1 March 2006Download 2.3_2.0b Science Knowledge: Science 2: Life Processes and living things K2.3...

March 2006 Download 2.3_2.0b

1Science Knowledge: Science 2: Life Processes and living things K2.3 Green plants and organisms

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Authored by Keith Ross, University of Gloucestershire. accessed from http://www.ase.org.uk/scitutors/

date created March 2006

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Life & Living Processes

Plants and other green organisms

Elicitation questions and some background ideas


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Staying Alive … Elicitation question ~ two tubs

Where has the extra ‘stuff’ come from?

Only rain water is added to the growing tree over 5 years. There is the same amount of soil as there was, but the tree has grown big.


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Foundation Stage

Knowledge & understanding of the world: Find out about & identity some features of

living things


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Key Stage One Plants are alive! Plants need light and water to grow Recognise and name parts of plant Life Cycle of plants


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Key Stage Two Effect of light, air, water and temperature Parts of the Plant ~ functions:

Leaf; Root; Stem; Flower

Life cycle ~ various stages


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Key Stage Three and four Photosynthesis Transport in plants Germination and growth Ecology


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What is a Plant?Leaf;Root;Stem;Flower

•Transport

•Support

•Food production

•Reproduction

•Water and minerals

Match the part(s) of the plant with the functions


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How plants work Germination and growth – materials and

energy (seed and cells) Photosynthesis – production of food and

oxygen (leaves) Growth and transport (stem and roots) Reproduction and life cycle (flowers)


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Plants & energy

Click two of the following, which are sources of ENERGY for a plant to grow

Carbon dioxide and water 38% Minerals taken up from the soil 40% Sunlight through photosynthesis 90% Glucose and oxygen through respiration 26%

%ages are for a group of 100 trainee primary teachers on entry to ITE, having obtained a ‘C’ or better at GCSE, usually two or three years previously.


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Photosynthesis The next three slides provide a rather different

holistic view of photosynthesis. Emphasis is on the role of oxygen, released

during photosynthesis and used during respiration.

We focus too much on the role of biomass (the fuel) in carrying energy – it is the system, the fuel/oxygen system that stores the energy.


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Diagram to show that on this planet, whilst energy is degraded matter is cycled


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An Ecosystem?An Ecosystem?

PhotosynthesisPhotosynthesis RespirationRespiration

Oxygen in

Fuel line

Oxygen out


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Respiring plants? When do living plants respire? At night only 20% Never 6% All the time 60% In the daytime only 11%


16

Plants and germination Click any of the following substances that a

germinating seed requires? Soil 55% Water 94% Light 70% Oxygen 32% Carbon dioxide 54%


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Energy for germination Which of these is the direct source of energy used

by a seed as it germinates? Carbon dioxide and water 31% Light from the sun 53% Respiration of carbohydrate in the seed 12%


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Germination This time-lapse video was made by Colin

Forster of the University of Gloucestershire using the Blue computer-linked microscope given to all primary schools.

Click screen to start videoVideo by

Colin Forster


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Plants & Fertiliser

Many farmers add nitrogen-based fertiliser to their soil. Click up to 3 of the following to show what could happen to the nitrogen. It could....


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Plants & FertiliserNitrogen could … . … be taken up by the plant and become

part of the plant 80% … return to the atmosphere during

photosynthesis 55% … return to the atmosphere by bacterial

action 35% … dissolve in rainwater and leech into

nearby streams 77%


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Transport in plantsWater, minerals and oxygen (air) in soil

Carbon dioxide and oxygen in air Fuel and materials from leaves to roots? Oxygen to roots? .. to other cells? Minerals and water from roots to leaves phloem and xylem


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How the mangrove tree gets air to its roots. www.niceness.org/pics/indo/15.html www.answers.com/topic/mangrove

The Mangrove tree.The Mangrove tree.

Water logged roots obtain Water logged roots obtain their oxygen by putting up their oxygen by putting up these snorkels – vertical these snorkels – vertical tubes giving the flooded tubes giving the flooded roots access to airroots access to air


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Staying alive … Transpiration ~ give me water!


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Let’s talk babies … Why do daffodils produce flowers? Why do apple trees produce apples? How and why do flowering plants produce

seeds? How do seeds travel to new places? What is the difference between

germination and growth?


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Let’s talk babies ctd…

http://www.geocities.com/mabdulrahmanb/plants


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Staying Alive … Adaptations


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fruit, nut, seed or vegetable?Meaning for (a) shopper (b) scientist?

tomato peanut corn-on-the-cob

runner-bean apple cucumber

cabbage black-pepper rhubarb


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Fruit or Vegetable?


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Before you complicate things with too much detail, make sure your pupils understand how plants work:

Why do they spread their leaves? .. and their roots?

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