Biology for IGCSE & O level - Plant Nutrition (Section 5)
1
Leaves have several adaptations for photosynthesis. Which of the following is NOT a characteristic of leaves that aids in photosynthesis?
Answer
(C)
Few chloroplasts
2
Which of the following is NOT a requirement for photosynthesis?
Answer
(D)
Oxygen
3
How does photosynthesis contribute to the carbon cycle?
Answer
(C)
By converting carbon dioxide into glucose and releasing oxygen
4
Which process is directly responsible for the conversion of light energy into chemical energy during photosynthesis?
Answer
(C)
The light-dependent reactions
5
In the context of the experiment, what did the changing color of the hydrogen carbonate indicator signify?
Answer
(C)
Changes in the carbon dioxide level
6
What is the role of accessory pigments, like chlorophyll b, in photosynthesis?
Answer
(B)
To absorb different wavelengths of light and pass the energy to chlorophyll a
7
What is the primary function of the cuticle on a leaf?
Answer
(B)
To prevent water loss
8
Which part of the leaf is responsible for allowing gases to diffuse?
Answer
(C)
The stomata
9
What is a symptom of a plant lacking magnesium ions?
Answer
(C)
Yellowing of leaves (chlorosis)
10
How does a greenhouse help to maximize crop yield?
Answer
A
B
C
D
11
Which of the following factors can increase the rate of photosynthesis in a greenhouse?
Answer
(C)
Increasing the temperature within optimal range
12
What is the main function of the cuticle?
Answer
(C)
To prevent water loss
13
If a plant is deficient in magnesium, what would be the most immediate effect on photosynthesis?
Answer
(C)
Decreased chlorophyll production
14
What is the source of the energy for photosynthesis?
Answer
(C)
Sunlight
15
Why are leaves typically thin?
Answer
(B)
To allow easy diffusion of gases
16
Which part of the leaf controls the rate of gas exchange?
Answer
(C)
Stomata
17
What type of tissue carries water and mineral ions in a leaf?
Answer
(B)
Xylem
18
In the experiment involving the effect of light intensity on the rate of photosynthesis, which of the following variables would be considered as the dependent variable?
Answer
(B)
The number of bubbles produced
19
What are the benefits of the structure of a leaf?
Answer
A
B
C
D
20
During the day, what gases move into and out of a leaf through the stomata?
Answer
(C)
Carbon dioxide in, oxygen out
21
Which of the following is an example of a product produced during the light-independent reactions of photosynthesis?
Answer
(D)
Glucose
22
Which of the following is produced during the process of photosynthesis?
Answer
A
C
23
Where does the process of photosynthesis take place in a plant cell?
Answer
(C)
Chloroplast
24
What would be a valid conclusion if a leaf turns blue-black in the starch test?
Answer
(B)
The leaf contains starch.
25
What type of energy is used to drive the process of photosynthesis?
Answer
(C)
Light Energy
26
What is the function of guard cells in a leaf?
Answer
(C)
To regulate the opening and closing of stomata
27
In the experiment, which color change of the indicator solution would indicate that carbon dioxide is being absorbed by the plant?
Answer
(D)
Red to yellow
28
What is the primary function of the Calvin cycle?
Answer
(C)
To fix carbon dioxide and synthesize glucose
29
What is the role of magnesium ions in a plant?
Answer
(B)
To make chlorophyll
30
What structure allows the entry of carbon dioxide into the leaf?
Answer
(C)
Stomata
31
What are the functions of leaves?
Answer
A
B
D
32
What is the primary function of chlorophyll in photosynthesis?
Answer
(C)
To absorb light energy
33
Which of the following is considered an accessory pigment in photosynthesis?
Answer
(B)
Chlorophyll b
34
Which structures in the leaf are responsible for the absorption of light?
Answer
B
D
35
What is the main function of the palisade mesophyll?
Answer
(B)
To absorb sunlight for photosynthesis
36
Which of the following statements best describes the function of guard cells?
Answer
(B)
They regulate the opening and closing of the stomata.
37
What is the role of the xylem in a leaf?
Answer
(B)
To transport water and ions
38
In an experiment to investigate the effect of light intensity on the rate of photosynthesis, what should be the independent variable?
Answer
(B)
The distance from the light source
39
What are the raw materials needed for photosynthesis?
Answer
(C)
Light energy, carbon dioxide, and water
40
If a plant is deficient in nitrate ions, which substance is it likely to be unable to synthesize effectively?
Answer
(C)
Proteins
41
What happens to the energy in the light-dependent reactions?
Answer
(B)
It is converted into the chemical energy of ATP and NADPH.
42
Why is it important for plants to store glucose as starch?
Answer
(A)
Starch is less soluble than glucose and easier to store.
43
In which leaf layer is the majority of photosynthesis carried out?
Answer
(B)
Palisade mesophyll
44
Which of the following is a key role of the veins in a leaf?
Answer
(B)
To provide support to the leaf
45
In which of the following conditions, the rate of photosynthesis would be the highest?
Answer
(C)
High light intensity, high CO2 concentration, and optimum temperature
46
What is the relationship between temperature and the rate of photosynthesis?
Answer
(C)
The rate increases with temperature up to a certain point then decreases.
47
Which of the following processes does NOT occur during photosynthesis?
Answer
(B)
Conversion of glucose to sucrose
48
What role do the spongy mesophyll cells play in a leaf?
Answer
(B)
Gas exchange
49
Which of the following is a factor that can limit the rate of photosynthesis?
Answer
(B)
The amount of water available
50
What would happen to the rate of photosynthesis if the concentration of carbon dioxide was reduced significantly?
