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Describe Active Transport

Worksheet Overview

QUESTION 1 of 10

Active transport is the movement of substances from an area of low concentration to a higher concentration, either into or out of cells.

During active transport, carriers in the cell membrane ‘pick up’ particles and move them against the concentration gradient.

 

Image of carrier proteins and active transport

 

As the name suggests, active transport requires energy from the cell, which is made available by respiration.

 

Uses of Active Transport

During digestion, the villi in the small intestine absorb the nutrients from our digested food. Over time, the concentration of nutrients in the villi is equal with the concentration in the gut. The cells need these nutrients, so active transport is used to continue the transport of the small amounts of remaining nutrients. 

Image of villi in intestine

 

Plants need to absorb minerals such as nitrogen, phosphorus and potassium from the soil for healthy growth. When the concentration of minerals in the soil is lower than inside the plant, active transport is used to absorb the minerals against the concentration gradient. If plants used diffusion instead of active transport, the plants would be drained of all their minerals because they would travel down the concentration gradient.

Image of root hair cell

 

In the following activity, you will describe active transport. 

Plant and animal cells use active transport to transport important nutrients into their cells. 

 

Describe active transport. Fill in the blanks below to answer this question.

 

What is a carrier protein and where is it found? Select two answers. 

Allows all substances to pass through

Selects specific particles to pass through

It is found only in plant cell walls

It is found in the cell membrane

What is essential for active transport to occur? 

Type your answer below. 

What is meant by ‘against the concentration gradient’?

Select one answer below.

 

 

From low to high concentration

From high to low concentration

No net movement

Image of plant and roots

Nitrates are minerals absorbed by root hair cells in plants. The nitrate ions will often move from a lower concentration in the soil to a higher concentration in the plant.

 

Why do plants need nitrates? Select one answer below.

 

To make proteins for growth

For photosynthesis

To respire

Glucose molecules can be absorbed from the intestines into the blood by active transport.

 

Why is active transport needed? Select two answers below.

The concentration of glucose is higher in the intestines than in the blood

The concentration of glucose is lower in the intestines than in the blood

Active transport is needed to move the glucose molecules down the concentration gradient

Active transport is needed to move the glucose molecules against the concentration gradient

Plants need important nutrients, such as nitrates, in order to grow.

 

Match up the sentences describing how active transport helps plants get the nutrients they need.

Column A

Column B

The concentration of minerals in the soil is very ...
...in water and move around the soil in solution
Root hair cells are adapted to absorb the water ou...
...them into the cell against the concentration gr...
Minerals such as nitrate ions can't be absorbed by...
...diffusion (because the minerals are in very low...
The root hair cells have carrier molecules on thei...
...surface area and thin walls
 

Image of nitrates taken up by active transport

The diagram above shows molecules of nitrates in the soil. There are two molecules of nitrates in the soil and four molecules of nitrates in the root hair cell of a plant.

 

Which direction will the nitrates move in by active transport? Select one answer below.

 

From the soil to root hair cell

From the root hair cell to the soil

No movement

Image of carrier protein in active transport

The image above shows the process of active transport. Label arrow X. Select one answer below.

Carrier protein

Cell wall

Nucleus

What are some of the differences between osmosis and active transport? Select one answer in each row.

Image of carrier proteins and active transport     Image of particles moving via osmosis

  • Question 1

Plant and animal cells use active transport to transport important nutrients into their cells. 

 

Describe active transport. Fill in the blanks below to answer this question.

 

CORRECT ANSWER
EDDIE SAYS
How did you do? Active transport is really important for cells - they're able to get the substances they need for different processes, like digestion. Active transport ensures that substances are absorbed regardless of concentration.
  • Question 2

What is a carrier protein and where is it found? Select two answers. 

CORRECT ANSWER
Selects specific particles to pass through
It is found in the cell membrane
EDDIE SAYS
Carrier proteins are found in the cell membrane and have a specific shape that will only let specific particles through. A little like a lock and key.
  • Question 3

What is essential for active transport to occur? 

Type your answer below. 

CORRECT ANSWER
energy
EDDIE SAYS
Without energy, active transport cannot occur. Diffusion and osmosis, however, are passive, so no energy is needed.
  • Question 4

What is meant by ‘against the concentration gradient’?

Select one answer below.

 

 

CORRECT ANSWER
From low to high concentration
EDDIE SAYS
Good job if you chose the first option! Particles will normally move from a high to low concentration - this is passive. In active transport, it's the opposite way round and is only possible because of the energy available to do this.
  • Question 5

Image of plant and roots

Nitrates are minerals absorbed by root hair cells in plants. The nitrate ions will often move from a lower concentration in the soil to a higher concentration in the plant.

 

Why do plants need nitrates? Select one answer below.

 

CORRECT ANSWER
To make proteins for growth
EDDIE SAYS
Nitrates are needed to make amino acids and proteins. These are absorbed against the concentration gradient by active transport.
  • Question 6

Glucose molecules can be absorbed from the intestines into the blood by active transport.

 

Why is active transport needed? Select two answers below.

CORRECT ANSWER
The concentration of glucose is lower in the intestines than in the blood
Active transport is needed to move the glucose molecules against the concentration gradient
EDDIE SAYS
Even if there isn't much glucose in the intestines, the glucose will still be transported against the concentration gradient into the blood through active transport. This is because our cells need important substances like glucose for respiration.
  • Question 7

Plants need important nutrients, such as nitrates, in order to grow.

 

Match up the sentences describing how active transport helps plants get the nutrients they need.

CORRECT ANSWER

Column A

Column B

The concentration of minerals in ...
...in water and move around the s...
Root hair cells are adapted to ab...
...surface area and thin walls
Minerals such as nitrate ions can...
...diffusion (because the mineral...
The root hair cells have carrier ...
...them into the cell against the...
EDDIE SAYS
With osmosis and diffusion, particles move from a higher concentration to a lower concentration. With active transport, it is the opposite - from a lower concentration to a higher concentration.
  • Question 8
 

Image of nitrates taken up by active transport

The diagram above shows molecules of nitrates in the soil. There are two molecules of nitrates in the soil and four molecules of nitrates in the root hair cell of a plant.

 

Which direction will the nitrates move in by active transport? Select one answer below.

 

CORRECT ANSWER
From the soil to root hair cell
EDDIE SAYS
Is this getting easier? Remember, active transport is the movement from low --> high concentrations.
  • Question 9

Image of carrier protein in active transport

The image above shows the process of active transport. Label arrow X. Select one answer below.

CORRECT ANSWER
Carrier protein
EDDIE SAYS
The carrier protein is essential for active transport. Without it, substances can't travel in or out of cells.
  • Question 10

What are some of the differences between osmosis and active transport? Select one answer in each row.

Image of carrier proteins and active transport     Image of particles moving via osmosis

CORRECT ANSWER
EDDIE SAYS
Osmosis and active transport are almost opposite processes, in that one is passive (osmosis) and the other needs energy (active transport). Remembering one process will hopefully help you to remember the other for your exams! Practice makes perfect! That’s another activity ticked off.
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