Integrated Science M1 plants and the making of food

OBJECTIVESOBJECTIVES

What is photosynthesis?


Why is photosynthesis important?


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INTRODUCTIONINTRODUCTION

Test Yourself before you begin!


Integrated Science Module 1 Unit 2 Lesson 3






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When you complete this slide presentation, you will be able to:

define photosynthesis.write a word equation and a chemical

equation for the process of photosynthesis.state the role of chloroplasts in

photosynthesis.access information via the internet.






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Where do plants get their food from?

Where do plants get their food from?

INTRODUCTION INTRODUCTION

Do they get food from the soil or from the air?

Do they get food from the soil or from the air?

Do plants even need or use food?

Do plants even need or use food?

Do plants eat like

animals?

Do plants eat like

animals?






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Test yourself: Test yourself: What do you What do you know about how plants get know about how plants get food? food? On the next two slides you will find

a quiz with a total of eleven (11) statements. Read each statement.If it is true, click TRUE. If it false, click FALSE.After completing the quiz, discuss your answers with your teacher.Then, click the FEEDBACK button for additional information.Click the next button to see the quiz.






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So … What do you know So … What do you know about how plants get food? about how plants get food? 1. Plants do not need food.

2. Plants make their own food.

3. Plant roots absorb food from the soil.

4. Plants use their own food made during photosynthesis.

5. Plants absorb water and minerals from the soil to make food.

6. Plants need Carbon dioxide from the air to make their food.

TRUE FALSE

TRUE FALSE

TRUE FALSE

TRUE FALSE

TRUE FALSE

TRUE FALSE






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So ... What do you know about So ... What do you know about how plants get food?how plants get food?7. Variegated leaves cannot make food.

8. Light is required for photosynthesis.

9. Oxygen is required for photosynthesis.

10. Plants produce glucose from photosynthesis.

11. Plants do photosynthesis in the day and respiration at nights.

TRUE FALSE

TRUE FALSE

TRUE FALSE

TRUE FALSE

TRUE FALSE

FEEDBACKFEEDBACK






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Feedback to: So ... What do you Feedback to: So ... What do you know about how plants get know about how plants get food?food?

1. Plants do not need food. All living things, including plants, need food. That’s the life process called nutrition.

2. Plants make their own food. Yes they do! By a process called photosynthesis!

3. Plant roots absorb food from the soil. No! plants do not absorb food … they absorb water (+ mineral ions/salts like magnesium, potassium). Water is one of the ‘raw materials’ used in food-making or photosynthesis.

4. Plants use their own food made during photosynthesis. Yes. Plants use the food they make for energy and as raw materials to make their various body structures.

5. Plants absorb water containing mineral ions/salts from the soil to make food. Yes they do!

6. Plants need Carbon dioxide from the air to make their food. Plants use the Carbon from Carbon dioxide to make sugars.






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Feedback to : So ... What do you Feedback to : So ... What do you know about how plants get know about how plants get food?food?

7. Variegated leaves cannot make food. If this were true then plants with those kinds of leaves would die! Food is made in the green parts of variegated leaves.

8. Light is required for photosynthesis. The energy from light is what is converted to energy in food by plants

9. Oxygen is required for photosynthesis. Oxygen is not required, rather, it is produced.

10. Plants produce glucose from photosynthesis. Yes this is the first product.

11. Plants do photosynthesis in the day and respiration at nights. Whilst photosynthesis needs light to occur, respiration can occur whether light is present or not – so respiration occurs both in the day and night.

From the feedback to these questions, think about how you would define photosynthesis.






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What is photosynthesis?What is photosynthesis?

Photosynthesis is the process by which most green plants get their food.Click below to see some unicellular organisms that photosynthesize.

Note the green chloroplasts they contain!

http://www.youtube.com/watch?v=Md0PtdRxXvw&feature=related Multicellular green plants

that live both in aquatic and terrestrial environ- ments also have chloroplasts and make their

food by photosynthesis.

Green Algae

http://www.fotosearch.com/photos-images/ferns.html

Fern






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What is Photosynthesis? What is Photosynthesis?

Think carefully – What is this diagram telling you about photosynthesis? Tell your teacher.

INPUTS

PRODUCTS

Note the ‘INPUTS’ and “PRODUCTS or OUTPUTS’






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What is Photosynthesis? What is Photosynthesis?

Photosynthesis can be summarized as a word equation:

You already know these chemical symbols: water = H2O, Carbon dioxide = CO2 and Oxygen = O2. Note that glucose = C6H12O6. How would you re-write the above word equation for photosynthesis with chemical symbols? Try it!

Substrates or Reactants Product & By-product

produce Carbon dioxide Water and Glucose and Oxygen

SHOW ME!SHOW ME!SHOW ME!SHOW ME!

CO2 H2O+ C6H12O6 + O2

SHOW ME!SHOW ME!SHOW ME!SHOW ME!

AND

EQUATIONS FOR EQUATIONS FOR PHOTOSYNTHESISPHOTOSYNTHESIS






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What is Photosynthesis?What is Photosynthesis?EQUATIONS FOR EQUATIONS FOR PHOTOSYNTHESISPHOTOSYNTHESIS

Light energyLight energy

chlorophyllchlorophyllThe equation says: Six molecules of Carbon dioxide plus six molecules of water in the presence of chlorophyll and sunlight produce one molecule of glucose and six molecules of Oxygen.

