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Interactive resource

Forensic science: DNA

Explore the basic properties of DNA. See how DNA samples are collected and analysed by police. Find out how DNA fingerprinting can be used to identify a person and help to solve a crime. Identify differences between DNA samples. This learning object is one in a series of eight objects.

Image

Leaf section with stomata, mesophyll and epidermis

This colour image is a dissected cross-section of a leaf at 55 times magnification. It shows the structure of the leaf, the organisation of cells, spaces between some cells and some internal cellular features. The structure includes the epidermis, mesophyll and stomata cells.

Image

Stoma on surface of buttercup leaf

This photograph of a stoma (plural: 'stomata') and guard cells on a buttercup leaf was taken using a scanning electron microscope (SEM). Stomata are pores in the surface of a leaf. The stomata and guard cells regulate the gases entering and leaving a plant's leaf.

Image

Single stoma on a leaf surface

This is a photograph of a thin slice from the surface of leaf. The specimen has been stained and magnified 350 times under a light microscope. The stoma is surrounded by two guard cells. Chloroplasts can be seen within the guard cells.

Teacher resource

Push your luck

This teaching resource outlines an introductory activity for students involving rolling two dice multiple times, adding the numerical value shown on the faces and recording the outcome using a tally sheet. The resource could be used by teachers to plan a class activity, or for students to carry out at home. The resource ...

Moving Image

BrainPOP: tally charts and bar graphs

This animated video describes what a tally chart is and what a bar graph is, what they are used for, and how to create and interpret them. It describes how tally charts can be useful for collecting survey data and demonstrates the conventional way of recording this data in groups of five strokes so they can be easily counted. ...