Practice question · Put in order
Arrange these events in the order they occur as a tomato ripens.
- The fruit is green, its cells full of chloroplasts
- The plastids are now chromoplasts and the fruit is red
- Chlorophyll is broken down and photosynthesis ceases
- Carotenoid pigments accumulate in the plastids
Hints
- The green pigment must be lost before another colour can show.
- The plastid itself is converted rather than replaced.
Show the answer
- The fruit is green, its cells full of chloroplasts
- Chlorophyll is broken down and photosynthesis ceases
- Carotenoid pigments accumulate in the plastids
- The plastids are now chromoplasts and the fruit is red
Why
The same plastids are converted rather than replaced: chlorophyll is broken down and carotenoids accumulate in place. Ripening is a plastid conversion visible from across the room.
Practise Mitochondria, Plastids and the Plant Cell
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