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About which day in a normal human menstr...

About which day in a normal human menstrual cycle does rapid secretion of LH (popularly called LH surge) normally occurs?

A

14 th day

B

20 th day

C

5 th day

D

11 th day

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The correct Answer is:
A
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Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are conformational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C – H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conformation that is almost completely free of strain. The most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. Which among the following conformation of cyclohexane is the most stable form ?

Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are conformational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C – H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conformation that is almost completely free of strain. The most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. Dihedral angle in staggered (gauche) and eclipsed conformation are:

Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are conformational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C – H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conformation that is almost completely free of strain. The most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. Dihedral angle between two methyl groups of n-butane in the gauche and anti forms are :

The amount of oxygen used by the suitable microorganisms present in water during five days at 20^(@)C is called as BOD. For pure water BOD is about 1 ppm fairly pure water 3 ppm and doubtful purity 5 ppm the municipal sewage has BOD values 100-4000 ppm. BOD= Number of moles of O_2 required / Number of liters of water sample BOD is normally cxpressed for a time period of

Fill in the blanks in the following statements: The human male ejaculates about ____ million sperms during a coitus of which, for normal fertility, at least ____ percent sperms must have normal shape and size and at least ____ percent of them must show vigorous motility.

AAKASH SERIES-HUMAN REPRODUCTION-EXERCISE-III
  1. Identify parts A-D in human female reproduction system

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  2. What happens during fertilization in human after many sperms reach clo...

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  3. About which day in a normal human menstrual cycle does rapid secretion...

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  4. Sertoli cells are found in

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  5. Vasa efferentia are the ductules leading from

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  6. Seminal plasma in human males is rich in

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  7. The first movements of the foetus and appearance of hair on its head a...

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  8. The second maturation division of the mammalian ovum occurs

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  9. Which one of the following statements about human sperm is correct ?

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  10. Which one of the following statements about morula in human is correct...

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  11. The part of Fallopian tube closest to the ovary is

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  12. Signals from fully developed foetus and placenta ultimately lead to pa...

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  13. In human female the blastocyst

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  14. secretions from which one of the following are rich in fructose, calci...

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  15. Seminal plasma in humans is rich in

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  16. Which one of the following is the correct matching of the events occur...

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  17. In the figure of mammalian spermatozoan, identify the different parts ...

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  18. Foctal ejection reflex in human female is induced by

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  19. The correct sequence of spermatogenetic stages leading to the formatio...

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  20. Which one of the following is the most likely root cause why menstruat...

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