Biology Quiz with Answers for Competitive Exams

Along the top of each testicle is the epididymis. This is a cordlike structure where the sperm mature and are stored.

Sperm develop in the testicles within a system of tiny tubes called the seminiferous tubules. At birth, these tubules contain simple round cells. During puberty, testosterone and other hormones cause these cells to transform into sperm cells.

Evolution and diversity result from the interactions between organisms and their environments and the consequences of these interactions over long periods of time. Organisms continually adapt to their environments, and the diversity of environments that exists promotes a diversity of organisms adapted to them.

Vas deferens is not a part of the female reproductive system as it is the duct that is meant to carry sperms. It belongs to the male reproductive system. Ovary, Uterus, Fallopian tubes are the parts of the female reproductive system in human beings.

In natural conception, the male sperm fertilizes the female egg inside the woman's body. While many think fertilization occurs in the ovary, it actually takes place in the fallopian tube just outside the ovary.

Infant development begins at birth. Consider major infant development milestones from birth to 3 months — and know what to do when something's not right