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A single ejaculation contains $...A...$ to$...B..$. million spermatozoa. Semen has pH of $...C...$ to $...D....$ Its alkalinity helps to neutralize the acidity of urethra. Here $A,B, C$ and $D$ refers to
$\mathrm{A}-300, \mathrm{~B}-400, \mathrm{C}-8, \mathrm{D}-9$
$\mathrm{A}-200, \mathrm{~B}-300, \mathrm{C}-7.35, \mathrm{D}-7.50$
$\mathrm{A}-100, \mathrm{~B}-200, \mathrm{C}-5, \mathrm{D}-6$
$\mathrm{A}-150, \mathrm{~B}-200, \mathrm{C}-7, \mathrm{D}-8$
Solution
Semen is collection of secretions from the seminal vesicles, prostate gland and Cowper's glands and sperms from testis. A single ejaculation may contain $200-300$ million spermatozoa (sperms) of which atleast $60 \%$ sperms must have normal shape and size and atleast $40\; \%$ of them must show vigorous motility for normal fertility. Semen has a pH of $7.35-7.50$; its alkalinity helps to neutralize the acidity of the urethra protects the sperms from the acidity of the vagina
