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Q13:
Differentiate between a zoospore and a zygote.
Solution :
Core Biological Definitions
In the study of biological reproduction, a zoospore and a zygote represent two fundamentally distinct cellular structures involved in the propagation of species. They differ primarily in their developmental origin, ploidy level, and locomotive capabilities.
Step 1: Analysis of Origin and Formation
A zoospore is a specialized asexual reproductive unit. It is produced endogenously within a sac-like structure known as a zoosporangium. Depending on the parent organism's life cycle, zoospores are formed via mitosis (in haplontic organisms) or meiosis (in some diplontic organisms). Conversely, a zygote is the universal product of sexual reproduction. It is formed by syngamy—the physical and genetic fusion of a haploid male gamete ($n$) and a haploid female gamete ($n$).
Step 2: Analysis of Ploidy Level and Motility
Because it is a product of syngamy, a zygote is invariably a diploid structure ($2n$), containing homologous chromosomes from two different parents. In contrast, the ploidy of a zoospore is dependent on its parent; it is typically haploid ($n$) but can be diploid ($2n$) in specific algae. Morphologically, zoospores are characterized by the presence of one or more flagella, rendering them highly motile in aquatic environments. Zygotes are generally non-motile (with rare exceptions in primitive thallophytes) and often develop a thick protective wall to survive unfavorable conditions.
Step 3: Morphological and Structural Visualization
The structural divergence between these two cells reflects their ecological functions: zoospores are adapted for rapid dispersal, while zygotes are adapted for genetic recombination and stage transitions.
Step 4: Comprehensive Comparative Analysis
The distinguishing parameters between the two biological structures are formalized in the following table:
| Feature | Zoospore | Zygote |
|---|---|---|
| Reproductive Mode | It is an asexual reproductive spore. | It is the fundamental product of sexual reproduction. |
| Formation Process | Formed by the division (usually mitosis) of the protoplast inside a zoosporangium. | Formed by the physical and genetic fusion of two haploid gametes (syngamy). |
| Ploidy Level | Typically haploid ($n$), though it can be diploid depending on the parent plant (e.g., in some macroalgae). | Universally diploid ($2n$), containing homologous chromosomes from both parents. |
| Motility | Highly motile due to the presence of one, two, or multiple flagella. | Generally non-motile (lacks flagella), usually acting as a stationary resting stage. |
| Developmental Fate | Germinates directly into a new independent individual. | Undergoes embryogenesis (mitosis) or zygotic meiosis to form the next generation. |
| Examples | Produced by fungi (e.g., Phytophthora) and algae (e.g., Chlamydomonas, Ulothrix). | Formed in all sexually reproducing organisms (plants, animals, and fungi). |
Final Solution: A zoospore is a flagellated, motile, asexual spore that directly gives rise to a new individual and can be haploid or diploid. In contrast, a zygote is a non-motile, universally diploid cell formed by the fusion of male and female gametes during sexual reproduction, serving as the critical developmental link between successive generations.
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?
- 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.
- 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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