Photo AI
The diagram shows a vascular bundle from a flowering plant - HSC - SSCE Biology - Question 27 - 2016 - Paper 1
Question 27
The diagram shows a vascular bundle from a flowering plant. (a) On the diagram, clearly label a xylem vessel. (b) A mutation in this species causes the walls of th... show full transcript
Worked Solution & Example Answer:The diagram shows a vascular bundle from a flowering plant - HSC - SSCE Biology - Question 27 - 2016 - Paper 1
Step 1
On the diagram, clearly label a xylem vessel.
Answer
To label a xylem vessel on the diagram, identify the elongated cells typically found in the vascular bundle. Clearly mark one of the larger, hollow structures within the bundle as the 'Xylem Vessel' using an appropriate label next to it.
Step 2
Explain why the leaves of these mutant strains will wilt more easily.
Answer
The xylem vessels are responsible for the transportation of water and nutrients from the roots to the leaves. If the walls of these vessels are significantly reduced in thickness due to mutation, their structural integrity and ability to withstand pressure changes during water transport will be compromised. This weakening means that the vessels are less effective in maintaining adequate water transport, especially under conditions of high transpiration rates. As a result, leaves will receive less water, leading to quicker wilting as they lose turgor pressure necessary for maintaining rigidity and structure.