Beginning with germination of a moss spore, what is the sequence of structures that develop after germination?
I. embryo II. Gametes III. Sporophyte IV. Potonema V. gametophore

Options

A. IV,V,III,I,II
B. V,IV,III,II,I
C. III,IV,V,II,I
D. IV,V,II,I,III

Answer

To answer the question about the sequence of structures that develop after the germination of a moss spore, we can follow these steps:

1. **Germination of Moss Spore**: The life cycle of moss begins with the germination of a spore. When a moss spore germinates, it first develops into a structure called **protonema**.

2. **Protonema Formation**: The protonema is a thread-like chain of cells that resembles filamentous algae. This is the first structure that develops after the germination of the spore.

3. **Development of Gametophore**: Following the formation of the protonema, the next structure to develop is the **gametophore**. The gametophore is the structure that bears the gametes (male and female).

4. **Formation of Gametes**: The gametophore produces **gametes**. These are the reproductive cells that will eventually fuse to form a zygote.

5. **Zygote Development into Embryo**: After fertilization, the zygote develops into an **embryo**. This is the next stage in the life cycle.

6. **Sporophyte Formation**: Finally, the embryo develops into a **sporophyte**, which is the diploid generation in the moss life cycle. The sporophyte will eventually produce spores through meiosis, completing the cycle.

Thus, the correct sequence of structures that develop after the germination of a moss spore is:
1. Protonema (IV)
2. Gametophore (V)
3. Gametes (II)
4. Embryo (I)
5. Sporophyte (III)

### Final Sequence:
**IV → V → II → I → III**