✓ Board-verified
Science · 2024 · 3 marks
CBSE 2024 · Region 2 · Set 1 · Q30
Explain the events that take place once a sperm reaches the oviduct till it becomes a foetus. Write the role of placenta in pregnancy.
Marking-scheme solution
In the oviduct, sperm encounters the egg and fertilisation takes place.
The fertilized egg (zygote) starts dividing and forms a ball of cells or
embryo.Embryo is implanted in the lining of the uterus, where it continues to grow and develops organs to become a foetus.
Role of Placenta:
(i) Provides a large surface area for glucose and oxygen to pass from the mother to the embryo.
(ii) Waste generated by the embryo will be removed by transferring them into the mother's blood.
More from How do Organisms Reproduce?
- (i) Where are testes located in the human males and why? State two function of the testes. (ii) In the human…2023 · asked 3×
- A zygote is formed by the fusion of a male gamete and a female gamete. The number of chromosomes in the…2024 · asked 3×
- When a human egg is fertilized by a sperm having 'Y' chromosome, the zygote has the following combination of…2026 · asked 3×
- Pollination is an important process in sexual reproduction of plants. It is an essential process that…2024 · asked 3×
- Attempt either or: Observe the given diagram and answer the questions that follow: (i) Give the name of the…2026 · asked 3×
- Plants which bear unisexual flowers are:2023 · asked 3×
- Given below are certain situations. Analyse each and describe its possible impact: (i) A population of…2026 · asked 3×
- Spirogyra, despite being a multi-cellular organism, still shows a simple reproductive method. Select the…2026 · asked 3×
CBSE Class 10 Science past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.