A Wind-Up on Twitter

Twitter can be a great source of professional development, inspiration and collaboration for teachers. Just the other day I was looking for a hands-on activity with which to demonstrate elastic potential energy and energy transfer and so I tweeted for ideas. Here are some of the wonderful suggestions I received from the Twittersphere. Thank you everyone for your contributions!

Wind-up butterflies

Butterfly

Image credit: youaremyfave.com. Full instructions available here

Jumping insects

Cotton reel car

Rubber band powered car

Flipping toy

Balloon hovercraft

Worksheets for Practicals

A worksheet is a good way to give instructions of how to carry out practical work safely and effectively. The students can refer to it whenever they are unsure of what to do next and they do not have to waste time copying out the method into their workbook – they can focus on the results and what they mean. However, one of the disadvantages of using worksheets containing detailed instructions is that students can end up following them passively, like a cookery recipe.

In view of this, I have started to develop worksheets for practicals that make extensive use of diagrams or photographs (images can be snipped from instructional videos on YouTube) and the minimum use of words. Furthermore, I include questions about what the students are doing and why they are doing it as discussion points at each stage of the process. Below is an example of one such worksheet that I made for an investigation of chlorophyll using paper chromatography.

chromo1

chromo-2

Plotting the Solar System on My Maps

capture-solar

This is a fun activity for imparting the vastness of the solar system. Start by placing a football on the centre spot of the school football field or at the front gate etc. and informing your students that it represents the sun. If the circumference of the football is approximately 70 cm and the circumference of the sun is 4.3 million kilometres, how big would each of the planets in our solar system be (I like to provide a selection of everyday objects such as a tennis ball, apple, ping pong ball, and various marbles etc. for comparison) and how far up the road would they be located? Once the calculations have been made (this can be scaffolded by providing a conversion table or similar) ask the students to plot each planet, centered around the football, on Google My Maps.

Food Chains and Food Webs

The feeding relationships of the different organisms in an ecosystem can be shown most simply in a food chain. However, in most communities, animals will eat more than one type of organism and as such, a food web gives a more complete picture of exactly what eats what. Below are just a few ideas of how to teach both.

Wildlife documentaries

Wildlife documentaries contain lots of examples of real life (and often quite bloody) food chains and food webs, and asking the students to watch a few snippets before identifying the feeding relationships in each can prove a useful starting point to the lesson.

capture-6

Hanging mobiles

One common mistake when drawing food chains and food webs is for students to put the arrows the wrong way round and it is crucial that you emphasise that they point in the direction of energy flow up the chain. Asking students to construct food chain and food web hanging mobiles can help. You can download templates here or ask the students to make their own.

capture-new-1

Energy transfer

Energy transfer in food chains is inefficient; the amount of energy that is passed on is reduced at every step (trophic level). However, great care must be taken to ensure that you do not refer to the energy being lost, since energy can be neither created nor destroyed but rather is converted into some other form or store.

In food chains, much of the energy is transferred to the environment as heat during respiration but obviously some of it is also used by the organism (before it is eaten) in life processes such as movement and growth. Furthermore, not all of a food item may be ingested during feeding and, even if it is, not all parts will be digestible (e.g. lignin and cellulose).

A nice way to demonstrate energy transfer in a food chain is to pour coloured water between paper, plastic or styrofoam cups (each representing a trophic level) and reducing the volume of water transferred each time.

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Begin by pouring just 10% of the total volume of water in the jug (the sun) into the first cup (producer). This demonstrates that only about 10% of the sunlight that falls on a plant is used in photosynthesis since most of it is transmitted or reflected, and some of it is simply not the correct wavelength to be absorbed by the photosynthetic pigments in the leaf (only red or blue light is absorbed).

Next, pour roughly 10% of the water in the first cup into the second (primary consumer) and the remainder into another container labelled ‘Respiration (movement, warmth, growth) and excretion’ (do not pour the water down the sink as this will only reinforce the misconception that energy is lost). Repeat this process along the food chain.

By the time you reach the final consumer, only a couple of drops of water will remain. This is a good point in the learning to ask the students why food chains are usually restricted to just three or four trophic levels and why the number of organisms generally decreases along the chain.

Dinner at the Reef

This is a fun game from Arkive in which students learn about food chains in a marine environment, predator-prey relationships and the fine balance of an ecosystem. Although primarily aimed at 7 – 11 year olds it can also be used at Key Stage 3.

Interactive learning websites

There are now a large number of interactive learning websites offering simulations and simple ‘drag and drop’ style games for teaching younger students about food chains and food webs. Simply click on any of the images below to link.

capture-5capture-4capture-3

Hinge-Point Questions in Science

Hinge-point questions are diagnostic questions that are used at a particular point in a learning sequence when you need to check if your students are ready to move on and in which direction. Typically, hinge-point questions are multiple-choice and include wrong answers that challenge common student misconceptions. Critically, they are quick to answer and allow you to realistically view and interpret all students’ responses in 30 seconds or less.

Hinge-point questions should be used before you move from one key idea or learning intention to another, particularly if a solid understanding of the content before the hinge is a prerequisite for the next phase of learning. Apps such as Socrative, Kahoot and Plickers can all be used to provide instant feedback but mini-whiteboards or flashcards (below) also work well.

flashcards

Below are a couple of examples of hinge-point questions that I have used recently in my lessons. However, for more information, I highly recommend the free online course ‘Assessment for Learning in STEM Teaching’ offered by the National Stem Learning Centre via Future Learn.

