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Q6:
Distinguish between asexual and sexual reproduction. Why is vegetative reproduction also considered as a type of asexual reproduction?
Solution :
Step 1: Fundamental Distinction Between Asexual and Sexual Reproduction
Reproduction is the biological process by which new individual organisms (offspring) are produced from their parents. Based on the participation of one or two organisms and the cellular mechanisms involved, reproduction is broadly categorized into asexual and sexual modes. The fundamental distinctions are delineated across genetic, cellular, and evolutionary parameters.
| Parameter | Asexual Reproduction | Sexual Reproduction |
|---|---|---|
| Parental Involvement | Uniparental [Involves a single parent organism]. | Biparental (generally) [Involves two parents of opposite sexes, though hermaphroditic organisms can self-fertilize]. |
| Gamete Formation & Fusion | No gamete formation or fusion (syngamy) occurs. | Involves the formation of male and female gametes ($n$) and their subsequent fusion to form a zygote ($2n$). |
| Cellular Division | Relies exclusively on Somatic Mitosis [equation division preserving ploidy]. | Involves Meiosis [reduction division for gametogenesis] followed by Mitosis [for zygotic development]. |
| Genetic Constitution | Offspring are genetically and morphologically identical to the parent, termed as clones. | Offspring exhibit genetic variation due to crossing over (recombination) during prophase-I of meiosis and the random fusion of gametes. |
| Rate of Reproduction | Exponentially faster; requires less energy and time. | Comparatively slower; highly complex and energy-intensive. |
| Evolutionary Significance | Low [Lacks genetic variation, making populations highly susceptible to environmental changes]. | High [Introduces genetic variations which act as raw material for natural selection and speciation]. |
Step 2: Analytical Justification for Vegetative Reproduction as Asexual Reproduction
Vegetative reproduction (or vegetative propagation) is a phenomenon primarily observed in higher plants, where specific somatic structural units—termed vegetative propagules (e.g., runners, rhizomes, suckers, tubers, offsets, and bulbs)—give rise to independent offspring. This process is categorically classified as a form of asexual reproduction based on the following rigorous biological criteria:
- Uniparental Inheritance: The new plant arises from the vegetative part of a single parent plant. [Per the axioms of reproductive biology, uniparental derivation without gametic interaction defines asexuality].
- Absence of Syngamy and Meiosis: The propagules develop directly from the somatic cells of the parent plant. There is strictly no involvement of meiosis (reductional division) and no fusion of male and female gametes (fertilization).
- Mitotic Cellular Mechanisms: The growth and development of the vegetative propagule rely purely on mitotic cell divisions. Consequently, the genomic integrity and ploidy level ($2n$) of the parent are conserved perfectly in the progeny.
- Clonal Production: Because the offspring are exact genetic replicas of the parent plant, they constitute a clone. [The generation of clones is the definitive hallmark of asexual reproduction].
Step 3: Visual Proof of Pathway Equivalency
The topological flowchart below outlines the cellular mechanisms mathematically proving that the pathway of vegetative reproduction perfectly aligns with the pathway of asexual reproduction, contrasting sharply with sexual mechanisms.
Final Solution: Asexual reproduction involves a single parent, relies entirely on mitosis, and produces genetically identical offspring (clones), whereas sexual reproduction requires the fusion of gametes generated via meiosis, yielding genetically distinct recombinants. Vegetative reproduction mathematically and biologically fulfills all conditions of asexual reproduction—being uniparental, amitotic in respect to germ cells, lacking syngamy, and yielding morphological and genetic clones—thus conclusively classifying it as an asexual reproductive modality in higher plants.
More Questions from Class 12 Biology Reproduction in Organisms EXERCISES
- Q1: Why is reproduction essential for organisms?
- Q1: Why is reproduction essential for organisms?
- Q2: Which is a better mode of reproduction: sexual or asexual? Why?
- Q2: Which is a better mode of reproduction: sexual or asexual? Why?
- Q3: Why is the offspring formed by asexual reproduction referred to as clone?
- Q3: Why is the offspring formed by asexual reproduction referred to as clone?
- Q4: Offspring formed due to sexual reproduction have better chances of survival. Why? Is this statement always true?
- Q4: Offspring formed due to sexual reproduction have better chances of survival. Why? Is this statement always true?
- Q5: How does the progeny formed from asexual reproduction differ from those formed by sexual reproduction?
