Explain the following three significances of cell division-
- Growth
- Repair
- Reproduction
Tabulate the site of occurrences of meiotic cell division in the living world. [3+2=5]
OR
Explain the process of micropropagation. Distinguish between asexual and sexual reproduction on the basis of the following three features –
- No. of Parental organisms
- Cell Division
- Origin of variation [2+3=5]
Growth:
Cell division increases the number of cells, allowing an organism to grow from a single cell into a mature multicellular body.
Repair:
When tissues are damaged, cell division helps produce new cells that replace damaged or dead cells, maintaining the integrity of the organism.
Reproduction:
Cell division is essential for reproduction; in asexual reproduction, it creates offspring identical to the parent, and in sexual reproduction, meiosis produces gametes with half the genetic material for sexual fusion.
Table: Site of Occurrences of Meiotic Cell Division
| Site | Organisms |
|---|---|
| Testes and ovaries | Humans |
| Gonads | Animals |
| Anthers and ovaries | Plants |
Or
The process of micropropagation in very short points:
- Micropropagation is a technique for rapidly producing clones of plants from a single plant.
- It is done by taking a small piece of tissue from a plant and growing it in a sterile culture medium.
- The tissue will then divide and produce new plants, which are genetically identical to the parent plant.
Here is a table that distinguishes between asexual and sexual reproduction on the basis of the three features you mentioned:
| Feature | Asexual | Sexual |
|---|---|---|
| Number of parental organisms | One | Two |
| Cell division | Mitosis | Meiosis |
| Origin of variation | Low | High |
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