Plastids are found in :-

Options

A. All plant cells and in Euglenoids
B. All animals cells and in euglenoids
C. All bacteria and animal cells
D. All plants and bacteria

Answer

**Step-by-Step Solution:**

1. **Understanding Plastids**: Plastids are specialized organelles found in cells. They are primarily associated with photosynthesis and storage functions in plants and some other organisms.

2. **Types of Plastids**: There are three main types of plastids:
- **Chloroplasts**: These are involved in photosynthesis and contain chlorophyll.
- **Chromoplasts**: These are responsible for pigment synthesis and storage, contributing to the color of fruits and flowers.
- **Leucoplasts**: These are involved in the storage of starches, oils, and proteins.

3. **Identifying the Organisms**:
- **Plant Cells**: Plastids are present in all plant cells as they are essential for photosynthesis and other functions.
- **Euglenoids**: These are eukaryotic organisms that can perform photosynthesis and contain plastids, specifically chloroplasts.
- **Animal Cells**: Plastids are absent in animal cells as they do not perform photosynthesis.
- **Bacterial Cells**: Bacteria do not have plastids as they lack membrane-bound organelles.

4. **Evaluating the Options**:
- **Option 1**: All plant cells and euglenoids - This is correct since both contain plastids.
- **Option 2**: All animal cells and euglenoids - This is incorrect as animal cells do not have plastids.
- **Option 3**: All bacterial cells and all plant cells - This is incorrect as bacteria do not have plastids.
- **Option 4**: All plant cells and bacterial cells - This is incorrect as bacteria do not have plastids.

5. **Conclusion**: The correct answer is **Option 1: All plant cells and euglenoids**.

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