Explain briefly the following terms with suitabe examples:
(i) Protonema (ii) Antheridium
(iii) Archegonium (iv) Diplontic (v) Sporophyll (vi) Isogamy

Explanation

### Step-by-Step Text Solution

1. **Protonema**:
- Definition: Protonema is a juvenile green, autotrophic, filamentous structure that represents the haploid-independent gametophytic stage in the life cycle of mosses.
- Example: It is produced from the germination of spores and gives rise to new gametophytic plants, such as in the moss Funaria.

2. **Antheridium**:
- Definition: Antheridium is a multicellular jacketed male sex organ found in bryophytes and pteridophytes.
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