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All types of plastids possess essentially the same structure because they:

1. perform the same function
2. store food materials like starch, fat and protein
3. occur in aerial parts
4. can transform from one form to another

Correct answer: can transform from one form to another

Solution

Plastids are structurally similar because one plastid type can differentiate into another, so they share a common basic organization. Their form changes with the cell’s needs, which explains why they are not fixed to one structure.

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