The figure represents two guard cells, with surrounding epidermal cells, in the leaf of a plant - VCE - SSCE Biology - Question 2 - 2002 - Paper 1
Question 2
The figure represents two guard cells, with surrounding epidermal cells, in the leaf of a plant. The plant is in bright light. The arrows on the diagram indicate the... show full transcript
Worked Solution & Example Answer:The figure represents two guard cells, with surrounding epidermal cells, in the leaf of a plant - VCE - SSCE Biology - Question 2 - 2002 - Paper 1
Step 1
A. the stomatal pore will decrease in diameter.
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
In this scenario, as water moves from the guard cells to the surrounding epidermal cells, the guard cells lose turgor pressure. This loss of water causes the guard cells to shrink, resulting in the narrowing of the stomatal pore.
Step 2
B. photosynthesis will cease in the guard cells.
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 is incorrect. Photosynthesis primarily occurs in the mesophyll cells, not in the guard cells. While the guard cells play a key role in regulating gas exchange, they do not cease photosynthesis directly.
Step 3
C. carbon dioxide will accumulate in the substomatal chamber.
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
This is unlikely to occur. If the stomatal pores decrease in diameter due to the loss of water, it will limit the entry of carbon dioxide, thus not allowing accumulation in the substomatal chamber.
Step 4
D. potassium ions have moved from the epidermal cells to the guard cells.
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
This statement is not applicable here. In order for guard cells to open, potassium ions typically move into the guard cells from the surrounding cells, not the other way around. The movement of water from guard cells would not facilitate this ion movement.
