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The Importance of Green Plants

In this worksheet, students will look at the importance of green plants in our environment and the impact that the loss of green plants can have.

'The Importance of Green Plants' worksheet

Key stage:  KS 3

Curriculum topic:   Biology: Material Cycles and Energy

Curriculum subtopic:   Photosynthesis

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

Tree

 

Many people may look at the picture above and see a tree, but that's not all it is. This green plant plays a huge role in our lives, without us even realising it.

 

Green plants provide us with food. They are at the start of all food chains (see below) and are called producers as they can produce their own energy. Green plants provide us with fruits and vegetables and also feed other animals that we may then go on to eat.

 

 Food Chain

 
 
Photosynthesis

 

Green plants play a big role in our lives but play a bigger role in our environment. The equation below represents the process of photosynthesis:

 

Photosynthetic equation


From this equation, we can see that green plants provide our atmosphere with oxygen and use up carbon dioxide. The real importance of this is shown when we look at the equation for aerobic respiration.  
 
 
 
Aerobic Respiration

 

The equation below represents the process of aerobic respiration:

 

Respiration equation 


Respiration is the reverse reaction of photosynthesis which allows for the oxygen/carbon dioxide levels in the atmosphere to be kept constant.   
 

The Big CO2 Issue

 

The oxygen/carbon dioxide balance is extremely important, as carbon dioxide is a greenhouse gas. The ever-increasing world population has led to this balance being disturbed.

 

An increasing population means an increase in the need for housing, schools, hospitals, factories and, of course, farmland. For these to be built, areas of green land must be cleared, causing an increase in the amount of CO2 in the atmosphere. The increase in any greenhouse gas causes something known as The Greenhouse Effect and can lead to global warming.

 

The increasing population also means an increased demand for food and energy, leading to deforestation in order to clear the land needed for farming.

 

Keep these ideas in mind as we explore this activity.

In a food chain, what are green plants classed as?

producers

consumers

primary consumers

secondary consumers

The equation below represents which natural process?

 

aerobic respiration

photosynthesis

Green plants provide our atmosphere with which of the following gases? 

carbon dioxide

oxygen

nitrogen

argon

Which of the following gases is used up in photosynthesis? 

carbon dioxide

oxygen

nitrogen

argon

Which of the following gases is a 'greenhouse gas'? 

carbon dioxide

oxygen

nitrogen

argon

Complete the following sentence by writing the two missing words in the answer box below:

carbon dioxide

oxygen

nitrogen

argon

Which of the following will cause in increase in atmospheric CO2 levels?

increasing world population

burning fossil fuels

decreasing world population

planting more trees

deforestation

the increased use of solar power

The equation below represents photosynthesis.

 

 

 Where does the energy comes from?

the air

the sun

the ground

  • Question 1

In a food chain, what are green plants classed as?

CORRECT ANSWER
producers
EDDIE SAYS
Green plants are classed as producers, as they produce their own energy. Well, they convert sunlight energy into stored chemcial energy, but they are the only organisms on Earth that have that amazing ability. So, that means that they PRODUCE all the energy used in the food chain.
  • Question 2

The equation below represents which natural process?

 

CORRECT ANSWER
photosynthesis
EDDIE SAYS
The equation below represents the process of photosynthesis within green plants. Reactants: CO2 and H20 and then Products: glucose and oxygen. But the clever thing is the capturing of sunlight energy within the glucose molecule which makes that sugar a chemical energy store!
  • Question 3

Green plants provide our atmosphere with which of the following gases? 

CORRECT ANSWER
oxygen
EDDIE SAYS
During the day, green plants take in carbon dioxide and produce oxygen. Human beings and other living things need oxygen to survive, so green plants are extremely important, if only for this reason! Bear in mind that plants release CO2 when it's dark.
  • Question 4

Which of the following gases is used up in photosynthesis? 

CORRECT ANSWER
carbon dioxide
EDDIE SAYS
Green plants take in carbon dioxide during photosynthesis. Looking at the eqation, the carbon atoms form part of the structure of the sugars that are built during this process. As you'll learn, some of the oxygen atoms in CO2 are used in manufacturing sugar, others are released into the atmosphere.
  • Question 5

Which of the following gases is a 'greenhouse gas'? 

CORRECT ANSWER
carbon dioxide
EDDIE SAYS
Extra CO2 in the atmosphere means that less heat is reflected back into space from the Earth's surface, leading to a gradual increase in surface temperatures. Bear in mind, also, that methane (CH4) is over twenty times more powerful as a greenhouse gas and cattle produce a lot of methane!
  • Question 6

Complete the following sentence by writing the two missing words in the answer box below:

CORRECT ANSWER
EDDIE SAYS
The Greenhouse Effect is where the build-up of greenhouse gases is preventing the sun's heat and radiation from bouncing back out of the Earth's atmosphere, meaning that the planet is warming up.
  • Question 7

Which of the following will cause in increase in atmospheric CO2 levels?

CORRECT ANSWER
increasing world population
burning fossil fuels
deforestation
EDDIE SAYS
An increasing population means an increase in the need for housing, schools, hospitals and factories. For these to be built, areas of green land must be cleared, causing an increase in the amount of carbon dioxide in the atmosphere. The increasing population also means an increased demand for food and energy leading to deforestation.
  • Question 8

The equation below represents photosynthesis.

 

 

 Where does the energy comes from?

CORRECT ANSWER
the sun
EDDIE SAYS
The Sun provides the energy needed for photosynthesis. Think of it this way: the sugars built in the leaves through photosynthesis locks sunlight energy into the sugars' structure. That means that whatever eats that leaf (you?) receives that energy from the sun, which can be used for growing, or for keeping warm, or for activity. Plants are amazing!
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