Here are the answers for Class 10 CBSE — NCERT Science
📖 Chapter: How do organisms reproduce?
✅ Q1.
Asexual reproduction takes place through budding in:
🎯 (b) Yeast
✅ Q2.
Which of the following is not a part of the female reproductive system in human beings?
🎯 (c) Vas deferens
(Vas deferens is part of the male reproductive system.)
✅ Q3.
The anther contains:
🎯 (d) Pollen grains
✅ Q4.
What are the advantages of sexual reproduction over asexual reproduction?
✨ Sexual reproduction produces genetic variation in offspring, which increases adaptability to changing environments.
✨ It improves the chances of survival of the species.
✨ It leads to evolution over time due to variation.
✅ Q5.
What are the functions performed by the testis in human beings?
🧪 Testes produce:
- Sperm cells (male gametes)
- Testosterone hormone, which regulates the development of male secondary sexual characters.
✅ Q6.
Why does menstruation occur?
🌸 If the egg released from the ovary is not fertilized, the thickened lining of the uterus (which was prepared to receive a fertilized egg) breaks down and comes out through the vagina as blood and mucus.
This process is called menstruation.
✅ Q7.
Draw a labelled diagram of the longitudinal section of a flower.
Here is an ASCII-style label to help visualize:
Stigma
|
Style
|
Ovary (with ovules)
|
--------------
| |
Petals Stamens
| |
Sepals Anther (with pollen)
🌼 You should include the main parts:
- Sepals
- Petals
- Stamen (Anther + Filament)
- Pistil/Carpel (Stigma, Style, Ovary, Ovules)
If you want, I can also generate an HTML page with the diagram or a printable image — let me know!
✅ Q8.
What are the different methods of contraception?
🛡️ Methods of contraception include:
- Barrier methods (condoms, diaphragms)
- Oral contraceptive pills
- Intrauterine devices (IUDs)
- Surgical methods (vasectomy in males, tubectomy in females)
✅ Q9.
How are the modes of reproduction different in unicellular and multicellular organisms?
- In unicellular organisms, reproduction is usually asexual, e.g., binary fission in amoeba.
- In multicellular organisms, reproduction is usually sexual, involving gamete formation and fertilization.
✅ Q10.
How does reproduction help in providing stability to populations of species?
🌱 Reproduction ensures the continuity of a species by replacing older, dying individuals with new ones, maintaining the population size and genetic diversity in a stable environment.
✅ Q11.
What could be the reasons for adopting contraceptive methods?
🔷 To prevent unwanted pregnancies.
🔷 To control population growth.
🔷 To maintain a gap between children for the health of mother and child.
🔷 To prevent the transmission of sexually transmitted infections (STIs) in some cases.
If you’d like, I can also:
🌟 Generate this in an attractive HTML page
🌟 With colored cards, diagrams, and easy-to-read layout.
✅ Shall I prepare that?