Which of the following statement is correct ?

Options

A. In mosses sexual reproduction takes place by green, multicellular buds called gemmae
B. The sporophyte of bryophytes is differentiated into foot, seta and capsule and it is a free-living generation
C. Protonema is a green, creeping, branched and filamentous stage in mosses, which develops directly from a spore.
D. The liverworts have an elaborate mechanism of spore dispersal.

Answer

To determine which statement is correct regarding mosses and their reproductive structures, we can analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Understanding the Reproductive Structures in Mosses:**
- Mosses reproduce sexually and asexually. The sexual reproduction involves the formation of gametes, while asexual reproduction can occur through structures like the "jami."

**Hint:** Recall the difference between sexual and asexual reproduction in plants.

2. **Evaluating the First Statement:**
- The statement claims that in mosses, sexual reproduction takes place by a green multicellular bud called "jami."
- This is incorrect because "jami" is associated with asexual reproduction, not sexual reproduction.

**Hint:** Identify the role of "jami" in moss reproduction.

3. **Evaluating the Second Statement:**
- The second statement mentions that the sporophyte of bryophyta is differentiated into a foot, seta, and capsule and is a free-living generation.
- This is also incorrect because, although the sporophyte does consist of these parts, it is not free-living; it is dependent on the gametophyte for nutrition.

**Hint:** Consider the relationship between the sporophyte and gametophyte in mosses.

4. **Evaluating the Third Statement:**
- The third statement describes protenema as a green, creeping, branched, and filamentous stage in mosses that develops directly from spores.
- This statement is correct. Protenema is indeed the first stage of development after a moss spore germinates.

**Hint:** Remember the developmental stages of moss from spore to protenema.

5. **Evaluating the Fourth Statement:**
- The fourth statement asserts that liverworts have an elaborate mechanism of spore disposal.
- This is incorrect because liverworts are primitive plants and do not have complex mechanisms for spore disposal like higher plants do.

**Hint:** Compare the reproductive mechanisms of liverworts with those of higher plants.

### Conclusion:
The correct statement among the options is the third one: "Protenema is a green, creeping, branched and filamentous stage in the mosses which develop directly from spores."