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Step-by-Step Explanation
Step 1: Recognizing the Phenomenon
When tomato seedlings are grown in the absence of light (in a dark room), they lose their green color and become pale or white. This distinct appearance is due to the lack of chlorophyll formation, which normally gives plants their green color.
Step 2: Understanding the Underlying Reason
Chlorophyll synthesis in plants is light-dependent. In the complete absence of light, the biochemical pathways that produce chlorophyll are not activated, leading to pale or white stems and leaves. The absence of green pigments indicates that the seedlings are not photosynthesizing effectively.
Step 3: Defining Etiolation
The term etiolation refers to the morphological and physiological changes that occur when plants grow in insufficient or no light. When etiolated, plants:
Have elongated stems to reach for any available light sources.
Appear pale or white due to lack of chlorophyll.
Develop thinner, fragile stems and smaller leaves.
Show reduced leaf expansion and weaker root systems.
Step 4: Linking Observation to Etiolation
In this question, the tomato seedlings turned white when kept in the dark. This is a classic example of etiolation, where the plant's normal development is hindered by the absence of light.
Conclusion
Hence, the correct term to describe the white-colored tomato seedlings grown in darkness is Etiolated.
