O-LevelBiologyRespiration5090/11 · May/June 2010 · Q341 Mark

A germinating seed is soaked in blue dye, which becomes colourless in tissues that are actively respiring. What will be the appearance of the cotyledons, plumule and radicle? [Figure 34.1]

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Acotyledons: blue, plumule: blue, radicle: blue

Bcotyledons: blue, plumule: blue, radicle: colourless

Ccotyledons: colourless, plumule: blue, radicle: colourless

Dcotyledons: colourless, plumule: colourless, radicle: colourless

✓ Correct answer

D: cotyledons: colourless, plumule: colourless, radicle: colourless

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Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2010 Paper 1 Variant 1, question 34.

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