Read the following statements regarding euglenoids and select the incorrect ones.
(i) These are mostly freshwater organisms found in stagnant water.
(ii) Their body is covered by a protein rich layer called pellicle which makes their body flexible.
(iii) They are photosynthetic in the presence of sunlight but become heterotrophs in the absence of sunlight.
(iv) They usually prosses tow flagella, one long and one short.
(v) Euglenoids are multicellular ciliate protists

Options

A. i and v
B. iv and v
C. iii only
D. v only

Explanation

To solve the question regarding euglenoids and identify the incorrect statement, we can follow these steps:

### Step 1: Analyze each statement
- **Statement (i)**: "These are mostly freshwater organisms found in stagnant water."
- **Analysis**: This is true. Euglenoids are primarily found in freshwater environments, particularly in stagnant water bodies.

- **Statement (ii)**: "Their body is covered by a protein-rich layer called pellicle which makes their body flexible."
- **Analysis**: This is also true. Euglenoids have a pellicle that provides flexibility to their structure.

- **Statement (iii)**: "They are photosynthetic in the presence of sunlight but become heterotrophs in the absence of sunlight."
- **Analysis**: This statement is true as well. Euglenoids can perform photosynthesis when light is available and switch to heterotrophic nutrition when light is not available.

- **Statement (iv)**: "They usually possess two flagella, one long and one short."
- **Analysis**: This statement is true. Euglenoids typically have two flagella, one longer and one shorter.

- **Statement (v)**: "Euglenoids are multicellular ciliate protists."
- **Analysis**: This statement is incorrect. Euglenoids are unicellular organisms, not multicellular, and they do not have cilia; instead, they have flagella.

### Step 2: Identify the incorrect statement
Based on the analysis, the incorrect statement is:
- **Statement (v)**: "Euglenoids are multicellular ciliate protists."

### Final Answer
The incorrect statement regarding euglenoids is statement (v).

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