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Describe the Process of Photosynthesis

Worksheet Overview

QUESTION 1 of 10

Virtually everything we eat can be traced back to plants. Either we eat food from plants or we eat food from animals, that in turn have eaten plants. How do plants get their food then? Let's find out the answer to this question below.

Image of photosynthesis

Plants use sunlight to make their own food, this process is called photosynthesis. Plants have a special green pigment called chlorophyll that traps sunlight. The chlorophyll is found in a structure called chloroplast which is found in plant cells; these are mainly found in the leaf.

Photosynthesis is an endothermic reaction because light energy is absorbed by the plant to power photosynthesis.  Enzymes speed up this process, without enzymes the reactions in photosynthesis would happen really slowly. Water and carbon dioxide are also essential for photosynthesis; water is absorbed by root hair cells in the plant's rootsCarbon dioxide is present in the atmosphere and enters the leaf of a plant through small pores called stomata (or stoma when we're talking about just one). 

Image of leaf anatomy

Photosynthesis can be broken up into two main stages

First Stage: Light energy is used to split water into oxygen gas and hydrogen. The oxygen is released into the atmosphere.

Second Stage: The hydrogen is combined with the carbon dioxide taken in from the atmosphere to make glucose. 

The table below summarises the inputs (what is taken in) and outputs (what is released or produced) from each stage of photosynthesis:

 Stage of Photosynthesis  Input  Output
First Stage

Light

Chlorophyll (structure)

Water

Oxygen

Hydrogen

Second Stage

Hydrogen

Carbon Dioxide

 

Glucose

The glucose made by photosynthesis is used for many processes:

  • Provides energy for respiration
  • To make cellulose, the main structural material in cell walls
  • Used to turn sugars, nitrates & other nutrients into amino acids which build up proteins
  • Stored as starch (in leaves, seeds, roots and tubers)
  • Used to make fats & oils (energy stored in seeds)

In the following activity, you will describe the process of photosynthesis.

 

Photosynthesis can be illustrated using an equation.

The word equation for photosynthesis is:

Carbon dioxide + Water → Glucose + X

What is X? Type your answer below, using one word only

 

 

 

Photosynthesis occurs in two stages

Describe the two stages by filling in the blanks below.

 

Why is photosynthesis regarded as an endothermic process? Select one answer.

 

 

Energy is broken down during photosynthesis

Energy is taken in during photosynthesis

Energy is released during photosynthesis

Glucose from photosynthesis can be used in many different processes. Describe these processes by matching up the sentences below.

 

 

 

 

Column A

Column B

Used to make cellulose which is...
...for respiration
Stored as starch for example in...
...leaves, seeds, roots and tubers
Used to turn sugars and nitrates...
...the main structural material in cell walls
Provides an energy source...
...and oils often stored in seeds
Used to make fats...
...into amino acids which build up proteins provi...

What are some of the inputs and outputs of the first stage of photosynthesis? Select one answer in each row.

Tim is growing cress. He is trying to explain to Rosie why placing his cress in sunlight will allow it to grow. Help Tim explain why light is needed for his cress to grow. Select two answers.

Light energy is needed for photosynthesis, to split water into oxygen and hydrogen

Light energy is needed for respirationr

Hydrogen is combined with carbon dioxide to produce glucose, helping the cress to grow

Oxygen is used for growth

Finish off the word equation for photosynthesis. Select one answer in each row. 

Image of word equation of photosynthesis

 ABC
Oxygen
Water
Chlorophyll
Which structure is needed for photosynthesis to occur and without, reactions would occur very slowly?
 Select one answer below.
Root hair cells

Chlorophyll

Enzymes

Image of leaf anatomy  

The image above shows the structure of a leaf. What is the name of structure X that allows carbon dioxide and oxygen to enter and leave the plant? Type one answer below. 

Match up the definitions to the keywords below.

Column A

Column B

The storage carbohydrate found in plants.
Oxygen
The process where plants use sunlight to make glu...
Light
The gas produced during photosynthesis.
Starch
The source of energy needed by plants for photosy...
Water
The gas needed by plants for photosynthesis.
Glucose
The sugar made by plants during photosynthesis.
Photosynthesis
The liquid needed by plants for photosynthesis.
Carbon Dioxide
  • Question 1

Photosynthesis can be illustrated using an equation.

