Shoot thigmotropism Animation Play

Simple plant tissues Illustration Play

Sizes of plant cells Slideshow Play

Smelting lead Animation Play

Soil Student activity Play

Sources of dioxins Slideshow Play

Species Student activity Play

Specific structures of plant cell – vacuole and cell wall Whiteboard exercise Play

Specific structures of plant cell – vacuole and cell wall Student activity Play

Spontaneous chemical modifications of nitrogenous bases Slideshow Play

Stages in the development of a new plant variety Whiteboard exercise Play

Stages of water transport through a plant Animation Play

Standard entropy values Animation Play

State of chemical equilibrium Animation Play

Statements about chemical reactions Whiteboard exercise Play

Statements about least useful chemical reactions Whiteboard exercise Play

Statements about plant requirements Whiteboard exercise Play

Statements about the importance of chemical reactions Whiteboard exercise Play

Statements about types of chemical reactions Whiteboard exercise Play

Static equilibrium and dynamic equilibrium Audio text Play

Statistical problem specification Student activity Play

Stomata Animation Play

Storage organs in plants Slideshow Play

Storage substances and storage organs in plants – fats Whiteboard exercise Play

Storage substances and storage organs in plants – proteins Whiteboard exercise Play