Question 1
Question 1(b)
(a)
Explain why active transport is important in root hair cells.
[ 3 ]
IGCSE Biology 3.3 Active transport Question Bank
Question 1
[Maximum number: 3]
Fig. 1.1 shows several villi from the ileum, which is part of the small intestine.
Question 1(b)
(a)
Fig. 1.2 shows the tip of a villus in more detail.
Fig. 1.2
The epithelial cells of the villi absorb nutrients by diffusion and active transport.
[ 3 ]
Question 1(b)(i)
(i)
Describe how active transport differs from diffusion.
[ 3 ]
Question 5
[Maximum number: 1]
Some examples of substances moving across membranes are listed.
1 glucose molecules into the epithelium that lines the small intestine
2 nitrate ions from a dilute solution in soil into a more concentrated solution in root hair cells
3 water molecules from mesophyll cells into the air spaces of a leaf
For which examples must oxygen be present?
A
1, 2 and 3
B
1 and 2 only
C
1 and 3 only
D
2 and 3 only
Question 6
[Maximum number: 1]
Which process requires energy from respiration?
A
active transport
B
diffusion
C
osmosis
D
transpiration
Question 6
[Maximum number: 1]
The diagram shows the movement of glucose molecules across a cell membrane.
Which statement describes molecule T?
A
It is a fat molecule used to transport glucose down a concentration gradient.
B
It is a fat molecule used to transport glucose against a concentration gradient.
C
It is a protein molecule used to transport glucose down a concentration gradient.
D
It is a protein molecule used to transport glucose against a concentration gradient.
Question 6
[Maximum number: 1]
Which diagram represents active transport?
C
does not require energy from respiration
D
does not require energy from respiration
Question 6
[Maximum number: 1]
Which is an example of active transport?
A
carbon dioxide entering a leaf
B
ion uptake by root hair cells
C
oxygen moving from the alveoli into the blood
D
water uptake by root hair cells
Question 6
[Maximum number: 1]
Which process is involved in the uptake of glucose by the epithelial cells of kidney tubules?
A
active transport
B
diffusion
C
osmosis
D
transpiration
Question 6
[Maximum number: 1]
Which statement describes active transport?
A
the movement of ions through proteins in a cell membrane, releasing energy
B
the movement of ions through proteins in a cell membrane, using energy
C
the movement of water through lipids in a cell membrane, releasing energy
D
the movement of water through lipids in a cell membrane, using energy
Question 6
[Maximum number: 1]
Which statement about diffusion is correct?
A
The process requires energy from respiration.
B
The particles must cross a cell membrane.
C
The net movement of particles is up a concentration gradient.
D
The process involves the random movement of particles.