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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 ...

Teacher resource

reSolve: What a Load of Rubbish

In this series of three lessons, students conduct an audit of the rubbish they find in their playground. They use a range of categories to sort, display and interpret the data and make simple inferences. They then reclassify the rubbish collected as to whether it can be recycled, composted or if it needs to go into the ...

Teacher resource

reSolve: Sport Stats

In this lesson, students examine sporting scores and explore the concept of the average of a set of scores. Students collect sporting scores from real and hypothetical games, use blocks to visualise an even distribution of scores across matches and then explore how to calculate the average of a set of scores. The lesson ...