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We will be introducing the new Knowledge and Learning Beta website over the coming months. Clips for use in the classroom are now available on your phone, tablet or PC.


Alternatively, you can still browse or search by keyword or clip number on this site.

Clip description Keywords
Abscission – Why do plants shed their leaves in autumn?
Abscission – Why do plants shed their leaves in autumn?

Duration: 02:09

Chris Packham explains why and how deciduous trees drop their leaves every autumn.

 
Autumn colours
Autumn colours

Duration: 01:04

Tree foliage changes colour in the autumn.

 
Cells, tissues and organs in plants
Cells, tissues and organs in plants

Duration: 01:51

Specialised cells in plants are organised into tissues, organs and systems.

 
Components of a plant cell
Components of a plant cell

Duration: 01:23

The presenters build a plant cell and describe the role of each component.

 
Leaf structure and the absorption of carbon dioxide
Leaf structure and the absorption of carbon dioxide

Duration: 01:00

Leaves have stomata through which they absorb carbon dioxide.

 
Nitrogen-fixing leguminous plants
Nitrogen-fixing leguminous plants

Duration: 01:02

The role of nitrogen-fixing leguminous plants in soil improvement is examined and crop rotation is briefly discussed.

 
Plant adaptations - extreme cold
Plant adaptations - extreme cold

Duration: 04:08

How is plant life adapted to survive in freezing Arctic temperatures? A limited number of species including algae and lichens are able to survive all year round.

 
Plant adaptations - extreme heat
Plant adaptations - extreme heat

Duration: 2:02

How can the Eucalyptus tree flourish in the heat of Australia? Eucalyptus leaves are poisonous and can be eaten only by Koala bears.

 
Plant adaptations - high altitude
Plant adaptations - high altitude

Duration: 05:42

How do plants survive at high altitude? Temperature and other climate conditions change rapidly and plants have specific adaptations to survive.

 
Sachs and the discovery of the chloroplast
Sachs and the discovery of the chloroplast

Duration: 03:41

The advent of modern microscopy enable Sachs and others to see inside leaf cells and see chloroplasts and the way they behave. The formation of starch grains is also demonstrated with high magnification images.

 
The binomial system of classification
The binomial system of classification

Duration: 04:54

Carl Linnaeus developed the binomial system of naming plants. This form of classification become the international standard.

 
The cell membrane
The cell membrane

Duration: 01:05

The process of diffusion is explained with reference to a cell membrane.

 

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