Question

What is role of seminal vesicles and the prostate gland

Answer 1

these both glands are present near the vas deferans in human male reproductive system.The glands secrete mucous to during the ejaculation due to which semen is formed.Semen is milky liquid which contains about 120 million sperms.
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Answer 2

Seminal Vesicle: Its secretion form a major part of the semen (60%). Its secretion is alkaline in nature which neutralises the effect of acid in the female genital tract. It has fructose sugar which provides nutrition and energy to the sperm.

Prostrate gland: Its secretion form 13-33% of semen. It helps in sperm motility and viability(chances of striking the ovum).