Key Stage 3

cell-2

compund-3

GCSE

distance-time-graphs

reflex-action

A Level Biology

dna

glycogen

water-potential

Tissue Fluid

As blood flows through capillaries within tissues, some of the plasma leaks out through gaps between the cells in the wall of the capillary, and seeps into the spaces between the cells of the tissues. This leaked plasma is known as tissue fluid.

Tissue fluid is almost identical in composition to blood plasma. However, it contains far fewer plasma proteins as most are simply too big to pass through the tiny holes in the capillary endothelium. Red blood cells are also too big so tissue fluid does not contain these, but some white blood cells can squeeze through and move freely between the tissue cells.

The tissue fluid leaves the capillaries under high pressure at the arterial end of capillary beds. In order to demonstrate this I use the following:

  • Five or six small balloons
  • Permanent marker pen
  • Large glass bowl
  • Glass jug
  • Water
  • Yellow food-colouring
  • Red beads
  • Rice
  • Pestle and mortar
  • Sieve

tissue-fluid

Use the permanent marker pen to draw nuclei on the balloons and then place them into the glass bowl. The balloons represent the tissue cells. Fill the glass jug with water and add a drop or two of yellow food colouring (blood plasma). Throw in some red beads (red blood cells) and rice (plasma proteins) – grind up the rice in the pestle and mortar beforehand so that you have different sized fragments.

Pour the ‘blood’ through the sieve, highlighting that the holes in the sieve represent the tiny gaps in the capillary wall. I like to pour it from a great height so that it sprays everywhere (showing that the blood is under high pressure) and covers the cells below. Highlight that none of the red blood cells have passed through the holes and nor have most of the plasma proteins (the students should see some of the smaller bits of rice floating about in the tissue fluid but most will remain trapped in the sieve).

 

Desert Island Apps for Teachers

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There are thousands of websites and apps aimed at teachers but if you had to pick just 10 that you couldn’t live without – the digital bare essentials of a 21st Century classroom, your desert island apps – what would they be?

Here, in no particular order, are mine.

1. Google Drive and Google Classroom

Google Drive includes Google Docs, Sheets, Slides and Forms as well as many other GAFE (Google Apps for Education). Google Classroom is a learning platform for schools which brings it all together in a secure online environment. Drive and Classroom allow students to collaborate and share files quickly and teachers to create and distribute assignments, flip learning, grade work, and post notices. Indispensable.

2. Kahoot!

Without doubt this would be the students’ choice. Kahoot! is an enjoyable, game-based learning platform with many similarities to (the also excellent but less jovial) Socrative. Use it to build fast paced multiple-choice quizzes and class surveys or pose questions at hingepoints during a lesson to receive instant feedback from all. Formative assessment at its most fun.

3. TES Teaching Resources

If you didn’t already know, TES Teaching Resources is a vast online library of mostly free lesson plans and classroom resources uploaded by teachers from around the world. To be honest, it’s not all great but there are some real gems in there which are more than worth the rummage. The site is also home to Teachers’ TV; a source of high quality videos on teaching and learning in Early Years, Primary, Secondary and FE, as well as films to help with continued professional development.

4. Adobe Voice

This one is relatively new on the scene but I love the simplicity of this application for making short, highly-professional-looking animated videos. I have written about it many times in this blog and confess to being a huge fan.

5. Online-Stopwatch.com

This site provides a variety of different stopwatches and clocks which can be used to add a sense of urgency to any starter activity or plenary, help keep younger students on task, or be clearly displayed during classroom-based tests.

6. Educreations

There are now a huge number of apps for creating video tutorials on the iPad but I have mostly remained faithful to Educreations as it works seamlessly with Google Drive and is so simple and intuitive to use. As well as making tutorials, I find it useful for providing feedback on larger pieces of student work (e.g. posters or models). I simply take a photograph, import it into Educreations, and then comment and annotate over it before sharing with the student via Classroom.

7. Twitter

We all know that Twitter is essentially a virtual staffroom for sharing resources, airing opinions and generating discussion but it can also be used to support learning in the classroom. For example, I have used it to provide a running news feed, tracked hash tags, connected with other classrooms and industry professionals, and encouraged students to send live Tweets during field trips. There are lots of possibilities. Not convinced? Here is a useful post by the brilliant @ICTEvangelist on the dos and don’ts of getting started in the pedagogical Twittersphere.

8. Armoured Penguin

The best site I have found for making crosswords and other simple word games. All free and easily converted into PDF.

9. YouTube

Create playlists of videos on particular topics, import videos into Google Forms as a flipped learning activity, post video tutorials, find sound effects to really bring your lessons to life, or simply mine this vast resource for educational audio visuals. TeacherTube, TedEd, How Stuff Works, BBC and Sick Science are just some of my favourite channels.

10. Visible Body 3D Human Anatomy Atlas

This is the only subject-specific entry on my list and a costly one (at the time of writing £18.99 from App Store) but it is a simply stunning piece of kit with an impeccable 3D interface offering students a far greater appreciation of anatomical structures than the flat drawings of a textbook ever could. The high-resolution graphics offer smooth zooming, panning and rotating capabilities and the concise labelling (showing the name of each structure and the system hierarchy to which it belongs) make it particularly useful for older students during organ dissections and demonstrations. Brilliant.

So there you have it, my top 10 teaching websites and apps. I would love to hear about your own desert island choices!