The given statements describe a group of organisms.
(i) Instead of a cell wall they have a protein rich pellicible making their body flexible.
(ii) They have 2 flagella, a short and a long one.
(iii) They show mixotrophic nutrition
(iv) They are connecting link between plants and animals.
which of the following groups is referred to here?

Options

A. Dinoflagellates
B. Slime moulds
C. Desmids and diatoms
D. Euglenoids

Answer

To solve the question regarding the group of organisms described by the given statements, we will analyze each statement step by step.

### Step 1: Analyze the first statement
- **Statement**: "Instead of a cell wall they have a protein-rich pellicle making their body flexible."
- **Analysis**: This feature indicates that the organisms do not have a rigid cell wall, which is characteristic of euglenoids. Euglenoids possess a pellicle made of proteins that allows flexibility.

**Hint**: Look for organisms that have a flexible outer structure instead of a traditional cell wall.

### Step 2: Analyze the second statement
- **Statement**: "They have 2 flagella, a short and a long one."
- **Analysis**: This is another defining feature of euglenoids. They are known to have two flagella, one longer and one shorter, which help in movement.

**Hint**: Identify organisms that are known for having two distinct flagella.

### Step 3: Analyze the third statement
- **Statement**: "They show mixotrophic nutrition."
- **Analysis**: Euglenoids exhibit mixotrophic nutrition, meaning they can perform both autotrophic (photosynthesis) and heterotrophic (feeding on other organisms) nutrition depending on environmental conditions.

**Hint**: Consider organisms that can switch between making their own food and consuming others based on their surroundings.

### Step 4: Analyze the fourth statement
- **Statement**: "They are a connecting link between plants and animals."
- **Analysis**: This statement aligns with the characteristics of euglenoids, as they possess traits of both plants (due to their ability to photosynthesize) and animals (due to their ability to consume food).

**Hint**: Think about organisms that exhibit features of both plant and animal kingdoms.

### Conclusion
After analyzing all the statements, we conclude that the group of organisms referred to in the question is **Euglenoids**.

### Final Answer
The correct answer is **Euglenoids**.