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Biology for IGCSE & O level - Plant Nutrition (Section 2)

1
Which of the following is a result of magnesium deficiency in plants?
Answer
(B)
Yellowing of leaves (chlorosis)
2
What is the function of the veins within a leaf?
Answer
(B)
To provide structural support and transport water
3
Which of the following is a function of the spongy mesophyll?
Answer
(B)
Gas exchange
4
What type of environment is most conducive for photosynthesis?
Answer
(A)
High light, high temperature, high CO2
5
Why are plants important for the survival of animals?
Answer
(B)
Plants give off oxygen
6
What is the role of the guard cells in the process of photosynthesis?
Answer
(B)
To regulate gas exchange
7
What is the main product of photosynthesis?
Answer
(C)
Glucose
8
What is the function of the phloem in the leaf?
Answer
(C)
Transporting sugars
9
Which of the following is the main function of the guard cells?
Answer
(B)
To regulate gas exchange
10
How does the arrangement of cells in the palisade mesophyll help with photosynthesis?
Answer
(B)
The cells are tightly packed with many chloroplasts to absorb more light.
11
What is the main function of the cuticle on a leaf?
Answer
(B)
To prevent water loss
12
What is the primary function of chlorophyll in photosynthesis?
Answer
(C)
To capture light energy.
13
What is the function of the spongy mesophyll cells?
Answer
(B)
To regulate gas exchange
14
What is the primary function of the upper epidermis in a leaf?
Answer
(C)
Protection
15
What is the name of the process in which plants release water vapor?
Answer
(C)
Transpiration
16
What is the main purpose of the light-dependent reactions?
Answer
(B)
To convert light energy to chemical energy (ATP and NADPH)
17
Which of these is an example of a way to increase the rate of photosynthesis in a greenhouse?
Answer
A
B
C
18
What part of the leaf is responsible for controlling the opening and closing of stomata?
Answer
(C)
Guard cells
19
Which of the following is a correct description of the leaves of a plant?
Answer
(C)
Leaves have many chloroplasts to absorb light for the reactions that take place in photosynthesis.
20
What is the main function of the cuticle?
Answer
(C)
To prevent water loss
21
What is the purpose of the air spaces within the spongy mesophyll layer?
Answer
(B)
To facilitate gas exchange
22
Why is water important for photosynthesis?
Answer
(B)
It is a reactant in the process.
23
What is the primary function of the spongy mesophyll?
Answer
(B)
To regulate gas exchange.
24
What is the primary function of a leaf's large surface area?
Answer
(B)
To maximize light absorption
25
What would happen if a plant had no stomata?
Answer
(A)
It would not photosynthesize.
26
Which part of the plant absorbs the light energy?
Answer
(C)
The leaves
27
What would happen to the rate of photosynthesis if a plant was placed in a low light environment?
Answer
(C)
The rate would decrease.
28
Which of the following is a correct description of a leaf adaptation?
Answer
(B)
Many chloroplasts in palisade mesophyll cells
29
Which of the following is NOT a feature of leaves that helps them with photosynthesis?
Answer
(D)
Thick cuticle
30
How does the process of photosynthesis benefit other organisms?
Answer
(B)
By releasing oxygen and producing glucose
31
What is the role of the palisade mesophyll cells in a leaf?
Answer
(C)
To conduct photosynthesis
32
If a plant is deficient in mineral ions, what symptoms might it exhibit?
Answer
A
B
C
33
What is the effect of a high concentration of carbon dioxide on the rate of photosynthesis?
Answer
(C)
The rate of photosynthesis will increase.
34
What happens during the opening and closing of stomata?
Answer
(B)
Stomata open due to water entering guard cells and close due to water leaving.
35
Which of the following can be used to measure the rate of photosynthesis?
Answer
A
B
C
36
Which structure inside the palisade mesophyll cells is responsible for carrying out photosynthesis?
Answer
(C)
Chloroplast
37
Which of the following is a common deficiency symptom in plants lacking magnesium ions?
Answer
(B)
Yellowing of leaves (chlorosis)
38
Which of the following features helps leaves absorb light effectively?
Answer
(B)
A thin shape
39
Which of the following leaf adaptations increases the efficiency of photosynthesis?
Answer
(C)
A thin shape
40
What is the role of the palisade mesophyll cells in a leaf?
Answer
(B)
Photosynthesis
41
Which process provides the energy for all living things?
Answer
(B)
Photosynthesis
42
What is the role of guard cells in the opening and closing of stomata?
Answer
(B)
To control gas exchange
43
What is the primary role of stomata in a leaf?
Answer
(B)
To facilitate gas exchange
44
What happens to carbon dioxide in the light?
Answer
(A)
Carbon dioxide diffuses in for photosynthesis
45
During the day, which gas is produced by photosynthesis and diffuses out of the leaf?
Answer
(B)
Oxygen
46
Which of the following is a characteristic of leaves that helps them perform photosynthesis efficiently?
Answer
(B)
Many chloroplasts
47
Which of the following is NOT a product of photosynthesis?
Answer
(D)
Carbon Dioxide
48
Which plant cells would be responsible for transporting sugars from the leaves?
Answer
(B)
Phloem
49
What is the role of nitrate ions in plants?
Answer
(C)
Making proteins
50
Which of the following is NOT a factor affecting the rate of photosynthesis?
Answer
(B)
Soil pH