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Describe Active Transport

In this worksheet, students will 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.

Image of carrier proteins and active transport

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

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

Uses of Active Transport

 Image of villi in intestine

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 root hair cell

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. Plants are adapted to absorbing minerals by having root hair cells that have a large surface area as well as containing lots of mitochondria. Mitochondria is where energy is released during respiration. The energy is used to power active transport.

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

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 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

 

Image of root hair cell

It's at the roots that nitrates are absorbed via active transport. The image above shows a root hair cell. Root hair cells contain many mitochondria. How are root hair cells adapted for active transport?

Select one answer below.

 

Mitochondria provide energy for active transport

The root hair cell has a large surface area

Mitochondria act as a carrier protein

  • 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
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
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 moves 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 by active transport? Select one answer below.

 

CORRECT ANSWER
From the soil to root hair cell
EDDIE SAYS
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 into or out of cells.
  • Question 10
 

Image of root hair cell

It's at the roots that nitrates are absorbed via active transport. The image above shows a root hair cell. Root hair cells contain many mitochondria. How are root hair cells adapted for active transport?

Select one answer below.

 

CORRECT ANSWER
Mitochondria provide energy for active transport
EDDIE SAYS
Active transport requires energy and energy is released during respiration. This occurs at the mitochondria. Having mitochondria in the root hair cells allows the energy to be readily available for active transport.
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