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

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Question 46:

What are the benefits of using mechanical barriers during sexual act?

Answer:

Mechanical barriers like condom prevents the sperms from reaching the egg. Thus it is an effective method to avoid pregnancy. It also prevents transmission of infections during sexual act.

Question 47:

In the given Figure label the parts and mention their functions

(a) Production of egg

(b) Site of fertilization

(c) Site of implantation

(d) Entry of the sperms

Image labled parts and mention their functions(Q)

Image Labled Parts and Mention Their Functions(Q)

Image labled parts and mention their functions(Q)

Answer:

(a) Ovary (production of egg)

(b) Oviduct (site of fertilisation)

(c) Uterus (site of implantation)

(d) Vagina (entry of the sperms)

Image labled parts and mention their functions(A)

Image Labled Parts and Mention Their Functions(A)

Image labled parts and mention their functions(A)

Question 48:

What would be the ratio of chromosome number between an egg and its zygote? How is the sperm genetically different from the egg?

Answer:

The ratio is 1 : 2. Sperms contain either X or Y chromosome whereas an egg will always have an X chromosome.

Long Answer Questions

Question 49:

Why budding, fragmentation and regeneration all are considered as asexual types of reproduction? With neat diagrams explain the process of regeneration in Planaria.

Answer:

Budding, fragmentation and regeneration are considered as asexual types of reproduction because all of them involve only one parent and gametes are not involved in reproduction

Regeneration in Planaria: If the individual body of the planaria are cut or broken up into many pieces, many of these pieces grow into separate individuals.

Image Regeneration in Planaria

Image Regeneration in Planaria

Image Regeneration in Planaria

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