What is adventive polyembryony?

Answer

### Step-by-Step Solution:

1. **Understanding Polyembryony**:
- Polyembryony refers to the phenomenon where more than one embryo develops from a single fertilized ovule. This means that within one seed, multiple embryos can be formed.

2. **Types of Polyembryony**:
- There are different types of polyembryony, but in the case of adventive polyembryony, the embryos are formed from somatic or sporophytic cells rather than from fertilized egg cells.

3. **Formation of Embryos**:
- In adventive polyembryony, embryos can develop from the integuments (the outer layers of the ovule) or from new cells that arise in the ovule. This is significant because it shows that the embryos are not a result of the fusion of gametes.

4. **Asexual Reproduction**:
- Adventive polyembryony is a type of asexual reproduction. This means that the seeds produced do not require fertilization (syngamy) to develop. Instead, they can form embryos without the union of male and female gametes.

5. **Conclusion**:
- In summary, adventive polyembryony is the process where multiple embryos develop from a single ovule through asexual means, specifically from somatic or sporophytic cells, leading to the formation of seeds without fertilization.