Formation of gametophyte from sporophyte without production of spores is called apospory .

Answer

**Step-by-Step Solution:**

1. **Understanding the Terms:**
- **Sporophyte:** The diploid phase in the plant life cycle that produces spores through meiosis.
- **Gametophyte:** The haploid phase that produces gametes (sperm and eggs) through mitosis.
- **Apospory:** A process where gametophytes develop directly from the sporophyte without the formation of spores.

2. **Identifying the Process:**
- In apospory, gametophytes are formed directly from the sporophyte tissue.
- This process occurs without the usual step of meiosis that leads to spore formation.

3. **Characteristics of Apospory:**
- The gametophytes produced are diploid (2N) instead of haploid (N).
- Since meiosis does not occur, the typical haploid spores are not formed.
- The cells formed in this process are vegetative and non-reproductive.

4. **Occurrence in Plant Groups:**
- Apospory is primarily observed in certain groups of Pteridophyta (ferns and their relatives).
- This is an unusual reproductive strategy that allows for the direct development of gametophytes from sporophytes.

5. **Conclusion:**
- The statement "Formation of gametophyte from sporophyte without production of spores is called apospory" is true.
- Apospory is a unique process in the life cycle of some pteridophytes.