Being photosynthetic, which organism in absence of sunlight behave like heterotrophs ?

Options

A. Slime moulds
B. Euglenoids
C. Sporozoans
D. Ciliated protozoans

Answer

To answer the question "Being photosynthetic, which organism in absence of sunlight behaves like heterotrophs?" we can follow these steps:

### Step 1: Understand the Organisms Listed
The question provides four options: slime molds, euglenoids, sporozoa, and ciliated protozoa. We need to analyze each of these organisms to determine which one can behave like a heterotroph in the absence of sunlight.

### Step 2: Analyze Each Option
1. **Ciliated Protozoa**: These are primarily heterotrophic organisms that consume organic material. They do not perform photosynthesis, so they do not fit the criteria of being photosynthetic.

2. **Sporozoa**: These are strictly parasitic and non-motile protozoa. They do not perform photosynthesis and rely on their hosts for nutrients, thus they also do not fit the criteria.

3. **Euglenoids**: This group includes organisms like Euglena, which are photosynthetic in the presence of sunlight. However, in the absence of sunlight, they can switch to a heterotrophic mode by consuming organic matter, making them the correct answer.

4. **Slime Molds**: These are primarily heterotrophic organisms that feed on decaying organic matter and do not perform photosynthesis.

### Step 3: Conclusion
After analyzing all options, we conclude that the organism that is photosynthetic and behaves like a heterotroph in the absence of sunlight is **Euglenoids**.

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

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