The evolutionary advanced features of Selaginella are
(a) Heterospory
(b) Endosporic development of gametophyte
(c) Reduced gametophyte
(d) Localization of sporangium bearing appendages in strobili
(e) Unisexual gametophytes
(f) Fertilization with the help of water

Options

A. All are correct.
B. All except (f) are correct.
C. All except (e) and (f) are correct.
D. All except (c) are correct.

Answer

To determine the evolutionary advanced features of Selaginella, we will analyze each of the given options step by step.

### Step-by-Step Solution:

1. **Heterospory**:
- Selaginella exhibits heterospory, which means it produces two different types of spores: microspores (male) and megaspores (female). This is considered an advanced feature because it allows for the differentiation of gametes, enhancing reproductive success.

2. **Endosporic Development of Gametophyte**:
- In Selaginella, the gametophyte develops inside the spore (endosporic development). This means that the gametophyte is protected within the spore until conditions are favorable for germination. This adaptation increases the chances of successful reproduction.

3. **Reduced Gametophyte**:
- The gametophyte stage in Selaginella is reduced in size and duration compared to the sporophyte stage. This shift towards a dominant sporophyte phase is a characteristic of more advanced plant forms.

4. **Localization of Sporangium Bearing Appendages in Strobili**:
- In Selaginella, the sporangia (structures that produce spores) are localized in strobili (cone-like structures). This is an advanced feature because it allows for more efficient reproduction and spore dispersal.

5. **Unisexual Gametophytes**:
- Selaginella produces unisexual gametophytes, meaning that male and female gametophytes are separate. This separation is an advanced evolutionary trait, as it promotes genetic diversity through cross-fertilization.

6. **Fertilization with the Help of Water**:
- While Selaginella requires water for fertilization (the male gametes swim to the female gametes), this is not considered an advanced feature. Advanced plants typically have mechanisms for fertilization that do not depend on water.

### Conclusion:
Based on the analysis, the evolutionary advanced features of Selaginella include:
- (a) Heterospory
- (b) Endosporic development of gametophyte
- (c) Reduced gametophyte
- (d) Localization of sporangium bearing appendages in strobili
- (e) Unisexual gametophytes

The only feature that is not considered advanced is:
- (f) Fertilization with the help of water

### Final Answer:
The evolutionary advanced features of Selaginella are (a), (b), (c), (d), and (e).