Sexualreproduction In Animals | How do Organisms Reproduce? | Assessment | English | Grade 10

Which of the following change is associated with the sexual maturity in boys?

• Entire growth of body

• Development of high pitch voice

• Increase in height

• Cracking of voice

Answer explanation

In boys at puberty, there is the appearance of a beard and mustache on the face and cracking of the voice. Hence cracking of voice is associated with the sexual maturity in boys

Which of the following is the correct sequence of organs of male reproductive system for transport of sperms?

• Vas deferens, testis, urethra

• Testis, vas deferens, ureter

• Testis, vas deferens, urethra

• testis, ureter, urethra

Answer explanation

In human males, testis produces sperm which is transferred into vasdeferns. From vas deferens sperm is taken to urethra. Hence correct sequence is : testis, vas deferens, urethra.

Which of the following statement about the given figure of male reproductive system are correct?

• Label A represents the seminal vesicle

• Label B represents the prostate gland

• Label G represents the testis

• Label E represents the urethra

Answer explanation

In the given figure of male reproductive system: Label A represents the prostate gland. Label B represents the seminal vesicle. Label C represents the vas deferens. Label D represents the penis. Label E represents the urethra. Label F represents the testis and label G represents the scrotum. Hence option 4 is the right answer.

What are the functions of ovaries of females?

• Formation of placenta

• It produces the estrogen

• It produces the testosterone

• Both option 1 and option 2

Answer explanation

In females ovaries produce egg cells and also produce the hormone estrogen.

Where does the fertilisation of egg cell occurs in human being?

• Fallopian tube

• Ovary

• Uterus

• Vagina

Answer explanation

The fusion of male gamete and female gamete is called fertilisation. In human beings, fusion of sperm with the egg cell occurs in the fallopian tube.

Which organ provides the nourishment to the developing foetus?

• Uterus

• Placenta

• Umbilical cord

• Oviduct

Answer explanation

With the help of the umbilical cord, the placenta supplies glucose, oxygen and essential substances to the foetus, similarly it removes carbon dioxide and other excretory products produced by the foetus. So placenta provides nourishment to the developing foetus.

A man has a undescended testicles a condition in which the testes are not descended out from the abdominal cavity. This condition leads to infertility of male because:

• Testerone is not produced

• Nutrients are nor provided to the sperms

• Lower temperature is not provided for the development of sperms

• Higher temperature is not provided for the development of sperms

Answer explanation

In males the scrotum is the paired sac that holds the testes outside the abdominal body. It allows the formation of sperms at lower temperature than the normal body temperature. If the testes are not descended out from abdominal cavity, then lower temperature will be not provided for the development of sperms. This leads to infertility of male.