$CATEGORY: Science - Khan Academy/8.How do Organisms Reproduce?/8.How do Organisms Reproduce?--Sexual Reproduction

//Multiple Choice

Which of the following is the primary male reproductive organ? {
    =Testes
    ~Prostate gland
    ~Penis
    ~Seminal vesicle
}

What is the function of the testes? {
    ~To produce urine
    =To produce sperm and testosterone
    ~To store urine
    ~To transport sperm
}

Where are sperms temporarily stored before ejaculation? {
    ~Testes
    =Epididymis
    ~Vas deferens
    ~Urethra
}

What is the role of the seminal vesicles? {
    ~To produce sperm
    =To produce fluid that nourishes sperm
    ~To transport sperm
    ~To store sperm
}

Which hormone regulates the production of sperm in males? {
    ~Estrogen
    ~Progesterone
    =Testosterone
    ~Oxytocin
}

Which structure in the male reproductive system is responsible for transporting sperm from the testes to the urethra? {
    ~Epididymis
    =Vas deferens
    ~Seminal vesicle
    ~Prostate gland
}

What is the function of the prostate gland? {
    ~To produce testosterone
    ~To store sperm
    =To secrete fluid that enhances sperm motility
    ~To transport urine
}

What is the tube through which semen and urine exit the male body? {
    ~Ureter
    =Urethra
    ~Vas deferens
    ~Epididymis
}

Which of the following is not part of the male reproductive system? {
    ~Testes
    =Ovaries
    ~Penis
    ~Vas deferens
}

What is the function of the scrotum? {
    ~To produce sperm
    =To regulate the temperature of the testes
    ~To store sperm
    ~To transport sperm
}

//True or False

The testes are located inside the abdominal cavity in males. {F}

Testosterone is the primary male sex hormone. {T}

The epididymis is the site of sperm production. {F}

The prostate gland secretes fluid that enhances sperm motility. {T}

The scrotum helps regulate the temperature of the testes. {T}

The vas deferens transports both urine and sperm. {F}

The seminal vesicles contribute the majority of the fluid in semen. {T}

Sperm cells contain 46 chromosomes. {F}

The bulbourethral glands secrete a fluid that neutralizes the acidity of the urethra. {T}

The urethra is part of both the male reproductive and excretory systems. {T}

//Fill in the blanks

The male reproductive system produces male gametes called ________. {
    ~Ovum
    =Sperms
    ~Zygotes
    ~None of the above
}

The hormone responsible for the development of male secondary sexual characteristics is ________. {
    ~Estrogen
    ~Progesterone
    =Testosterone
    ~Oxytocin
}

The ________ is the pouch of skin that holds the testes outside the body. {
    =Scrotum
    ~Epididymis
    ~Urethra
    ~Penis
}

The tube that carries sperm from the epididymis to the urethra is called ________. {
    ~Ureter
    =Vas deferens
    ~Seminal vesicle
    ~Fallopian tube
}

The fluid produced by the ________ gland helps in sperm motility. {
    =Prostate
    ~Seminal vesicle
    ~Bulbourethral
    ~None of the above
}

Sperms are produced in the ________ inside the testes. {
    ~Vas deferens
    =Seminiferous tubules
    ~Urethra
    ~Epididymis
}

The ________ vesicles produce a fluid that provides energy to sperm. {
    =Seminal
    ~Prostate
    ~Bulbourethral
    ~Testes
}

The structure that stores sperm temporarily and allows them to mature is the ________. {
    =Epididymis
    ~Urethra
    ~Vas deferens
    ~Scrotum
}

The external male reproductive organ used for copulation is the ________. {
    ~Scrotum
    =Penis
    ~Urethra
    ~Testes
}

The ________ glands secrete a fluid that lubricates the urethra and neutralizes acidity. {
    ~Prostate
    =Bulbourethral
    ~Seminal
    ~Testes
}

//Numericals

What is the average temperature of the scrotum required for sperm production? {
    ~37°C
    =35°C
    ~40°C
    ~30°C
}

On average, how many sperms are produced daily in a healthy male? {
    ~1 million
    ~10 million
    ~50 million
    =100 million
}

What is the approximate length of the epididymis? {
    ~2 cm
    ~6 cm
    =6 meters
    ~10 meters
}

How many chromosomes are present in a human sperm cell? {
    =23
    ~46
    ~22
    ~44
}

What is the pH range of seminal fluid? {
    ~4.0–5.0
    ~5.0–6.0
    =7.2–8.0
    ~8.0–9.0
}

How many sperms are released on average during ejaculation? {
    ~1–5 million
    ~10–50 million
    =100–300 million
    ~500–700 million
}

What is the approximate length of the vas deferens? {
    ~15 cm
    =30 cm
    ~45 cm
    ~60 cm
}

How long does it take for a sperm cell to mature in the epididymis? {
    ~2–3 hours
    ~2–3 days
    =2–3 weeks
    ~2–3 months
}

What percentage of the semen volume is contributed by the seminal vesicles? {
    ~10–20%
    ~30–40%
    =60–70%
    ~80–90%
}

How many sperm cells typically fertilize an egg during reproduction? {
    =1
    ~2
    ~10
    ~100
}

//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Epididymis -> Stores and matures sperm
=Vas deferens -> Transports sperm to the urethra
=Prostate gland -> Secretes fluid that enhances sperm motility
=Testes -> Produces sperm and testosterone
}


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