Green algae are ancestors of angiosperms/land plants because

Options

A. both have vascular bundles
B. both have starch as reserve food
C. both have jacketed sex organs
D. all of the above

Answer

To answer the question, "Green algae are ancestors of angiosperms/land plants because," we need to analyze the provided options and determine which one correctly supports the relationship between green algae and angiosperms.

### Step-by-Step Solution:

1. **Understanding Green Algae**:
- Green algae, also known as Chlorophyta, are primarily freshwater organisms and can also be found in sub-aerial environments. They possess chloroplasts containing chlorophyll a, chlorophyll b, and carotenoids, which are essential for photosynthesis.

2. **Analyzing the Options**:
- **Option 1: Both have vascular bundles**:
- This option is incorrect because green algae do not have vascular bundles. Vascular bundles are characteristic of higher plants, including angiosperms.

- **Option 2: Both have starch as reserve food**:
- This option is correct. Both green algae and angiosperms store starch as their reserve food. In green algae, the presence of pyrenoids within chloroplasts facilitates the storage of starch.

- **Option 3: Both have jacketed sex organs**:
- This option is incorrect because green algae do not possess jacketed sex organs, which are found in higher plants, including angiosperms.

- **Option 4: All of the above**:
- Since options 1 and 3 are incorrect, this option is also incorrect.

3. **Conclusion**:
- The only correct option that supports the idea that green algae are ancestors of angiosperms is **Option 2: both have starch as reserve food**. This shared characteristic indicates a close evolutionary relationship.

### Final Answer:
Green algae are ancestors of angiosperms/land plants because **both have starch as reserve food** (Option 2).