Reproductive

At what stage does sexual development begin in humans?

• At birth

• During puberty

• At conception

• During childhood

Which chromosome does the mother's ovum carry?

• X chromosome

• Y chromosome

• Both X and Y chromosomes

• No chromosome

What chromosomes do the father's spermatozoa carry?

• Only X chromosomes

• Only Y chromosomes

• Both X and Y chromosomes

• No chromosomes

If an X-bearing spermatozoon fertilizes the ovum, what is the likely sex of the offspring?

• Male

• Female

• Both male and female

• Cannot be determined

A male offspring results from the fertilization of the ovum by which type of spermatozoon?

• X-bearing spermatozoon

• Y-bearing spermatozoon

• Both X and Y-bearing spermatozoon

• No spermatozoon

Explain how the combination of chromosomes from the parents determines the sex of the offspring.

• The mother’s ovum can carry either an X or Y chromosome, and the father’s sperm always carries an X chromosome.

• The mother’s ovum always carries an X chromosome, and the father’s sperm can carry either an X or a Y chromosome. If an X sperm fertilizes the ovum, the offspring is female; if a Y sperm fertilizes the ovum, the offspring is male.

• Both parents contribute either an X or Y chromosome randomly.

• The sex of the offspring is determined by environmental factors only.

At what age does the onset of puberty usually occur?

• Between ages 5-8

• Between ages 9-12

• Between ages 13-16

• Between ages 17-20

Which of the following best describes sexual maturity?

• The ability to walk independently

• The capability to reproduce

• The completion of primary school

• The ability to speak two languages

What is the main function of puberty in human development?

• To increase height rapidly

• To make reproductive organs completely functional

• To improve memory

• To develop language skills

Which hormones are produced during puberty that are important for sexual maturation?

• Insulin, glucagon, and adrenaline

• Gonadotropin-releasing hormone (GnRH), FSH, and LH

• Thyroxine, cortisol, and melatonin

• Estrogen, testosterone, and progesterone