j)+Coordination+and+response+(Plants)

Section 2- Structures and functions in living organisms a) Levels of organisation - b) Cell structure - c) Biological molecules - d) Movement of substances - e) Human Nutrition- e) Plant Nutrition - f) Respiration - g) Gas exchange (Humans) - g) Gas exchange (Plants) - h) Transport (Humans) -h) Transport (Plants) - i) Excretion - j) Coordination and response (Humans) - j) Coordination and response (Plants)

2j) Coordination and response (Plants)
//"Tropism is a growth movement towards or away from a stimulus such as light, gravity or moisture" //
 * Starter **

Watch phototropism happening thanks to this video from Indiana University


 * Learning outcomes (s//tudents will be assessed on their ability to)//**
 * 2.80 || understand that plants respond to stimuli ||
 * 2.81 || describe the geotropic responses of roots and stems ||
 * 2.82 || describe positive phototropism of stems ||


 * Tutorials, Presentations and learning resources**

BBC Bitesize review has good interactive graphics and covers both geotropism and phototropism

The s-cool tutorial on plant growth covers plant hormones, phototropism and geotropism. Stick to your learning outcomes when using this resource

A good video tutorial on phototropism and geotropism from Britannica online media type="custom" key="23691774"

Learn about tropisms using the KScience animation

Video tutorials from [|C4B videos] and textbook sections addressing some outcomes // N.B. due to syllabus changes the numbering and wording of some outcomes has changed since the videos were recorded. // 2.80 understand that plants respond to stimuli [|download] media type="custom" key="23691772"

2.81 describe the geotropic responses of roots and stems [|download] media type="custom" key="23691770"

2.82 describe positive phototropism of stems [|download] media type="custom" key="23691766"

Construct your own notes for this topic. Guidelines for note construction are as follows: > > > > > media type="custom" key="27838599"
 * Approach**
 * 1) Create a blank document called "2j - coordination and response (plants)"
 * 1) At the top of your document add the learning outcomes
 * 1) Divide your document into a further four sections. The first three match the learning outcomes. The is for the last summary questions.
 * 1) In each section take notes: your teacher will give you an initial outline afterward view the click4biology videos at your own pace, add screen shot and improve your notes as necessary. To check their completeness review a second source against what you have written. Finally check your notes with your teacher, highlighting points you are not sure on.
 * 1) Add the summary questions (below) to the appropriate section and answer them:

Helpful notes - try to build your own notes first ask later for access to this link

After germination the seedlings in your experiment will exhibit phototropism and both negative and positive geotropism. Take photographs of each your experiment and annotate each to explain why it demonstrates a tropism. Add the photos and annotations to your notes (above).
 * Practical work**

Practical 1 setup
 * 1) use a transparent plastic cup.
 * 2) Obtain a paper towel longer than the circumference of the plastic cup.
 * 3) Fold a paper towel into a tight circle so that it is smaller than the cup.
 * 4) Place inside the plastic cup and let the 'spring' of the towel hold it against the edge of the cup.
 * 5) Add a depth of approx. 1cm of water to the cup.
 * 6) Take four bean seeds place each between the paper towel and the cup above the water. Each seed should be rotated to a different angle, i.e. the micropyle on one should face up, a second down, a third right and a fourth left.
 * 7) Observe their growth after approx. 4 days. During this time make sure that the water in the cup is maintained at a depth of 1cm.

Practical 2 setup
 * 1) Germinate four seeds (bean seeds work well) in similar conditions (wet - __don't completely cover the seeds in water they will die due to lack of oxygen__, warm, plenty of oxygen)
 * 2) Cover the plumule (embryonic shoot) of two seedlings with aluminium foil
 * 3) Place a light source to the side of the shoots
 * 4) Make sure the seedlings have have enough water (see step 1)
 * 5) Observe the seedlings after two days

media type="custom" key="23691760" media type="custom" key="24182474"
 * Examples of student work (movies)**