Final answer:
Out of the given options, ferns are capable of reproducing through natural asexual cell division such as fragmentation. Ferns along with other seedless plants do not depend on seeds but can grow new plants from fragments of the parent plant.
Step-by-step explanation:
Many plant species can reproduce asexually through natural methods such as vegetative reproduction, which includes processes like fragmentation, budding, and the production of adventitious roots or runners. However, out of the options provided - conifers, ferns, petunias, and sunflowers - ferns are the ones that can reproduce naturally through asexual cell division. Ferns, along with other seedless plants, are known to reproduce asexually through methods such as fragmentation, where a small fragment of the plant can grow into a new plant. The process does not involve seeds but rather the propagation of plant parts, making it a form of asexual reproduction.
Asexual reproduction in plants generally leads to progeny that are genetically identical to the parent, and it can be advantageous in stable environments where the exact genetic traits of the parent plant are well-suited for survival. This mode of reproduction is efficient and can allow for faster maturity compared to the growth from a seed, which is a product of sexual reproduction. While many flowering plants also possess the ability to reproduce asexually, they usually do so either through artificial methods or less commonly through natural asexual strategies.