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Understand Photosynthesis

Worksheet Overview

QUESTION 1 of 10

Plants need to eat as well! But there is a problem - plants can’t move around to find their food like most animals can. To get around this, they have developed a way of making their own food called photosynthesis.

 

So how do they do it? Well, it’s two main stages. Stage one is when the green substance, chlorophyll ( found in the chloroplasts of plant cells), traps light. This light energy is used to break apart water to make hydrogen and oxygen (because water is made of hydrogen and oxygen!). The oxygen is spat out as a waste product because it is not needed by the plant. However,  humans, animals and even plants will reuse that oxygen in respiration since organisms require oxygen for that process.

Once the water has split and created hydrogen, it then moves onto stage two, where the hydrogen is combined with carbon dioxide to make glucose. Glucose provides energy for the growth of the plant and it is also stored as starch for later use. This is possible because starch does not dissolve in water. 

 

So you need to know the word equation. Seriously – they ask you to fill in the blanks and it can be worth two marks – remember it!

 

 

You also need to know the balanced symbol equation for photosynthesis - are you ready?

 

6CO2 + 6H2O -> C6H12O6 + 6CO2

 

In order for plants to grow, glucose is turned into cellulose to make new cell walls. Vegetable fats and oils are also made of glucose and stored for future use. We extract them from plants and use them for cooking.

 

There's some complicated stuff to remember here but it is important to try to learn it. Now let's move on to some questions.

What is the process used by plants to create their own energy? 

What substance in green plants absorbs light?

Cell membrane

Chloroplasts

Chlorophyll

What are the reactants (things that are needed to do the reaction) of photosynthesis? 

Oxygen

Hydrogen

Water

Soil

Carbon dioxide

Glucose

What are the products of photosynthesis? 

Oxygen

Hydrogen

Water

Soil

Carbon dioxide

Glucose

What do plant cells have that cannot be found in animals cells?

A nucleus

A cell membrane

Chloroplasts

What substance is made of glucose and is used to build new cell walls in the growing plant?

Chlorophyll

Cellulose

Chloroplasts

What is the correct chemical formula for glucose? 

C6H12O6

C6H6O6

C6H12C2

What is a waste product of photosynthesis? 

Glucose

Carbon dioxide

Oxygen

How many molecules of water are needed for photosynthesis?

2

6

12

What is the name of the useful product made in photosynthesis?

Hydrogen Dioxide

Glucose

Oxygen

  • Question 1

What is the process used by plants to create their own energy? 

CORRECT ANSWER
photosynthesis
EDDIE SAYS
Hopefully, you knew the answer to this one - if you got it wrong, maybe it was an issue with the spelling. Look carefully to make sure you've got it sorted. Plants make their own food for growth by photosynthesis.
  • Question 2

What substance in green plants absorbs light?

CORRECT ANSWER
Chlorophyll
EDDIE SAYS
Chlorophyll is the green pigment in green plants that absorbs the energy from light that is necessary for photosynthesis to take place. Chlorophyll is in the chloroplasts - don't get them confused!
  • Question 3

What are the reactants (things that are needed to do the reaction) of photosynthesis? 

CORRECT ANSWER
Water
Carbon dioxide
EDDIE SAYS
There were loads to choose from here but only two were correct answers. Did you remember back to the word equation in the Introduction? The reactants of any chemical equation come before the arrow. Carbon dioxide and water are the reactants of photosynthesis, and glucose and oxygen are the products.
  • Question 4

What are the products of photosynthesis? 

CORRECT ANSWER
Oxygen
Glucose
EDDIE SAYS
The products of something are the things that are produced (or created) in a process. Think back to that word equation in the Introduction - what is produced in the process of photosynthesis? The answer is glucose and oxygen, so there were two correct options to tick. Oxygen is a by-product, as it is not used by the plant, but glucose provides the plant with energy for growth, as well as being stored for later use.
  • Question 5

What do plant cells have that cannot be found in animals cells?

CORRECT ANSWER
Chloroplasts
EDDIE SAYS
There are several things that plant cells have that are not found in animal cells but the correct answer is the third option. Plant cells have organelles called chloroplasts, which are used for photosynthesis. Photosynthesis is a process which only occurs in green plants. Plant and animal cells both have a nucleus and a cell membrane.
  • Question 6

What substance is made of glucose and is used to build new cell walls in the growing plant?

CORRECT ANSWER
Cellulose
EDDIE SAYS
Did you get this one - we've already spent a few questions looking at the role of chlorophyll and the chloroplasts so this was a bit of a clue to it being neither of them as the correct answer! Cellulose is made of glucose and is used to build new cell walls as the plant grows. The cellulose cell walls are another feature that are unique to plant cells and never found in animal cells.
  • Question 7

What is the correct chemical formula for glucose? 

CORRECT ANSWER
C6H12O6
EDDIE SAYS
This was a big challenge but don't despair - the more often you have to write it, the easier it will be to remember it - and you need to know it! You need to know the chemical formula for each of the components of the equation and glucose is the key element because it is all those 6s and 12s that make the rest of the equation so hard to balance. Here's the formula for glucose again - try to learn it! C6H12O6
  • Question 8

What is a waste product of photosynthesis? 

CORRECT ANSWER
Oxygen
EDDIE SAYS
How did you do with this one? Carbon dioxide is used for photosynthesis so that couldn't be the right answer. The plant does produce glucose but this is the whole point of the process of photosynthesis so this is hardly a waste product!! So the correct answer is oxygen. While oxygen is used for respiration, it is not needed for photosynthesis and so we call it a waste product.
  • Question 9

How many molecules of water are needed for photosynthesis?

CORRECT ANSWER
6
EDDIE SAYS
Did this one catch you out? All it is asking is what is the number that is placed in front of water in the balanced equation? Think back to that all-important equation - all of the big numbers are 6's, so that means that you need 6 water and 6 carbon dioxide and it will make 6 oxygen! Oh, and only one glucose... So the answer is 6 molecules of water are needed.
  • Question 10

What is the name of the useful product made in photosynthesis?

CORRECT ANSWER
Glucose
EDDIE SAYS
We've already sorted out that there are two products created in photosynthesis and one of them is a waste product - oxygen. So that leaves us with the other one - glucose! The plant needs to make food - food is essentially glucose (although humans need more than just glucose to survive). Without glucose, the plant cannot do a lot of the processes it needs to survive so it needs to make a large store of it through photosynthesis. Well done for completing this activity. Make sure you've learned that chemical formula before you move on!
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