Development of gametophyte directly from the vegetative cells of the sporophyte without the formation of spores is known as :

Question

Accepted Answer

Apospory is the correct answer for the development of gametophyte directly from the vegetative cells of the sporophyte without the formation of spores. Here is a detailed explanation:

1. **Apospory (Option 1):** Apospory is a process in which the gametophyte develops directly from the somatic or vegetative cells of the sporophyte, bypassing the usual spore formation. This phenomenon is observed in some ferns and bryophytes. In apospory, the gametophyte is genetically identical to the sporophyte since it arises from its vegetative cells. This process is a form of asexual reproduction and is significant in the study of plant development and evolution.

2. **Apogamy (Option 2):** Apogamy is a different process where the sporophyte develops directly from the gametophyte without fertilization. This means that the sporophyte arises from the gametophyte without the fusion of gametes. Apogamy is not related to the direct development of gametophytes from sporophyte cells, which is why it is not the correct answer in this context.

3. **Parthenogenesis (Option 3):** Parthenogenesis refers to the development of an organism from an unfertilized egg. It is a form of asexual reproduction commonly seen in animals and some plants. Parthenogenesis does not involve the development of gametophytes from sporophyte cells, making it an incorrect option for this question.

4. **Xenia (Option 4):** Xenia is a term used to describe the effect of pollen on the characteristics of the seed or fruit in plants. It is related to the influence of the male gamete on the endosperm and seed development. Xenia is not related to the development of gametophytes from sporophyte cells, so it is not applicable to this question.

In conclusion, the correct answer is Option 1, Apospory, as it specifically describes the process where gametophytes develop directly from the vegetative cells of the sporophyte without spore formation.