a. Name the plant hormone responsible for plant abscission - VCE - SSCE Biology - Question 3 - 2011 - Paper 1
Question 3
a. Name the plant hormone responsible for plant abscission.
Some Physalis plants abscise fruit containing larvae of a moth predator, Heliothis subflexa. To complete... show full transcript
Worked Solution & Example Answer:a. Name the plant hormone responsible for plant abscission - VCE - SSCE Biology - Question 3 - 2011 - Paper 1
Step 1
a. Name the plant hormone responsible for plant abscission.
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Answer
The plant hormone responsible for abscission is either abscisic acid or ethylene. Both hormones play crucial roles in the process of fruit and leaf drop in response to environmental stressors.
Step 2
b. i. Which species of Physalis is more susceptible to relocation by H. subflexa larvae?
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Species 1: P. pubescens is more susceptible to relocation by H. subflexa larvae, as indicated by a higher percentage of larvae relocating to a new plant.
Step 3
b. ii. From the information given suggest a reason why.
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The reason for this greater susceptibility is likely due to the morphology of P. pubescens, which has drooping branches that position the leaves closer to the ground, making it easier for the larvae to move to adjacent leaves compared to P. angulata, which has upright branches.
