NCERT Class X Science Class: Chapter –8. How Do Organisms Reproduce? – Part-5

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Question 24:

In human males, the testes lie in the scrotum, because it helps in the

(a) Process of mating

(b) Formation of sperm

(c) Easy transfer of gametes

(d) All the above

Answer: B

Question 25:

Which among the following is not the function of testes at puberty?

(i) Formation of germ cells

(ii) Secretion of testosterone

(iii) Development of placenta

(iv) Secretion of estrogen

(a) (i) and (ii)

(b) (ii) and (iii)

(c) (iii) and (iv)

(d) (i) and (iv)

Answer: C

Question 26:

The correct sequence of organs in the male reproductive system for transport of sperms is

(a) Testis → Vasdeferens → Urethra

(b) Testis → Ureter → Urethra

(c) Testis → Urethra → Ureter

(d) Testis → Vasdeferens → Ureter

Answer: A

Question 27:

Which among the following diseases is not sexually transmitted?

(a) Syphilis

(b) Hepatitis

(c) HIV - AIDS

(d) Gonorrhea

Answer: B

Short Answer Questions

Question 28:

In a bisexual flower inspire of the young stamens being removed artificially, the flower produces fruit. Provide a suitable explanation for the above situation.

Answer:

The pistil is intact. Cross pollination has occurred leading to fertilization and formation of fruit.

Image the pollination in flower

Image the Pollination in Flower

Image the pollination in flower

Question 29:

Can you consider cell division as a type of reproduction in unicellular organism? Give one reason.

Answer:

Yes, because it results in the formation of two daughter cells, that is, it results in the production of more individuals of the organism.

Image the unicelluar organisms

Image the Unicelluar Organisms

Image the unicelluar organisms

Question 30:

What is a clone? Why do off springs formed by asexual reproduction exhibit remarkable similarity?

Answer:

Clone refers to offspring of an organism formed by asexual method of reproduction. Since they possess exact copies of the DNA of their parent, clones exhibit remarkable similarity.