Answer: (a) The quantities of the ingredients, and (b) the conditions under which the process occurs. Note that the amount of elements balance on each side of the chemical equation, shown below.

6CO2 6H2O+ C6H12O6 + 6O2

Read Box 3.1 in your SIM.If you were relating the equations on the previous slide to a recipe, what else would be needed? CHECKCHECKCHECKCHECK






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What is Photosynthesis?What is Photosynthesis?

Photosynthesis is the process in which green plants use water and Carbon dioxide and the energy of light to produce a carbohydrate e.g. glucose, in which energy is stored, and during the process they give off Oxygen.

CHECKCHECK

It is thought that photosynthesis is the most important reaction in the world!What is photosynthesis? Discuss it in your group, then type your response in the box below. You must be in Slide Show View to type and delete text. Click CHECK for Feedback.






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Why is photosynthesis so Why is photosynthesis so important? important? - - Food and fuel for Food and fuel for living thingsliving things

“The ability to capture the energy of sunlight to make glucose puts plants at the bottom of the food chain, making them the producers of the energy needed for much of life on earth.”

When animals eat, they get food and their energy or ‘fuel’, either directly or indirectly from green plants that carry on photosynthesis!

When animals eat, they get food and their energy or ‘fuel’, either directly or indirectly from green plants that carry on photosynthesis!

“Even the ‘waste’ product of photosynthesis, i.e., oxygen, is necessary for animals to survive. Hundreds of millions of years ago, the earth’s atmosphere was mostly carbon dioxide. Thanks to photosynthesis, there’s now enough oxygen to sustain animal life.”

Watch this clip > http://www.youtube.com/watch?v=pmebLsHPbsU






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REVIEW and QUIZREVIEW and QUIZ

Are you ready to test yourself? There are three (3) Multiple Choice items that you are required to do. For each item, click on the letter of the correct response and then click the button ‘NEXT QUESTION’ to continue.There are also two (2) Review Questions for you to answer. Click BEGIN QUIZ to start.

BEGIN QUIZ!BEGIN QUIZ!






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QUIZ: Question 1QUIZ: Question 1

In the overall equation for photosynthesis, six molecules of carbon dioxide are used up and six molecules of ______ are produced.

A. water A. water

B. glucoseB. glucose

C. starchC. starch

D. oxygenD. oxygen

FEEDBACKFEEDBACKFEEDBACKFEEDBACK






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QUIZ: Feedback to Question 1QUIZ: Feedback to Question 1

In the overall equation for photosynthesis, six molecules of carbon dioxide are used up and six molecules of D = Oxygen are produced.

NEXT QUESTIONNEXT QUESTIONNEXT QUESTIONNEXT QUESTION

A - water is a reactant not a product; it is a substrate.

B - only one molecule of glucose is produced.C – starch is not formed directly from

photosynthesis; glucose is formed.D – six molecules of Oxygen are produced.






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Plants trap the energy from the sun with light-absorbing molecules called ____ .

A. water A. water

D. mesophyllD. mesophyll

C. chloroplasts C. chloroplasts

B. chlorophyllB. chlorophyll







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Quiz: Feedback to Question 2Quiz: Feedback to Question 2

Plants trap the energy from the sun with light-absorbing molecules called B = chlorophyll.

A – water is not a light absorbing molecule; it is one of the substrates in the process of photosynthesis.

B – chlorophyll is a pigment that absorbs light.C – chloroplasts are where the chlorophyll

pigment is located.D – mesophyll is the middle layer of tissue in

leaves in which chloroplasts are located.







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If carbon dioxide is removed from a plant’s environment, what would be the effect on the plant’s ability to produce sugars?

A. More sugars will be produced. A. More sugars will be produced.

D. The same number of sugars will be produced as oxygen will replace carbon dioxide.

D. The same number of sugars will be produced as oxygen will replace carbon dioxide.

B. The same amount of sugars will be produced.

B. The same amount of sugars will be produced.

C. Less sugars will be produced. C. Less sugars will be produced.







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Quiz: Feedback to Question 3Quiz: Feedback to Question 3

If carbon dioxide is removed from a plant’s environment, what would be the effect on the plant’s ability to produce sugars?


Option C is the only plausible response. Carbon dioxide provides both carbon and oxygen to make glucose. No other molecule can replace carbon dioxide.






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Review Question 1Review Question 1

In the box below, write a word equation for photosynthesis. You must be in Slide Show View to type and delete text. Click CHECK to read the Feedback.

Carbon dioxide and water in the presence of light and chlorophyll, produce glucose and oxygen.CHECKCHECKCHECKCHECK






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Review Question 2Review Question 2

In your notebook, write the narration for the video at: http://www.youtube.com/watch?v=prFaSe3s9e0






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CREDITSCREDITS

http://www.nbclearn.com/chemistrynow/week9http://www.youtube.com/watch?v=eelswM2YP_khttp://www.youtube.com/watch?v=IlmgFYmbAUg&NR=1&feature=endscreen

Date post:	15-Aug-2015
Category:	Education
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Integrated Science M1 plants and the making of food

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