Identify the character which is absent in Fucus

Options

A. Nonflagellated male gametes
B. Holdfast
C. Heterogametes
D. Oogamy.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks to identify a character that is absent in Fucus, a genus of brown algae. We have four options to consider.

2. **Analyzing the Options:**
- **Option 1:** Non-flagellated male gametes
- **Option 2:** Holdfast
- **Option 3:** Heterogametes
- **Option 4:** Oogamy

3. **Evaluating Each Option:**
- **Option 1:** Non-flagellated male gametes
- Fucus produces male gametes that are biflagellate (meaning they have two flagella). Therefore, non-flagellated male gametes are indeed absent in Fucus.
- **Option 2:** Holdfast
- Fucus has a holdfast, which is a structure that anchors the algae to rocks. Thus, this character is present in Fucus.
- **Option 3:** Heterogametes
- Fucus produces two different types of gametes (male and female), which qualifies as heterogametes. Therefore, this character is also present in Fucus.
- **Option 4:** Oogamy
- Oogamy is a form of reproduction where the female gamete is larger than the male gamete. Fucus exhibits oogamy, so this character is present as well.

4. **Conclusion:**
After evaluating all the options, the character that is absent in Fucus is **non-flagellated male gametes**. Therefore, the correct answer is **Option 1**.

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