CROSSROAD INTERNATIONAL LEARNING CENTRE
LESSON 4 – ACTIVE TRANSPORT
NAME
YEAR
SUBJECT
DATE
MARKS
/ 31
( Make sure to make your papers tidy as possible )
1. Which statement does not refer to active transport? ( 1 mark )
A. It requires energy.
B. Substances are moved from high to low concentrations.
C. Substances are moved against a concentration gradient.
D. It transports substances across a membrane.
2. Which methods involve the movement of substances down a concentration
gradient? ( 1 mark )
A. diffusion and osmosis
B. active transport and diffusion
C. osmosis and active transport
D. osmosis only
3. What do plants need to be healthy? How do they get these minerals? ( 4 marks )
1|Page
4. Write a definition for active transport. ( 2 marks )
You should include the terms:






Partially permeable membrane
Concentrated solution
Dilute solution
Substance
Concentration gradient
Energy
Active Transport -
5. In which organ of the digestive system does active transport of a substance occur?
( 2 marks )
6. Where does diffusion occur in mammals? ( 2 marks )
7. Name one place active transport is important in plants. ( 2 marks )
8. Place the following steps in the correct order. ( 5 marks )
Order
Statements
The concentration of glucose in the small intestine and in the bloodstream are
the same.
Glucose is transported from the small intestine into the bloodstream via active
transport, this requires energy.
Glucose moves by diffusion from the small intestine into the bloodstream.
Food is digested in the small intestine.
There is a higher concentration of glucose in the small intestine than in the
bloodstream.
2|Page
9. Active Transport in Plants
Plants require a plentiful supply of mineral ions, such as nitrate ions, to ensure healthy
growth. However, most mineral ions are found in low concentrations in ground soil. This
means there is already a higher concentration of mineral ions inside the plant than in the
surrounding soil. Therefore, plants cannot rely on mineral ions moving into the plant cells by
diffusion.
Mineral ions must be transported against a concentration gradient. Active transport ensures
that the required mineral ions are absorbed from the dilute solutions within the soil into the
root hair cells. This process requires energy.
Read the passage carefully which is provided for you and answer the following questions.
1. Explain why active transport is important in plants. ( 4 marks )
2. Explain why nitrate ions are transported from the soil into the root hair cell by active
transport and not by diffusion. ( 3 marks )
3|Page
3. Describe what is happening at each stage. ( 5 marks )
Complete the sentences using the words from the box below.
energy
original position
carrier
specific
cell membrane
4|Page