Class 12 Biology - Chapter 1: Reproduction in
Organisms Important Questions & Answers
Q1. What is reproduction? Why is it important?
Reproduction is the biological process by which organisms produce new individuals of the same
species. It is important because it ensures continuity of species, maintains population, and helps in
evolution.
Q2. Explain types of reproduction.
There are two main types: 1. Asexual reproduction: Single parent, no gamete formation, offspring
identical. 2. Sexual reproduction: Two parents, involves fusion of gametes, leads to variation.
Q3. What is asexual reproduction? Give examples.
Asexual reproduction involves only one parent. Offspring are genetically identical. Examples: Binary
fission (Amoeba), Budding (Yeast), Fragmentation (Spirogyra).
Q4. What is sexual reproduction?
Sexual reproduction involves formation and fusion of male and female gametes resulting in zygote
formation. It leads to genetic variation.
Q5. Explain events in sexual reproduction.
1. Pre-fertilization: Gamete formation and transfer. 2. Fertilization: Fusion of gametes. 3.
Post-fertilization: Zygote formation and development.
Q6. What is vegetative propagation?
It is a type of asexual reproduction in plants where new plants grow from vegetative parts like root,
stem, or leaves.
Q7. What are clones?
Clones are organisms that are genetically identical to each other and produced through asexual
reproduction.
Q8. Difference between asexual and sexual reproduction.
Asexual: One parent, no variation. Sexual: Two parents, variation present.
Q9. What is lifespan?
, Lifespan is the period from birth to natural death of an organism. It varies from species to species.
Q10. Why is variation important?
Variation helps organisms adapt to changing environment and plays a key role in evolution.
Organisms Important Questions & Answers
Q1. What is reproduction? Why is it important?
Reproduction is the biological process by which organisms produce new individuals of the same
species. It is important because it ensures continuity of species, maintains population, and helps in
evolution.
Q2. Explain types of reproduction.
There are two main types: 1. Asexual reproduction: Single parent, no gamete formation, offspring
identical. 2. Sexual reproduction: Two parents, involves fusion of gametes, leads to variation.
Q3. What is asexual reproduction? Give examples.
Asexual reproduction involves only one parent. Offspring are genetically identical. Examples: Binary
fission (Amoeba), Budding (Yeast), Fragmentation (Spirogyra).
Q4. What is sexual reproduction?
Sexual reproduction involves formation and fusion of male and female gametes resulting in zygote
formation. It leads to genetic variation.
Q5. Explain events in sexual reproduction.
1. Pre-fertilization: Gamete formation and transfer. 2. Fertilization: Fusion of gametes. 3.
Post-fertilization: Zygote formation and development.
Q6. What is vegetative propagation?
It is a type of asexual reproduction in plants where new plants grow from vegetative parts like root,
stem, or leaves.
Q7. What are clones?
Clones are organisms that are genetically identical to each other and produced through asexual
reproduction.
Q8. Difference between asexual and sexual reproduction.
Asexual: One parent, no variation. Sexual: Two parents, variation present.
Q9. What is lifespan?
, Lifespan is the period from birth to natural death of an organism. It varies from species to species.
Q10. Why is variation important?
Variation helps organisms adapt to changing environment and plays a key role in evolution.
