Reproduction How Life Continues — Class 9 Science NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 9 Science chapter "Reproduction How Life Continues" — 8 important questions with detailed answers for CBSE board exam preparation.
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TL;DR: Free step-by-step NCERT solutions for Class 9 Science chapter "Reproduction How Life Continues" — 8 important questions with detailed answers for CBSE…
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Key Questions Covered:
- What is reproduction? Distinguish between asexual and sexual reproduction.
- Explain binary fission with example.
- Explain budding and regeneration as asexual reproduction.
- Define vegetative propagation and give four examples.
- Explain sexual reproduction and its advantages over asexual reproduction.
- Explain the concept of regeneration in Hydra.
- + 2 more questions in the full chapter
Solutions Summary:
| Question | Status |
|---|---|
| What is reproduction? Distinguish between asexual and sex… | ✓ Solved |
| Explain binary fission with example. | ✓ Solved |
| Explain budding and regeneration as asexual reproduction. | ✓ Solved |
| Define vegetative propagation and give four examples. | ✓ Solved |
| Explain sexual reproduction and its advantages over asexu… | ✓ Solved |
| Explain the concept of regeneration in Hydra. | ✓ Solved |
Showing 6 of 8 questions
Q1: What is reproduction? Distinguish between asexual and sexual reproduction.
Reproduction = Process by which organisms produce offspring and ensure continuation of species.
Asexual reproduction:
• Only one parent involved
• Offspring genetically identical to parent (clones)
• No fusion of gametes
• Examples: Fission, budding, fragmentation, regeneration, vegetative propagation
Sexual reproduction:
• Two parents (male and female) involved
• Offspring genetically different from parents (genetic variation)
• Fusion of male and female gametes (fertilization)
• Produces genet...
Q2: Explain binary fission with example.
Binary fission = Asexual reproduction where organism divides into two identical daughter cells.
Process: (1) DNA replicates
(2) Replicated chromosomes move to opposite poles
(3) Cell divides into two daughter cells
(4) Each daughter cell contains identical DNA (clones)
Characteristics: (1) No mitotic spindle formation
(2) No membrane-bound nucleus involved
(3) Rapid process, no fusion of gametes
Examples:
• Bacteria (E. coli)
• Amoeba (protozoan)
• Some algae
Q3: Explain budding and regeneration as asexual reproduction.
Budding = Small outgrowth (bud) develops on parent organism; bud detaches and becomes new individual.
Process: (1) Small bud forms on parent body
(2) Bud grows and develops
(3) Bud detaches from parent
(4) New organism grows from bud (genetically identical to parent)
Examples: Hydra, Yeast
Regeneration = Ability to regrow lost body parts; used by some organisms for reproduction (asexual).
Process: (1) Organism loses body part
(2) Remaining part grows back missing portion
(3) May produce new indi...
Q4: Define vegetative propagation and give four examples.
Vegetative propagation = Asexual reproduction in plants using vegetative parts (stem, leaf, root) not seeds.
No gamete fusion; offspring genetically identical to parent (clones).
Examples:
(1) Fragmentation: Strawberry produces runners that detach and grow (rhizopus fungus)
(2) Bulbs: Garlic, onion bulbs separate and grow independently
(3) Tubers: Potato, yam pieces with buds grow new plants
(4) Layering: Stem bends, touches soil, roots form, detaches as new plant
Other examples: Leaf cuttings (...
Q5: Explain sexual reproduction and its advantages over asexual reproduction.
Sexual reproduction = Reproduction involving fusion of male (sperm) and female (egg) gametes.
Process: (1) Male and female gametes produced (meiosis)
(2) Gamete fusion (fertilization)
(3) Diploid zygote forms
(4) Development into new organism
Advantages:
(1) Genetic variation in offspring (different traits) → Adaptation to environment
(2) Healthy population with diverse traits
(3) Mutation and recombination create new allele combinations
(4) Survival advantage in changing environment
(5) Increas...
Q6: Explain the concept of regeneration in Hydra.
Hydra = Freshwater cnidarian with high regeneration ability.
Regeneration process:
(1) If Hydra is cut into pieces, each piece regenerates missing parts
(2) Cells at cut end dedifferentiate and form blastema (mass of undifferentiated cells)
(3) Blastema cells redifferentiate to form required body parts
(4) Each piece grows into complete new Hydra
Example: If Hydra is cut horizontally:
• Anterior piece regenerates tentacles and mouth
• Posterior piece regenerates foot for attachment
Asexual repro...
Showing 6 of 8 questions. Visit the full page for complete solutions.
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