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Biology for IGCSE & O level - Transport In Plants (Section 3)

1
What is the role of turgor pressure in plant cells?
Answer
A
B
C
2
What is the function of the stomata on a leaf?
Answer
(C)
To facilitate gas exchange and regulate water loss.
3
Which of the following is NOT a component of the transpiration stream?
Answer
(D)
Active transport of sugars
4
What happens to the stomata when the guard cells lose water?
Answer
(B)
The stomata close
5
Which of the following is transported in the xylem?
Answer
(C)
Water and minerals
6
What is the function of the casparian strip?
Answer
(B)
To control water uptake into the xylem
7
What happens when the guard cells take in water?
Answer
(B)
The stoma opens
8
In what direction does translocation occur?
Answer
(B)
From leaves to roots and other parts of the plant
9
What are the key processes involved in the transpiration stream?
Answer
A
B
D
10
What is the primary function of xylem tissue in a plant?
Answer
(B)
Transporting water and minerals from the roots to the leaves.
11
What is the process by which water is lost from the leaves of a plant?
Answer
(B)
Transpiration
12
What is the role of the guard cells in a leaf?
Answer
(B)
To control the opening and closing of the stomata
13
Which process does the plant use to move sucrose from the leaves to the fruits?
Answer
(C)
Translocation
14
What happens to the rate of transpiration when the light intensity increases?
Answer
(A)
Increases
15
What is the main function of the cuticle on a leaf?
Answer
(B)
To prevent water loss
16
What is the main function of the stomata in a leaf?
Answer
(B)
To facilitate gas exchange and water loss
17
Which of the following is a key adaptation of root hair cells to enhance water absorption?
Answer
(D)
Large surface area
18
What is the role of the phloem in a plant?
Answer
(B)
Transporting sugars from leaves to other parts
19
What is the role of the phloem in a plant?
Answer
(B)
To transport sugars and amino acids from the leaves to other parts of the plant.
20
What is the main function of the waxy cuticle on a leaf?
Answer
(B)
To prevent water loss.
21
What is the role of the Casparian strip in the endodermis?
Answer
(B)
To regulate the entry of water and minerals into the xylem.
22
Which of the following terms best describes the movement of sugars through the phloem?
Answer
(B)
Translocation
23
Which of the following statements is TRUE about how the rate of transpiration changes with temperature?
Answer
(A)
Increasing temperature increases transpiration.
24
What is the process that draws water up through the xylem in a plant?
Answer
(C)
Transpiration pull
25
What type of cells control the opening and closing of the stomata?
Answer
(C)
Guard cells
26
What process is primarily responsible for water uptake by roots?
Answer
(B)
Osmosis
27
What are the main components of phloem sap?
Answer
(B)
Sugars and amino acids
28
Which of the following factors have an impact on the rate of transpiration in plants?
Answer
A
B
C
29
In the pressure flow hypothesis for translocation, how is the movement of sugars in the phloem driven?
Answer
(A)
By the difference in water potential between the source and the sink.
30
What are the roles of the pholem tubes?
Answer
(A)
Transporting sugars and amino acids throughout the plant
31
What part of a plant cell helps the xylem tubes remain strong so they don't collapse under the pressure of water transport?
Answer
(B)
Lignin
32
In which part of the plant does photosynthesis mainly take place?
Answer
(C)
Leaves
33
What is the primary function of the Casparian strip in the root endodermis?
Answer
(B)
To regulate water and mineral uptake into the xylem.
34
What would be the impact on water uptake if the soil had very low water potential?
Answer
(C)
Water uptake would be slower.
35
Which of the following is a direct result of transpiration?
Answer
(C)
Movement of water and minerals up the xylem.
36
What drives the movement of water up a plant against gravity?
Answer
(C)
Transpiration pull
37
What is the function of the vascular cambium in a plant?
Answer
(C)
To produce new xylem and phloem cells.
38
Which of the following substances are transported in the phloem?
Answer
A
B
39
What is the function of sieve tube elements in phloem transport?
Answer
(C)
They transport sugars and other organic molecules throughout the plant.
40
What is the primary function of the root hairs?
Answer
(C)
To absorb water and minerals from the soil.
41
What is the source of sugar in a plant?
Answer
(C)
Leaves
42
What is the role of the cambium in vascular bundles?
Answer
(C)
To facilitate the growth of xylem and phloem.
43
What helps water molecules stick to each other in the xylem?
Answer
(B)
Cohesion
44
What is the function of the cuticle on a leaf?
Answer
(B)
To prevent water loss.
45
What is the purpose of the waxy cuticle found on the surface of leaves?
Answer
(C)
To reduce water loss
46
What is the primary role of stomata in a plant's life?
Answer
(C)
Exchanging gases
47
What are the products transported in the phloem?
Answer
(B)
Sugars and amino acids
48
What is the primary function of the phloem tissue?
Answer
(C)
To transport sugars and other organic molecules.
49
Which of the following correctly describes the role of the pholem in the transport of materials?
Answer
(B)
Transporting sugars from the leaves to other parts of the plant.
50
In which direction does water move through the xylem?
Answer
(B)
From roots to leaves.