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Biology for IGCSE & O level - Transport In Plants (Section 1)

1
Which of the following is NOT a factor affecting transpiration?
Answer
(C)
Soil composition
2
What would happen to a plant if its stomata permanently closed?
Answer
(C)
It would be unable to get enough carbon dioxide.
3
What is the role of adhesion in the xylem?
Answer
(B)
Water molecules sticking to the xylem walls.
4
Which part of a plant is the source for translocation?
Answer
(B)
Leaves
5
How does increasing wind speed affect the rate of transpiration?
Answer
(B)
Increases transpiration
6
What effect does increased humidity have on the rate of transpiration?
Answer
(B)
Decreases transpiration
7
What causes water to move into the root hair cells?
Answer
(B)
Osmosis
8
What will happen to the rate of transpiration when the humidity increases?
Answer
(B)
It will decrease
9
What is the function of companion cells in the phloem?
Answer
(B)
They load and unload sugars into sieve tube elements
10
What is the main function of the phloem tissue?
Answer
(B)
Transporting sugars produced during photosynthesis
11
What would be the immediate consequence of a plant losing its ability to transpire?
Answer
(B)
The plant would wilt and potentially die.
12
What is the role of root hairs in water uptake?
Answer
(B)
They provide a large surface area for absorption.
13
What effect does an increase in temperature have on the rate of transpiration?
Answer
(A)
Increases transpiration
14
What is the main function of the xylem?
Answer
(B)
To transport water and minerals from the roots to the leaves.
15
What is the primary role of xylem in a plant?
Answer
(B)
Transporting water and minerals from roots to leaves.
16
Which of the following factors can affect the rate of transpiration?
Answer
A
B
C
17
Which of the following is NOT a mechanism of water movement in the xylem?
Answer
(D)
Active transport
18
What is the role of companion cells in phloem transport?
Answer
(B)
Providing energy for sieve tube elements
19
Water enters a root hair cell by osmosis. What are the subsequent steps in the water's journey to the xylem?
Answer
(A)
Root hair cell -> cortex -> xylem
20
Which of the following processes does NOT directly involve the stomata?
Answer
(C)
Absorption of water by root hairs
21
Which of the following is a factor that affects transpiration rate?
Answer
A
B
C
D
22
What is the primary function of the xylem?
Answer
(B)
To transport water and minerals.
23
What is the source in the translocation process?
Answer
(B)
The leaf
24
What is the name of the process by which sugars are transported in a plant?
Answer
(C)
Translocation
25
Which of the following best describes the path of water in a plant?
Answer
(B)
Roots -> xylem -> leaves
26
What is the effect of increased light intensity on transpiration?
Answer
(B)
It increases transpiration
27
What is the main driving force for water movement in the xylem?
Answer
(B)
Transpiration pull
28
Which of the following statements is correct regarding the direction of transport in the phloem?
Answer
(C)
Transport is bidirectional, moving both up and down the plant.
29
What is the primary driving force for the movement of water in the xylem?
Answer
(B)
Transpiration pull
30
Which of the following is the correct sequence of water movement through a plant?
Answer
(C)
Root hair -> Cortex -> Xylem -> Stem -> Leaf
31
What is the role of the xylem vessels in water transport?
Answer
(C)
Transporting water and minerals
32
What happens to water potential when transpiration occurs?
Answer
(B)
Water potential decreases in the leaves
33
What are the two main types of vascular tissue in plants?
Answer
(B)
Phloem and xylem
34
Which tissue in a plant is primarily responsible for transporting water and minerals from the roots to the leaves?
Answer
(B)
Xylem
35
In which direction does water move through the transpiration stream?
Answer
(B)
From roots to leaves.
36
What are the two main tissues involved in the transport of substances in a plant?
Answer
(B)
Xylem and phloem
37
If a plant is wilting, what process is likely being affected?
Answer
(B)
Transpiration
38
What happens to the sugars produced during photosynthesis?
Answer
(C)
They are transported to other parts of the plant through the phloem
39
What is the relationship between humidity and transpiration rate?
Answer
(C)
Higher humidity decreases transpiration rate.
40
What do guard cells do?
Answer
(B)
Control the opening and closing of stomata
41
In the process of transpiration, what is the primary role of the stomata?
Answer
(B)
Allowing water to evaporate from the leaf
42
What is the purpose of the Casparian strip in the root?
Answer
(B)
To regulate water and mineral uptake into the xylem
43
What happens to stomata when the guard cells are turgid?
Answer
(B)
The stomata open.
44
What is the direction of water movement within the transpiration stream?
Answer
(B)
From roots to leaves
45
How does light intensity affect the rate of transpiration?
Answer
(A)
Increases transpiration
46
Which of the following best describes the function of companion cells?
Answer
(B)
Loading and unloading sugars into phloem sieve tubes
47
What is the main role of the phloem in a plant?
Answer
(B)
Transporting sugars.
48
Which of the following is an example of a sink in the translocation process?
Answer
(B)
A developing fruit
49
What is the source in translocation?
Answer
(B)
The leaves
50
What type of molecules is transported by the phloem?
Answer
(B)
Sugars and amino acids