Y8Biology-Lessons1-3

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YEAR 8 BIOLOGYSoW FOR PUPIL TRACK 1:

PLANT BIOLOGY~ SEPTEMBER-OCTOBER 2012 ~

Lesson 1 - - - - Plant Structure

Lesson 2 - - - - Gas Exchange in Plants

Lesson 3 - - - - Chlorophyll and

Photosynthesis

Lesson 4 - - - - The Fate of the End Products

of Photosynthesis

Lesson 5 - - - - Conditions for Plant Growth

Lesson 6 - - - - Plants for Food 1

Lesson 7 - - - - Plants for Food 2


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Lesson 1: Plant StructureLesson Objectives:

1. That plants are comprised of cells, tissues and organs.2. That plants make their own food by photosynthesis.

Year 8 Biology

Pupil Track 1

Sep-Oct 2011

TIMING0-5min

5-

45min

45-50min

Starter

Remind pupils of structure of Cells, Tissues and Organs (brainstorm those in humans andplants).

Main Body

Activity 1: PowerPoint Presentation (PPP) show presentation (Lesson_1.ppt) and

discuss with pupils as they fill in p1-3 in booklet

Activity 2: Revision of a balanced diet for humans. Name the 7 requirements. The samerequirements are needed by plants for much the same reasons. Food to respire and food to

make new cells (remember plants dont need roughage as their cell walls are roughage.)

Plants differ because they can make their own food by photosynthesis. Notes in books.

Plenary

Tie it all together. Plant structure is designed to obtain the requirements forphotosynthesis and to reproduce. Different plant shapes are different methods of doingthis and evolution has occurred by competition to give all the modern types of plant.

Homework

Word search (in booklet): students answer the questions on p4 and then find the words.

RESOURCES/ NOTES

Riley: BiologyNow! textbook

and/ or

Coordinated

Science: Biology

textbook

Worksheet in

filing cabinet next

to pigeon holes:

1. Plant Structure

PowerPoint

presentations

and videos in

R:/Science/KS3/Y

8/ Biology/Lesson

Resources.


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Lesson 2: Gas Exchange in PlantsLesson Objectives:

1. What is meant by photosynthesis and how it is used by plants to make food.2. The word equation for photosynthesis.

3. That photosynthesis requires light and how this can be shown experimentally.

Year 8 Biology

Pupil Track 1

Sep-Oct 2011

TIMING0-

10min

10-

45min

45-50min

Starter

Optional: go over homework (word search).Set up activity 1 while introducing the lesson (this experiment needs about 55mins to

work).Introduce the idea that all living cells respire all the time (MRSGREN). Plant cells are no

exception. Respiration requires oxygen and produces carbon dioxide. Photosynthesis is

the way a plant obtains its nutrition and this requires carbon dioxide and produces

oxygen. This reaction requires light energy.

Main Body

Activity 1: An experiment to show how carbon dioxide exchanges in the

light and dark (see p5 in booklet).

Activity 2: Notes in exercise books:

General heading: PLANT NUTRITION: PHOTOSYNTHESIS.

Brief introduction as the way the plant obtains nutrition. Give word equation:Carbon dioxide+Water+Light Energy Chlorophyll Glucose+Oxygen

Respiration is the way the plant obtains the energy from the glucose made in

photosynthesis. Give word equation:Glucose+Oxygen Carbon dioxide+Water+Energy

Sub heading: Gas Exchange in a plant.

Gas exchange is by diffusion.

Gases pass through stomata in leaves and very small holes called lenticels in the

woody parts of stems and roots

Air must be present in the soil for the roots to respire. Over-watered pot plants die

due to lack of air to the roots; animals such as earthworms aerate the soil.

Touch on the mechanism by which stomata open and close due to osmosis in the

guard cells if timePlenary

Show and discuss results of experiment; pupils to answer questions on this experiment in

their booklets (p6).Homework

Revise the equations for photosynthesis and respiration for a mini-test at the start of next

lesson/ finish questions as above.

LESSON_2: Practical Tips

Method

Set up at different distances from a single constant light source, a pair of clear glass airtight bottles as

follows:o Bottle 1: control - red-orange equilibrated bicarbonate indicator.

o Bottle 2: experiment - same volume of red-orange indicator with Elodea.

All bottles have the same volume of equilibrated indicator/ the samples of Elodea are from the same

plant and same mass/ temperature to remain constant at room temperature, 20C.

Leave the set up for an hour.

Passing fresh air through the indicator makes its carbon dioxide concentration equal to the atmosphere

- it is said to be 'equilibrated' and has a red-orange colour. The colour will change if the pH changes.

Loss or gain of CO2 changes the pH of the indicator because CO2 is reasonably soluble in waterforming carbonic acid. Therefore bicarbonate indicator responds to changes in its carbon dioxide

concentration. If equilibrated indicator gains CO2 (Elodea adds it to water during respiration) it

becomes more acidic turning yellow. If equilibrated indicator loses CO2 (Elodea removes it from

water during photosynthesis) it becomes more basic turning purple.Results

Control Results: the indicator colour has not changed, all red-orange.

The plant at compensation point is still red-orange - unchanged indicator.

P = R: no loss or gain of CO2 by the indicator.

The plants closer to the light will have turned the indicator purple. The light intensity is greater than

compensation point. P > R. Indicator lost carbon dioxide to the plant so the indicator went more basic.

The plants further from the light will have turned the indicator yellow. Light intensity is less than

compensation point. P < R. Indicator gained carbon dioxide from the plant so the indicator went more

acidic.

RESOURCES/ NOTES

Riley: BiologyNow! textbook

and/ or

Coordinated

Science: Biology

textbook

Worksheets (x10)

in filing cabinet

next to pigeon

holes on the

subject of

Photosynthesisand one on the

subject ofGas

Exchange.

PowerPoint

presentations

and videos in

R:/Science/KS3/Y

8/ Biology/Lesson

Resources.

Information for TechnicianEquipment for teacher demonstration:

Lamp

2 clear, airtight bottles

Red-orange equilibrated bicarbonate indicator

Elodea


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