Paul Andersen explains how the behavior of various organisms is shaped by natural selection. The action of phototropism and the timing of photoperiodism have both been shaped by the relative availability of light. Courtship in the...

Paul Andersen explains how organisms regulate timing and control. Phototropism and Photoperiodism allow plants to respond to light throughout the day and year. Circadian rhythms are used in all organisms (including animals) as an...

Hank takes you through the weird, twisted forests of Russia and Eastern Europe, where trees grow at odd angles. What caused trees to grow into big wooden pretzels? Was it wind? Manipulation by woodworkers? Nazis, maybe? See for yourself...

This video describes how plants respond to the changes in their environment such as stimuli, drought, and phototropism.

When a plant grows in a particular direction in response to an external stimulus.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual...

Discover the hormones that dictate whether a plant grows downwards with gravity, towards water and nutrients, or upwards towards light. Biology - Plants - Learning Points. Tropisms allow plants to seek out the best conditions for...

Do you know how many years an oak tree can live for?
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Life processes - Green plants
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Learning Points
Following germinati
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n a taproot, grows from the seed.


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This video covers: - The idea that plants respond to their surroundings just like animals do - But that plants use local hormones rather than a nervous system - How auxins enable plants to respond to light (phototropism) and gravity...

Have you noticed that plants tend to grow in the direction of the sun? This redirection towards the sun a form of tropism, or plant movement. Learn about the common types of plant movement and their benefits!

In this video we are going to look at a few different ways in which plant hormones can be used.



Plant growth hormones (auxins) can be used as selective weedkillers. The selective weedkillers contain growth hormones,...

Students will learn why photosynthesis is so important to us. The different plant structures and compounds involved in photosynthesis and transpiration are highlighted. Beyond photosynthesis, plant responses to certain stimuli and...

Volvox colony releasing daughter colony into surrounding watercomposed of hundreds of green algae cells each with 2 whip like flagellae and a red eye spot.

T/L dung fungi (Pilobolus sp.) on cow dung take 4, UK

T/L dung fungi (Pilobolus sp.) on cow dung take 2, UK

T/L dung fungi (Pilobolus sp.) on cow dung take 3, UK

Volvox colony with daughter colonies; composed of hundreds of green algae cells each with 2 whip like flagellae and a red eye spot.

Volvox colony releasing daughter colony into surrounding watercomposed of hundreds of green algae cells each with 2 whip like flagellae and a red eye spot.

T/L dung fungi (Pilobolus sp.) on cow dung take 1, UK

Volvox colony releasing daughter colony into surrounding watercomposed of hundreds of green algae cells each with 2 whip like flagellae and a red eye spot.

Volvox colony with daughter colonies; composed of hundreds of green algae cells each with 2 whip like flagellae and a red eye spot.

T/L Pilobolus dung fungi on cow dung moving to sun take 3, UK

Volvox colony with daughter colonies; composed of hundreds of green algae cells each with 2 whip like flagellae and a red eye spot.

T/L dung fungi (Pilobolus sp.) on cow dung take 5, UK

Volvox colony with daughter colonies; composed of hundreds of green algae cells each with 2 whip like flagellae and a red eye spot.