Select an incorrect statement about algae?

Options

A. they are simple , thalloid, and largely aquatic
B. they occur in a variety of habitats including wood
C. some of them also occur on animals e.g., on sloth bear
D. the form and size of algae is highly constant

Answer

To solve the question "Select an incorrect statement about algae," we will analyze each of the provided options step by step.

### Step 1: Analyze the First Option
**Statement:** Algae are simple, thalloid, and largely aquatic.

**Evaluation:** This statement is true. Algae are indeed simple organisms that lack complex structures and are primarily found in aquatic environments.

### Step 2: Analyze the Second Option
**Statement:** Algae occur in a variety of habitats, including wood.

**Evaluation:** This statement is also true. Algae can be found in various habitats, including moist soils, rocks, and even on wood.

### Step 3: Analyze the Third Option
**Statement:** Some of them also occur on animals, example on sloth fur.

**Evaluation:** This statement is true as well. Certain algae, such as Trichophilus, can inhabit the fur of sloths, demonstrating that they can live on animals.

### Step 4: Analyze the Fourth Option
**Statement:** The form and size of algae is highly constant.

**Evaluation:** This statement is incorrect. The form and size of algae vary significantly. Algae can be unicellular or multicellular and come in various forms such as red, green, brown, and blue-green algae. Their sizes also range from tiny pico plankton (0.2 to 2 micrometers) to giant kelp, which can reach lengths of up to 60 meters.

### Conclusion
The incorrect statement about algae is: "The form and size of algae is highly constant."

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