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Photosynthesis and respiration C/W Date:…………………… Photosynthesis and respiration Lesson Objectives To describe what plants use glucose for. To explain the differences between photosynthesis and respiration in plants. Success Criteria Define dependent and independent. What can glucose be converted into. Define respiration

Photosynthesis Carbon Dioxide + Water Oxygen + Glucose Sunlight Photosynthesis - Clip

What do the plants use glucose (made by photosynthesis) for?

glucose What do plants with the glucose made by photosynthesis? Some glucose is used straight away in respiration. Plants also carry out respiration to release the energy they need for life processes. glucose Some glucose is converted into starch and other substances for storage. These stores of energy can be used later when the plant needs them. Some glucose is used to make new chemicals such as proteins, sugars and fats that the plant also needs to function properly.

Glucose Starch Proteins Cellulose Fats and Oils Used to make some glues and foam packaging. Used to make some biodegradable plastics Starch Proteins Nitrogen from nitrates Glucose Cellulose Fats and Oils Used in many perfumes, lubricant, paints and varnishes Used to make paper

What new materials can you make from glucose? P………….. Nitrogen from nitrates Glucose C…………… F…. and O….. Used in many perfumes, lubricant, paints and varnishes Used to make paper

Investigating plants to find out what part contains the most sugar? Carry out food tests on different parts of the plant. Try to test carrot, onion, potato and different seeds. Investigation 12.7 Biology for You new edition ‘Food Plants’. Alternatively complete the practical ‘Investigating plants to find out what part contains the most sugar?’

Starch in plants Aim: To investigate which foods contain starch.

Starch in plants Results Conclusion

glucose What do plants with the glucose made by photosynthesis? Some glucose is used straight away in respiration. Plants also carry out respiration to release the energy they need for life processes. glucose Some glucose is converted into starch and other substances for storage. These stores of energy can be used later when the plant needs them. Some glucose is used to make new chemicals such as proteins, sugars and fats that the plant also needs to function properly.

What is photosynthesis? light energy chlorophyll carbon dioxide +  water oxygen glucose What is the symbol equation for this reaction? light energy 6 CO2 + 6 H2O +  C6H12O2 6 O2 chlorophyll Is this a balanced symbol equation? How would you balance the equation?

What is respiration? Video

from the digestive system from the breathing system What is respiration? Respiration is the process that the body uses to release energy from digested food (glucose): energy oxygen water glucose carbon dioxide from the digestive system from the breathing system useful! waste product exhaled This type of respiration is called aerobic respiration because energy is released with oxygen.

Plants as Food How?? GLUCOSE can be used by the plant in…………………………… Respiration = plants release energy from glucose Glucose is converted into starch = Storage Glucose is used to make new substances.

Describe what is being shown in the diagram in few sentences…..?

release the energy they need for life processes. Photosynthesis and respiration What do plants use glucose (made by photosynthesis) for? Video Time What is needed and made in cellular respiration? Where does respiration happen? Where does the glucose come from for respiration in plants? 4. Where is chlorophyll found in a plant and what does it do? Some glucose is used straight away in respiration. Plants also carry out respiration to release the energy they need for life processes. glucose Some glucose is converted into starch and other substances for storage. These stores of energy can be used later when the plant needs them. Some glucose is used to make new chemicals such as proteins, sugars and fats that the plant also needs to function properly.

Photosynthesis or Respiration?? Video Questions All living things get the energy they need to live from a chemical reaction called respiration. Living cells respire. Aerobic respiration is the chemical reaction used to release energy from glucose. glucose + oxygen → carbon dioxide + water (+ energy) Notice that the word equation for respiration is the reverse of the word equation for photosynthesis.

Bright Sunlight Carbon Dioxide Oxygen Respiration always takes place. However, more oxygen is produced by Photosynthesis than is used by Respiration.

Dim Sunlight Oxygen Carbon Dioxide Respiration still takes place. This time the SAME amount of oxygen is produced by Photosynthesis that is used by Respiration.

Darkness Respiration still takes place. Photosynthesis does not occur as there is no light. No oxygen is produced.

Photosynthesis v Respiration Biology for You new edition Experiment 12.15 ‘Photosynthesis and respiration’. This can either be done as a class practical or a demo. There is also very good diagram on this page 192.

Is respiration taking place? Tube 1 = Dark / Leaf / Hydrogen carbonate indicator Tube 2= Light / leaf/ Hydrogen carbonate indicator Tube 3 = Light / no leaf/ Hydrogen carbonate indicator Carbon dioxide = Yellow colour! During the daylight plants produce more oxygen by photosynthesis than they use up in respiration. At night plants produce only carbon dioxide by respiration.

Complete the grid using the key sentences around the room! Photosynthesis or Respiration Challenge! Complete the grid using the key sentences around the room!

Conditions Photosynthesis v respiration Overall Result Dark Dim light Bright light Conditions Photosynthesis v respiration Overall Result Dark Dim light Bright light

Respiration present No photosynthesis

Photosynthesis rate equals respiration rate

Photosynthesis rate is greater than respiration rate

carbon dioxide given out Oxygen is taken in carbon dioxide given out

each cancels the other out Neither gas is taken in or given out, as each cancels the other out

Carbon dioxide is taken in oxygen is given out

Conditions Photosynthesis v respiration Overall result Dark Dim light Bright light Respiration Oxygen taken in No photosynthesis Carbon dioxide given out Photosynthesis rate equals respiration rate Neither gas is taken in or given out, as each cancels the other out Photosynthesis rate greater than respiration rate Carbon dioxide taken in Oxygen given out

Respiration v Photosynthesis Complete the worksheet ‘respiration and Photosynthesis 1.’

Is respiration taking place? During the daylight plants produce more oxygen by photosynthesis than they use up in respiration. At night plants produce only carbon dioxide by respiration.

Multiple choice quiz Teacher notes This multiple–choice quiz could be used as a plenary activity to assess students’ understanding of photosynthesis. The question can be skipped through without answering by clicking “next”. Students could be asked to complete the questions in their book and the activity could be concluded by the completion on the IWB.

Multiple-choice quiz

HOT SEAT! Volunteer needed. You can only ask questions with a Yes or No answer. Am I furry? Am I large?

Chloroplasts

stomata

Limiting Factors

Sunlight

Carbon dioxide

Temperature

Glucose

Leaf

Anagrams

Food Quiz

What are the products of photosynthesis? Glucose Oxygen

What can glucose be converted into ? Starch Proteins Fats and Oils Cellulose

Which part of the plant do carrots come from? Roots

True Humans gain energy from eating starch stored in plants. True or False? True

How is glucose stored in the plant? Starch

What do you use to test for starch in food? Iodine Solution

If starch is present, what colour appears? Blue-Black