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The diagram below represents growing seedlings which were subjected to unilatera llight at the beginning of an experiment. (i) State the results of P, Q and R...

      

The diagram below represents growing seedlings which were subjected to unilateral light at the beginning of an experiment.
(i) State the results of P, Q and R after 5 days.
(ii) Account for your results in (i) above
(iii) If the tin foil were removed from the tip of seedling R, what results would be observed after 2 days.
(iv) State the expected results after 3 days if the boxes were removed.

  

Answers

Eric
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(i)
-P will bend/grow towards light
- Q will remain straight/have little or no growth
- R will remain/grow straight/grow upwards

(ii)
P- Growth substance/growth hormone/IAA/auxin are produced by the stem tip
- They move (downwards and get distributed) to the side away from light where they cause
rapid/more growth/cell division/elongation that results in bending
Q- Source of auxin has been removed
R- The auxins cannot be affected by light because the tip has been covered

(iii)It will bend/grow towards light

(iv)All seedlings will grow straight/upwards



ericmunguti answered the question on October 9, 2018 at 04:38

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