1.6 The energy cycle of life 1HVTTO

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 2

1.6 The energy cycle of life

• Jacket in your locker
• Put your things on your desk

       Laptop/Book

       Notebook, pencil case

• Bag on the floor
  
• Read pages 23-24

Lessongoals

• Understand: I can describe the processes of respiration and photosynthesis and explain how they are linked.
• Apply: I can determine which organisms perform both respiration and photosynthesis and which ones perform only one of these processes

Homework 1.6

Asgmt 46-50 

A person is walking their dog.
The dog pees.
This is an example of

1. Movement
2. Respiration
3. Sensitivity
4. Excretion

In what organelle is food turned into energy? (1 word)

Which is the smallest level of organisation, where all 7 characteristics of life are still present?

1. Tissue
2. Cell
3. Molecule
4. Organelle

Which of these organelles is only found in plant cells?

1. Chloroplast
2. Nucleus
3. Mitochondrion
4. Cell wall

Why do plants have leaves?
What is their use?

Photosynthesis

water (H₂O) + carbon dioxide (CO₂) + sunlight -> glucose + oxygen (O₂)

oxygen

carbon dioxide

sunlight

Plants take up water using their roots. 

This is then tranported via the stems to green parts (mainly the leaves) of the plant where photosynthesis can happen

Carbon dioxide is a gas in the air. 

Plants can 'inhale' this into their bodies, allowing them to use it for photosynthesis

When the sun shines, plants can use the energy in it to perform photosynthesis

Oxygen is also created during photosynthesis. 

The plant releases this into the air, filling it with oxygen

The 3 words in front of the arrow are the ingredients needed for photosynthesis.

The 2 words behind the arrow are the result of photosynthesis.

The arrow is important, it shows that a chemical reaction is taking place.

In science, many substances have an abbreviation. 

It's easier to use these than writing the word:

H2O = water

CO2 = carbon dioxide

C6H12O6 = glucose (but you don't need to remember this one)

O2 = oxygen

glucose

Glucose (a type of sugar) is created during photosynthesis. 

It is an energy rich substance that the plant uses as its food

Photosynthesis happens in the chloroplasts of plant cells.

These are found in all the green parts of a plant

Cellular respiration

Turning food into energy

Glucose + Oxygen (O2) -> Water(H2O) + Carbon dioxide (CO2) + Energy

                                        

• Moving
• Bodyheat
• Growth
• etc.

Respiration happens inside the mitochondrion, a specialised organelle for this task.

Bacteria can do this without the need for mitochondria

The food organisms consume contains glucose. 

This glucose is used by mitochondria to perform respiration

The air organisms breathe contains oxygen (this is the entire reason you need to breathe), this oxygen is used in mitochondria to perform respiration

During respiration CO2 and H2O are created, these become a waste product. When organisms breathe, these gases are exhaled

The main reason for respiration is energy. 

This energy is then used for many different processes, nearly everything an organism does needs energy.

Think-Pair-Share

• Think: Work on the assignment on your own.
• Compare photosynthesis and respiration, write down: how are they similar and how are they different?

• Pair: Discuss and compare with your neighbour, improve your answer
• Share: Talk about given answers during plenary session.

Photosynthesis 

Energy from sunlight is put into glucose

Respiration

Energy from sunlight is released from glucose

oxygen

carbon dioxide

• Photosynthesis and respiration are opposite reactions. 
• Oxygen and carbon dioxide are constantly changed into each other because of these two processes.
• Respiration would be impossible without photosynthesis

What you should do: 1.6

• Tb: pages 23-24
• Wb: Asgmt 46-50
• Lt: Asgmt 1-5

Done with the above?

• Work on the next chapter(s)
• Learn for the test 
• Make other homework
• Read a book

Zs = Working in Silence

• No asking questions
• Silent, don't disturb anyone
  
• Stay at your  desk

What you should do: 1.6

• Tb: pages 23-24
• Wb: Asgmt 46-50
• Lt: Asgmt 1-5

Done with the above?

• Work on the next chapter(s)
• Learn for the test 
• Make other homework
• Read a book

Zw = Working with whispering

• Teacher is available for questions
• Only whisper with the student next to you
• Stay at your  desk

Plants perform both photosynthesis and respiration.
But not all the time.

Explain when, if and why these 2 processes stop in plants.

Tidy Duty

3 people each lesson

• Desks: empty and straight
• Chairs:  underneath the desks OR end of day: on the desks
• Floor: no rubbish