Download App

how do organisms reproduce ? — Science STD 10 — Question

Gujarat BoardEnglish MediumSTD 10Sciencehow do organisms reproduce ?4 Marks
Question
Explain how does embryo form and how does child birth occur in female.
✓

Answer

  • The ovary releases ovum which enter in the oviduct (fallopian tube).
  • Fertilisation:
  • The sperms enter through the vaginal passage during sexual intercourse.
  • Sperms travel upwards and reach the oviduct where they may fertilise the egg.
  • Implantation and development:
  • The fertilised egg (zygote) starts dividing and forms a ball of cells or embryo.
  • The uterus prepares itself every month to receive and nurture the growing embryo.
  • The embryo is implanted in the lining of uterus where it continues to grow and completes foetal growth.
  • The lining of uterus thickens and is richly supplied with blood to nourish the growing embryo during pregnancy.
  • Placenta:
  • The embryo gets nutrition from the mother's blood with the help of a special tissue called placenta.
  • It is a disc-like structure which is embedded in the uterine wall.
  • It contains villi on the embryo's side of the tissue.
  • On the mother's side there are blood spaces, which surround the villi.
  • This provides a large surface area for passage of glucose and oxygen from the mother to the embryo.
  • The developing embryo also generates waste substances which can be removed by transferring them into mother's blood through the placenta.
  • Child birth:
  • The development of the foetus inside the mother's body takes approximately nine months.
  • The child is born as a result of rhythmic contractions of the uterine muscles.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[4 marks Questions]" from how do organisms reproduce ?→how do organisms reproduce ? — all question types→Science STD 10 question papers→Gujarat Board STD 10 question papers→Gujarat Board question paper generator→

Similar questions

Draw a neat labelled diagram of the human eye and explain the working of each part of it.
→
Explain covalent bonding in hydrogen molecule $\left( H _2\right)$.
→
Variation is useful for survival of each species. Explain.###How is variation necessary for existence of each species? Explain with example.
→
Distinguish between :
Binary fission and Multiple fission
→
Name different types of chemical reactions; and explain it with suitable example.
→
State causes of myopia. How is this defect corrected? Draw suitable diagram to show it.
→
Write brief explanation about heterotrophic nutrition.###Write a short note: Heterotrophic mode of nutrition
→
What is sex determination? State the different methods of sex determination in animals.
→
Write a short note on: Biogas Plant
→
What are functional groups? Give examples.
→