2016年5月19日 星期四

F4 Bio 2nd Term Test 4 Ch9

F4 Biology Test 4: Nutrition and gas exchange in plants

A.     Multiple Choice (10marks)
Q.
1
2
3
4
5
6
7
8
9
10
Answer
A
B
C
D
B
D
C
A
C
D
Wrong no.











B     Conventional questions
1      a, b  nitrogen / phosphorus / potassium / magnesium / sulphur / calcium / iron (any 2)                   1×2
Con:                nitrate is not an element
        c      major elements                                                                                                                        1
        d      trace elements                                                                                                                  1
        e      fertilizers                                                                                                                         1

2      a      Diffusion                                                                                                                         1
Con/Rel:          Photosynthesis / respiration
b      Gases in the atmosphere diffuse into the air space through structure R.                                  1
Gases dissolve in the moist surface of the cells in tissue N and diffuse directly into the cells.        1
Gases in these cells diffuse to the neighbouring cells, finally reaching the cells in tissue M.   1

        c      There are many air spaces among the cells, allowing gases to diffuse freely.                          1
The surface of the cells is moist. This allows gases to dissolve in the moisture and then
diffuse into the cells easily.                                                                                                     1
Rel:         Adaptive feature of leaf

3      a      Independent variable: light intensity                                                                                        1
                Dependent variables: rates of carbon dioxide uptake and release                                            1
Con:                Confusion between i.v. & d.v.

b      Number / surface area of sun leaves and shade leaves / surrounding temperature
(any 2 or other correct answers)                                                                                      1×2
Con:                Weak concept of c.v.

        c      Sun leaves: 2 + 2 = 4 arbitrary units of rate of carbon dioxide uptake                                     1
Shade leaves: 2 + 3.5 = 5.5 arbitrary units of rate of carbon dioxide uptake                           1
Con:                Still do not know the cancelling effect of respiration with photosynthesis

        d      Sun leaves: 5 arbitrary units of light intensity                                                                  1
Shade leaves: 2 arbitrary units of light intensity                                                                       1

        e      Shade leaves reach the compensation point / carry out photosynthesis / produce food

earlier in the day / at lower light intensities.                                                                             1

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