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Photosynthesis

In this worksheet, students will explore what photosynthesis is and how a plant does it.

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 2 main sections. Stage 1 is when the green coloured substance - chlorophyll, found in the chloroplasts of plant cells - traps light. This light energy is used to break apart water to make just 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, organisms need oxygen to be able to do respiration, and so humans, animals and even plants use it again in respiration.

Once they have this, it then moves onto stage 2, where the hydrogen is combined with carbon dioxide to make glucose. Glucose provides energy for growth of the plant and it is also stored as starch for later use, 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 2 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.

What is the process used by plants to create their own energy? Type the word in the answer box below.

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? Select two boxes.

Oxygen

Hydrogen

Water

Soil

Carbon dioxide

Glucose

What are the products of photosynthesis? Select two boxes.

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? Type the word in the answer box below.

CORRECT ANSWER
photosynthesis
EDDIE SAYS
Plants make their own food for their growth with photosynthesis.
  • Question 2

What substance in green plants absorbs light?

CORRECT ANSWER
chlorophyll
EDDIE SAYS
Chlorophyll is the green pigment in green plants which 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? Select two boxes.

CORRECT ANSWER
Water
Carbon dioxide
EDDIE SAYS
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? Select two boxes.

CORRECT ANSWER
Oxygen
Glucose
EDDIE SAYS
Glucose and oxygen are produced during photosynthesis. Oxygen is a by-product, as it is not used by the plant. 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
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
Cellulose is made of glucose and is used to build new cell walls as the plant grows.
  • Question 7

What is the correct chemical formula for glucose? 

CORRECT ANSWER
C6H12O6
EDDIE SAYS
Remember, you need to know the chemical formula for all of them. Photosynthesis is the reaction of the devil because it is 6 water + 6 carbon dioxide makes 6 oxygen and glucose. All of the other numbers are either 6, 12 or 2.
  • Question 8

What is a waste product of photosynthesis? 

CORRECT ANSWER
Oxygen
EDDIE SAYS
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
All of the big numbers are 6's, that means that you need 6 water, 6 carbon dioxide and make 6 oxygen! Oh, and only one glucose...
  • Question 10

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

CORRECT ANSWER
Glucose
EDDIE SAYS
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.
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