- Q5: How does the progeny formed from asexual reproduction differ from those formed by sexual reproduction?
- Q6: Distinguish between asexual and sexual reproduction. Why is vegetative reproduction also considered as a type of asexual reproduction?
- Q7: What is vegetative propagation? Give two suitable examples.
- Q7: What is vegetative propagation? Give two suitable examples.
- Q8(a): Define (a) Juvenile phase,
- Q8(a): Define (a) Juvenile phase,
- Q8(b): Define (b) Reproductive phase,
- Q8(b): Define (b) Reproductive phase,
- Q8(c): Define (c) Senescent phase.
- Q8(c): Define (c) Senescent phase.
- Q9: Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?
- Q9: Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?
- Q10: Explain why meiosis and gametogenesis are always interlinked?
- Q10: Explain why meiosis and gametogenesis are always interlinked?
- Q11(a): Identify each part in a flowering plant and write whether it is haploid (\(n\)) or diploid (\(2n\)). (a) Ovary ———————————
- Q11(a): Identify each part in a flowering plant and write whether it is haploid ((n)) or diploid ((2n)). (a) Ovary ———————————
- Q11(b): Identify each part in a flowering plant and write whether it is haploid (\(n\)) or diploid (\(2n\)). (b) Anther ———————————
- Q11(b): Identify each part in a flowering plant and write whether it is haploid ((n)) or diploid ((2n)). (b) Anther ———————————
- Q11(c): Identify each part in a flowering plant and write whether it is haploid (\(n\)) or diploid (\(2n\)). (c) Egg ———————————
- Q11(c): Identify each part in a flowering plant and write whether it is haploid ((n)) or diploid ((2n)). (c) Egg ———————————
- Q11(d): Identify each part in a flowering plant and write whether it is haploid (\(n\)) or diploid (\(2n\)). (d) Pollen ———————————
- Q11(d): Identify each part in a flowering plant and write whether it is haploid ((n)) or diploid ((2n)). (d) Pollen ———————————
- Q11(e): Identify each part in a flowering plant and write whether it is haploid (\(n\)) or diploid (\(2n\)). (e) Male gamete ———————————
- Q11(e): Identify each part in a flowering plant and write whether it is haploid ((n)) or diploid ((2n)). (e) Male gamete ———————————
- Q11(f): Identify each part in a flowering plant and write whether it is haploid (\(n\)) or diploid (\(2n\)). (f) Zygote ———————————
- Q11(f): Identify each part in a flowering plant and write whether it is haploid ((n)) or diploid ((2n)). (f ) Zygote ———————————
- Q12: Define external fertilisation. Mention its disadvantages.
- Q12: Define external fertilisation. Mention its disadvantages.
- Q13: Differentiate between a zoospore and a zygote.
- Q13: Differentiate between a zoospore and a zygote.
- Q14: Differentiate between gametogenesis from embryogenesis.
- Q14: Differentiate between gametogenesis from embryogenesis.
- Q15: Describe the post-fertilisation changes in a flower.
- Q15: Describe the post-fertilisation changes in a flower.
- Q16: What is a bisexual flower? Collect five bisexual flowers from your neighbourhood and with the help of your teacher find out their common and scientific names.
- Q16: What is a bisexual flower? Collect five bisexual flowers from your neighbourhood and with the help of your teacher find out their common and scientific names.
- Q17: Examine a few flowers of any cucurbit plant and try to identify the staminate and pistillate flowers. Do you know any other plant that bears unisexual flowers?
- Q17: Examine a few flowers of any cucurbit plant and try to identify the staminate and pistillate flowers. Do you know any other plant that bears unisexual flowers?
- Q18: Why are offspring of oviparous animals at a greater risk as compared to offspring of viviparous animals?
- Q18: Why are offspring of oviparous animals at a greater risk as compared to offspring of viviparous animals?
CBSE Solutions for Class 12 Biology Reproduction in Organisms
Chapters in CBSE - Class 12 Biology
- Human Reproduction
- Reproductive Health
- Principles of Inheritance and Variation
- Molecular Basis of Inheritance
- Evolution
- Human Health and Disease
- Strategies for Enhancement in Food Production
- Microbes in Human Welfare
- Biotechnology: Principles and Processes
- Biotechnology and Its Applications
- Organisms and Populations
- Ecosystem
- Biodiversity and Conservation
- Environmental Issues
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