[10] 1.2
Study the graph below and answer the questions that follow.
Changes in the water potential of guard cells
and the lower epidermal cells
lower epidermal cells
-1000
-1100
Water potential (kPa)
-1200
guard cells
- 1 300
-1 400
Х
Y
Time
1.2.1
1.2.2
1.2.3
State the main difference between the graphs for the lower epidermal cells and for
the guard cells.
(2)
What is the water potential of the guard cells at time X?
Will the stomata of the plant be open or closed at time Y?
Explain your answer.
(3)
[7]​

answer-

the statement that f(x) = |x+a| + b has exactly one x-intercept is sometimes correct.

solution-

it solely depends on b, whether the function will have one or two or zero x intercept.

this plot of the given function, f(x) = |x+a| + b will be the basic absolute value graph i.e v shape, with vertex translated to (-a, b), instead of origin.

1-   if b is zero, the graph will have exactly one x-intercept, at x= -a

2- if b is positive, the whole graph will be above the x-axis, hence it will have no x-intercepts.

3- if b is negative, the graph will be below the x-axis, hence it will have two x-intercepts.

∴ the statement is sometimes true.

the correct answer is d