The following is a list of events associated with stomatal opening - VCE - SSCE Biology - Question 6 - 2003 - Paper 1
Question 6
The following is a list of events associated with stomatal opening. In the list, events 1 and 6 are in the correct order.
order (1–6)
event
1
Hydrogen ions mo... show full transcript
Worked Solution & Example Answer:The following is a list of events associated with stomatal opening - VCE - SSCE Biology - Question 6 - 2003 - Paper 1
Step 1
2. The solute concentration in the guard cells becomes greater than in the surrounding cells.
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
When hydrogen ions move out of the guard cells, the concentration of solutes within the guard cells increases. This gradient allows for a higher concentration of solute compared to the surrounding cells.
Step 2
3. The turgidity of the guard cells increases.
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
As solute concentration increases, water enters the guard cells through osmosis, causing them to swell and become turgid.
Step 3
4. Water moves by osmosis into the guard cells.
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
Osmosis occurs as water moves from an area of lower solute concentration (surrounding cells) to an area of higher solute concentration (guard cells), which further aids in increasing turgidity.
Step 4
5. Potassium ions move through the membrane into 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
The uptake of potassium ions into the guard cells helps to maintain the osmotic balance and contributes to the turgor pressure required for stomatal opening.