The word equation for photosynthesis is:

Carbon dioxide + Water → Glucose + X

What is X? Type your answer below, using one word only

 

 

 

CORRECT ANSWER
Oxygen
EDDIE SAYS
Oxygen is one of the main waste products of photosynthesis. This oxygen is essential for animals and any microorganisms that use oxygen for respiration
  • Question 2

Photosynthesis occurs in two stages

Describe the two stages by filling in the blanks below.

 

CORRECT ANSWER
EDDIE SAYS
During photosynthesis, many reactions occur but are summarised into two main stages. Remember, the gases oxygen and carbon dioxide are taken in through pores called stomata found in the leaves of the plant.
  • Question 3

Why is photosynthesis regarded as an endothermic process? Select one answer.

 

 

CORRECT ANSWER
Energy is taken in during photosynthesis
EDDIE SAYS
Light energy is absorbed by chlorophyll in order to start off the process of photosynthesis.
  • Question 4

Glucose from photosynthesis can be used in many different processes. Describe these processes by matching up the sentences below.

 

 

 

 

CORRECT ANSWER

Column A

Column B

Used to make cellulose which is.....
...the main structural material i...
Stored as starch for example in.....
...leaves, seeds, roots and tuber...
Used to turn sugars and nitrates....
...into amino acids which build u...
Provides an energy source...
...for respiration
Used to make fats...
...and oils often stored in seeds
EDDIE SAYS
Have a go at this question a few times to consolidate your knowledge, the uses of glucose often come up in exams!
  • Question 5

What are some of the inputs and outputs of the first stage of photosynthesis? Select one answer in each row.

CORRECT ANSWER
EDDIE SAYS
In the first stage of photosynthesis, water is split up by light to produce oxygen and hydrogen. Water → Oxygen + Hydrogen
  • Question 6

Tim is growing cress. He is trying to explain to Rosie why placing his cress in sunlight will allow it to grow. Help Tim explain why light is needed for his cress to grow. Select two answers.

CORRECT ANSWER
Light energy is needed for photosynthesis, to split water into oxygen and hydrogen
Hydrogen is combined with carbon dioxide to produce glucose, helping the cress to grow
EDDIE SAYS
Light energy is needed to start off the process of photosynthesis, without this energy, the first stage of photosynthesis can't happen.
  • Question 7

Finish off the word equation for photosynthesis. Select one answer in each row. 

Image of word equation of photosynthesis

CORRECT ANSWER
 ABC
Oxygen
Water
Chlorophyll
EDDIE SAYS
Chlorophyll is not a reactant but it's essential for the reactions of photosynthesis to go ahead which is why it is sometimes found in equations. It's not always featured in equations though!
  • Question 8
Which structure is needed for photosynthesis to occur and without, reactions would occur very slowly?
 Select one answer below.
CORRECT ANSWER
Enzymes
EDDIE SAYS
Enzymes are catalysts that speed up reactions. Enzymes are needed for the chemical reactions in photosynthesis to occur and without them would happen very slowly.
  • Question 9

Image of leaf anatomy  

The image above shows the structure of a leaf. What is the name of structure X that allows carbon dioxide and oxygen to enter and leave the plant? Type one answer below. 

CORRECT ANSWER
Stomata
Stoma
EDDIE SAYS
The stomata are pores that allow gas exchange to occur, they are normally surrounded by cells called guard cells that open and close, controlling which gases enter or exit the leaf.
  • Question 10

Match up the definitions to the keywords below.

CORRECT ANSWER

Column A

Column B

The storage carbohydrate found in...
Starch
The process where plants use sun...
Photosynthesis
The gas produced during photosyn...
Oxygen
The source of energy needed by p...
Light
The gas needed by plants for pho...
Carbon Dioxide
The sugar made by plants during p...
Glucose
The liquid needed by plants for ...
Water
EDDIE SAYS
A quick summary activity to test your knowledge of the key terms found in this topic. Have a few go's if you didn't manage to get them all correct the first time round!
---- OR ----

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