seed-brearing plants?

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An electromagnetic wave can be represented by E = A sin (kx- omega t + phi) , where E is electric field associated with wave, According this equation, for any value of x, E remains sinusoidal for -oolt t lt oo . Obviously this corresponds to an idealised situation because radiation from ordinary sources consists of finite size wavetrains. In general, electric field remains sinusoidal only for times of order tau_(c) ' which is called coherence time. In simpler language it means that for times of order tau_(c)' a wave will have a definite phase. The finite value of coherence time could be due to many factors, for example if radiating atom undergoes collision with another atom then wave train undergoes an abrupt phase change or due to the fact that an atom responsible for emitting radiation has a finite life time in the energy level from which it drops to lower energy level, while radiating. Concept of coherence time can be easily understood using young's double slit experiment. Let interference patten is observed around point P at time t , due to superposition of waves emanting from S_(1) and S_(2) at times t =(r_(1))/(c) and (r_(2))/(c) respectively, where r_(1) and r_(2) are the distances S_(1) P & S_(2)P . Obviously if (r_(2)-r_(1))/(c) lt lt tau_(e),{"where" " "c = 3xx10^(8)m//s} then, wavetrain arriving at point P from S_(1) & S_(2) will have a definite phase relationship and an interference pattern of good contranst will be obtained. If coherence time is of order 10^(-10) second and screen is placed at a very large distance from slits in the given figure, then:-

An electromagnetic wave can be represented by E = A sin (kx- omega t + phi) , where E is electric field associated with wave, According this equation, for any value of x, E remains sinusoidal for -oolt t lt oo . Obviously this corresponds to an idealised situation because radiation from ordinary sources consists of finite size wavetrains. In general, electric field remains sinusoidal only for times of order tau_(c) ' which is called coherence time. In simpler language it means that for times of order tau_(c)' a wave will have a definite phase. The finite value of coherence time could be due to many factors, for example if radiating atom undergoes collision with another atom then wave train undergoes an abrupt phase change or due to the fact that an atom responsible for emitting radiation has a finite life time in the energy level from which it drops to lower energy level, while radiating. Concept of coherence time can be easily understood using young's double slit experiment. Let interference patten is observed around point P at time t , due to superposition of waves emanting from S_(1) and S_(2) at times t =(r_(1))/(c) and (r_(2))/(c) respectively, where r_(1) and r_(2) are the distances S_(1) P & S_(2)P . Obviously if (r_(2)-r_(1))/(c) lt lt tau_(e),{"where" " "c = 3xx10^(8)m//s} then, wavetrain arriving at point P from S_(1) & S_(2) will have a definite phase relationship and an interference pattern of good contranst will be obtained. If coherence time is of order 10^(-10) second and screen is placed at a very large distance from slits in the given figure, then:-

In bryophytes, the dominant phase in the life cycle is the ____ plant body but in pteridophytes, the main plant body is_____.

The life cycle of any sexually reproducting plant, there is an alternation of generation between (A)____ producing by haploid gametophyte and (B)____ producing by diplod Sporophyte.

Vegetative propagation is seen in which plants ? Flowering or non-flowering plant ? Artificial vegetative propagation is practised in which plants? Seed bearing or seedless plants ?

ALLEN -DIVERSITY OF THE LIVING WORLD-Exercise
  1. In bryophytes, zygotes do not undergo reductino division immediately. ...

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  2. Find the ploidy level of followings with respect to bryophytes:- A-G...

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  3. In bryophytes, the dominant phase in the life cycle is the plant body...

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  4. Which part of gametophytic plant body of mass bears sex organs-antheri...

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  5. Identify the following figures (A,B):-

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  6. How many of the following have heterosporous nature? Selaginalla, Eq...

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  7. Read the following informations and identify the genus * Coralloids ...

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  8. The spread of living pteridophytes is limited and restricted to narrow...

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  9. Female cone to Mega sporophylls to Megasporongia to Megaspores For a...

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  10. Identify the name of processes (A&B) in the given sequence Microspor...

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  11. In gymnosperms, the male and the female gametophytes do not have an in...

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  12. Write the names of male and female sex organs of angiosperms respectiv...

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  13. In how many classes angiosperms are divided?

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  14. Ovules, stamen, ovary, carpel, anther, antipodals, synergids, Pollen g...

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  15. Angiosperms range in size from tiny, almost microscopic e.g. (A) to ta...

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  16. How many nuclei are involved in double fertilization?

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  17. Which kind of life cycle pattern is shown by all seed-brearing plants?

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  18. The life cycle of any sexually reproducting plant, there is an alterna...

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  19. In bryophytes, the dominant phase in the life cycle is the plant body...

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  20. Algae usually reproduce vegetatively by (A) asexually by formation of ...

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