Read the following statements and use one of the combinations to fill the gaps. In Chlamydomonas, Volvox, & spirogyra fusion of gametes is………… , …………& ………. respectively

Options

A. isogamous , anisogamous & oogamous
B. oogamous ,isogamous & anisogamous
C. anisogamous ,oogamous & isogamous
D. isogamous , isogamous & anisogamous

Answer

To solve the question regarding the fusion of gametes in Chlamydomonas, Volvox, and Spirogyra, we need to understand the types of gametic fusion that occur in these organisms. Here’s a step-by-step breakdown:

### Step 1: Identify the type of gametic fusion in Chlamydomonas
- Chlamydomonas exhibits **anisogamy**. This means that the male and female gametes are of different sizes. The male gamete is smaller and motile, while the female gamete is larger and can be either motile or non-motile.

### Step 2: Identify the type of gametic fusion in Volvox
- Volvox shows **oogamy**. In this type, the female gamete is large and non-motile, while the male gamete is smaller and motile (flagellated).

### Step 3: Identify the type of gametic fusion in Spirogyra
- Spirogyra exhibits **isogamy**. In isogamy, both male and female gametes are similar in size and structure, and they can be either motile or non-motile.

### Conclusion
Now that we have identified the types of gametic fusion for each organism, we can fill in the gaps in the statement:
- In Chlamydomonas, Volvox, and Spirogyra, the fusion of gametes is **anisogamy**, **oogamy**, and **isogamy**, respectively.

### Final Answer
The answer is:
- Chlamydomonas: Anisogamy
- Volvox: Oogamy
- Spirogyra: Isogamy