166
Question
To test the effect of an auxin on plant growth, the auxin was dissolved in a gelatin block. Several plant seedlings were prepared and growth was measured every five days.
Plant
Growth after 5 days
Growth after 10 days
1
15 mm
29 mm
2
4 mm
9 mm
3
5 mm
10 mm
4
14 mm
31 mm
5
8 mm
20 mm
Based on the results of the experiment, one can conclude that the tip of the plant contains
| Plant | Growth after 5 days | Growth after 10 days |
| 1 | 15 mm | 29 mm |
| 2 | 4 mm | 9 mm |
| 3 | 5 mm | 10 mm |
| 4 | 14 mm | 31 mm |
| 5 | 8 mm | 20 mm |
Based on the results of the experiment, one can conclude that the tip of the plant contains
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Solution
The correct option is C Auxin
Growth rate in intact plant 1 is 3 mm per day which is reduced in plant 2 upon removal of tip to 1 mm per day. The growth rate is resumed to 3 mm per day upon application of auxin as in plant 4. This means plant tip contain auxin and removal of tip resulted in truncated growth. Therefore, the correct answer is option C.
Growth rate in intact plant 1 is 3 mm per day which is reduced in plant 2 upon removal of tip to 1 mm per day. The growth rate is resumed to 3 mm per day upon application of auxin as in plant 4. This means plant tip contain auxin and removal of tip resulted in truncated growth.
Therefore, the correct answer is option C.
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