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Growing Plants

In this worksheet, students will be helped to understand how plants get food and to explain the chemical processes involved in the growth of plants.

'Growing Plants' worksheet

Key stage:  KS 3

Curriculum topic:   Biology: Material Cycles and Energy

Curriculum subtopic:   Photosynthesis

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

How do plants grow?

What do you need to grow a plant? A seed, soil, water… anything else?

Humans get their energy from the food that we eat, but plants don’t eat food, so where do they get their energy from?

Many people think that plants get their food from the soil but that’s not the case.  Plants can actually make their own food through a chemical process called photosynthesis.

 

What is photosynthesis?

If you break down the word it explains itself. Photo- means light and -synthesis means to make, therefore photosynthesis is the process of using light energy to produce food.

 

What is needed for photosynthesis?

The two raw materials needed for photosynthesis to take place are water and carbon dioxide.

Photosynthesis picture

 

The water comes from the soil and is absorbed into the plant through the long roots.

The carbon dioxide comes from the air and is absorbed into the plants through tiny holes in the leaves called stomata.

 

Stomata

 

The other thing needed for photosynthesis to take place is light energy. Where do you think this light energy comes from?

The light energy is changed into chemical energy by the green pigment in the leaves called chlorophyll.

 

What is produced?

The food made during photosynthesis is called glucose (sugar). This glucose can then be stored in the plant as starch.

The other product of photosynthesis is oxygen which is released from the plant through the stomata in the leaves.

 

Is photosynthesis important?

If you're reading this, then you're alive and you're alive because of photosynthesis!  It provides ALL your food and ALL your oxygen.  There's oxygen in the atmosphere because it's a waste product of this process and since photosynthetic plants are at the base of pretty much every food chain, the sun energy they lock into the sugars they make feeds everything.  Is it important?  Just slightly!

 

The equation

All of this information can be simplified into a short equation:

Photosynthesis equation
 
 
This equation can be read as ‘carbon dioxide and water, in the presence of light energy and chlorophyll, produces oxygen and glucose’.

Which of the following is not required for photosynthesis to take place?

water

chlorophyll

light energy

carbon dioxide

oxygen

Which of the following living things can create food energy through photosynthesis?

green plants

animals

bacteria

humans

Complete the following equation for photosynthesis:

 

 

Remember to write your answers in lower case.

 

 ABC
Answer

Light energy is required for photosynthesis to take place. Where does this light energy come from?

the moon

street lights

a torch

the sun

What is the role of the roots in photosynthesis?

to absorb carbon dioxide

to absorb soil

to absorb water

to absorb light energy

Which part of the plant allows in carbon dioxide and gives out oxygen?

stem

stomata

chlorophyll

roots

Which of the following are the raw materials needed for photosynthesis?

 

Tick two boxes.

oxygen

water

light energy

carbon dioxide

glucose

chlorophyll

Match up the following plant components with their function.

 RootsStomataChlorophyll
Used to convert light energy into chemical energy
Absorbs water from the soil
Allows in carbon dioxide from the air

What would you expect to happen to the carbon dioxide levels in the air at night compared to during the day?

Carbon dioxide levels would increase.

Carbon dioxide levels would decrease.

A simple experiment can be done using an Elodea plant (Canadian pondweed) to prove that oxygen is produced during photosynthesis.  Here is the apparatus:

 

Pndweed producing oxygen

 

When the Elodea plant is placed in water in front of a light source, bubbles of gas are produced and can be collected.

 

How could you test this gas to prove that it is oxygen?

 

The gas will........

burn with a squeaky pop.

relight a glowing splint.

turn lime water milky/cloudy.

  • Question 1

Which of the following is not required for photosynthesis to take place?

CORRECT ANSWER
oxygen
EDDIE SAYS
Plants use chlorophyll to combine carbon dioxide and water, using the energy of light, to produce sugar and oxygen during photosynthesis.
  • Question 2

Which of the following living things can create food energy through photosynthesis?

CORRECT ANSWER
green plants
EDDIE SAYS
Only green plants are able to photosynthesise, so they are the only organisms able to create the chemical energy of sugar (food) through this process.
  • Question 3

Complete the following equation for photosynthesis:

 

 

Remember to write your answers in lower case.

 

CORRECT ANSWER
 ABC
Answer
EDDIE SAYS
This equation can be read as ‘carbon dioxide and water, in the presence of light energy and chlorophyll, produces oxygen and glucose’. Chlorophyll is a real tough one to spell - pronouncing it as CLAW-ROW-FILL, you can break it down into CHLOR, then O, then PHYLL when writing it down.
  • Question 4

Light energy is required for photosynthesis to take place. Where does this light energy come from?

CORRECT ANSWER
the sun
EDDIE SAYS
The sun provides the light energy required for photosynthesis to take place. To honest, any light will do, but the Earth's light, for 99.9% of it's history, has been solely produced by the sun. Only recently has mankind been making its own light. By the way, moonlight is reflected light and of no use for photosynthesis.
  • Question 5

What is the role of the roots in photosynthesis?

CORRECT ANSWER
to absorb water
EDDIE SAYS
The water required for photosynthesis is absorbed through the roots.
  • Question 6

Which part of the plant allows in carbon dioxide and gives out oxygen?

CORRECT ANSWER
stomata
EDDIE SAYS
The stomata are tiny holes on the surface of the leaves which allows carbon dioxide to be used in photsynthesis and for oxygen to be released.
  • Question 7

Which of the following are the raw materials needed for photosynthesis?

 

Tick two boxes.

CORRECT ANSWER
water
carbon dioxide
EDDIE SAYS
Are you getting this OK? The two raw materials in photosynthesis are water and carbon dioxide. They are then combined together to make both sugar (glucose) and oxygen.
  • Question 8

Match up the following plant components with their function.

CORRECT ANSWER
 RootsStomataChlorophyll
Used to convert light energy into chemical energy
Absorbs water from the soil
Allows in carbon dioxide from the air
EDDIE SAYS
So, stomata are tiny holes that open and close to allow exchange of gases between the plant and the air. The chlorophyll is the vital chemical that enables carbon dioxide and water to be combined into glucose and oxygen. Finally, the water for loads of plant functions is taken into the plant through the roots.
  • Question 9

What would you expect to happen to the carbon dioxide levels in the air at night compared to during the day?

CORRECT ANSWER
Carbon dioxide levels would increase.
EDDIE SAYS
The carbon dioxide levels in the air increase at night as two factors are at play: photosynthesis can only take place in the presence of sunlight, so no carbon dioxide is being taken in by the plant and, in additon, the gas is a product of respiration so is being released into the air as the plant respires.
  • Question 10

A simple experiment can be done using an Elodea plant (Canadian pondweed) to prove that oxygen is produced during photosynthesis.  Here is the apparatus:

 

Pndweed producing oxygen

 

When the Elodea plant is placed in water in front of a light source, bubbles of gas are produced and can be collected.

 

How could you test this gas to prove that it is oxygen?

 

The gas will........

CORRECT ANSWER
relight a glowing splint.
EDDIE SAYS
The test for oxygen is that it will relight a glowing splint. The squeaky pop one is hydrogen and the cloudy limewater one is carbon dioxide.
---- OR ----

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