Reproduction is synonymous with growth / cell division in -
I. Bacteria
II. Hydra
III. Planaria
IV. Unicellular algae
V. Amoeba

Options

A. I, Ill and V
B. I, II and IV
C. I, IV and V
D. All

Answer

To solve the question regarding which organisms have reproduction synonymous with growth or cell division, we will analyze each option step by step.

### Step 1: Understand the Concept
Reproduction in unicellular organisms often occurs through cell division. In these organisms, growth and reproduction are closely linked, making it challenging to distinguish between the two processes.

### Step 2: Analyze Each Option
- **I. Bacteria**: Bacteria reproduce asexually through binary fission, which is a form of cell division. Thus, in bacteria, reproduction is synonymous with growth.

- **II. Hydra**: Hydra is a multicellular organism that reproduces asexually through budding. In multicellular organisms like Hydra, growth and reproduction are separate processes. Therefore, reproduction is not synonymous with growth in Hydra.

- **III. Planaria**: Planaria can reproduce asexually through regeneration, which is also a separate process from growth. Thus, reproduction is not synonymous with growth in Planaria.

- **IV. Unicellular algae**: Similar to bacteria, unicellular algae reproduce through cell division. Therefore, in unicellular algae, reproduction is synonymous with growth.

- **V. Amoeba**: Amoeba is a unicellular organism that reproduces through binary fission, similar to bacteria. Thus, in Amoeba, reproduction is synonymous with growth.

### Step 3: Conclusion
From the analysis:
- **Bacteria (I)**: Yes
- **Hydra (II)**: No
- **Planaria (III)**: No
- **Unicellular algae (IV)**: Yes
- **Amoeba (V)**: Yes

The organisms for which reproduction is synonymous with growth or cell division are **I (Bacteria), IV (Unicellular algae), and V (Amoeba)**.

### Final Answer
The correct options are **I, IV, and V**.

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