There are two different forms of Brassica rapa - VCE - SSCE Biology - Question 15 - 2011 - Paper 1
Question 15
There are two different forms of Brassica rapa. When both forms are grown for 11 days, the following growth pattern is seen.
The rare form of B. rapa is most likely... show full transcript
Worked Solution & Example Answer:There are two different forms of Brassica rapa - VCE - SSCE Biology - Question 15 - 2011 - Paper 1
Step 1
produce excess gibberellin.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The rare form of B. rapa is likely to produce excess gibberellin. Gibberellin is a plant hormone that promotes stem elongation and growth. Given that the common form shows more pronounced growth, it suggests that the rare form may have a hormonal imbalance affecting its growth.
Step 2
be unable to bend towards the light.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
This statement refers to phototropism, where plants bend toward light. If the rare form cannot bend towards light, it might be due to its inability to produce necessary growth hormones effectively, leading to poor phototropic response.
Step 3
have an increased production of ethylene.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Ethylene is another plant hormone involved in growth regulation. An increase in ethylene could lead to abnormal growth patterns, but the evidence provided suggests that this is less likely than the effect of gibberellin.
Step 4
have a reduced production of cytokinins.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Cytokinins are involved in cell division and growth regulation. If the rare form has reduced cytokinin production, it may contribute to stunted growth; however, hormonal interaction should be considered as cytokinins work alongside other hormones.
