Read the following statements.
(a) Algae are primary producers of energy rich compounds.
(b) Marine algae are producers of hydrocolloids.
(c) Stipe which is the leaf like photosynthetic organ is found in Ectocarpus .
(d) Chlamydomonas shows only isogamous type of sexual reproduction.
(e) Atlantic Ocean's sargasso was named after one of the brown algae.
Select the correct option:

Options

A. All except (b) & (c)
B. All except (a) & (c )
C. All except (d)
D. All except (c) & (d)

Answer

To solve the question, we need to evaluate each of the provided statements about algae and determine which are correct. Let's go through them step by step.

### Step 1: Evaluate Statement A
**Statement A:** Algae are primary producers of energy-rich compounds.
- **Analysis:** This statement is correct. Algae, as photosynthetic organisms, convert sunlight into chemical energy through photosynthesis, producing energy-rich compounds like glucose.

### Step 2: Evaluate Statement B
**Statement B:** Marine algae are producers of hydrocolloids.
- **Analysis:** This statement is also correct. Marine algae, particularly certain types of red and brown algae, produce hydrocolloids, which are water-soluble substances that can form gels or thickeners used in food and other products.

### Step 3: Evaluate Statement C
**Statement C:** Stipe, which is the leaf-like photosynthetic organ, is found in Ectocarpus.
- **Analysis:** This statement is incorrect. In Ectocarpus, the leaf-like photosynthetic organ is called the frond, not the stipe. The stipe is a stalk that supports the frond.

### Step 4: Evaluate Statement D
**Statement D:** Chlamydomonas shows only isogamous type of sexual reproduction.
- **Analysis:** This statement is incorrect. Chlamydomonas can reproduce both isogamously (with gametes of the same size) and anisogamously (with gametes of different sizes).

### Step 5: Evaluate Statement E
**Statement E:** Atlantic Ocean's Sargasso was named after one of the brown algae.
- **Analysis:** This statement is correct. The Sargasso Sea is named after the brown algae Sargassum, which is abundant in that area.

### Conclusion
Now, let's summarize the correctness of each statement:
- Statement A: Correct
- Statement B: Correct
- Statement C: Incorrect
- Statement D: Incorrect
- Statement E: Correct

The correct option would be "all except C and D," as those are the only incorrect statements.

### Final Answer
The correct option is: **All except C and D.**