Biogeochemical Cycles

Water cycling is explained in this simple animation
Global Hydrological Cycle

Succession

An animation about succession in a glacial moraine.
Plant Succession

Biome

This animation explains all biomes in the world using audio, photos and several other resources.
Biomes

Frog

Metamorphosis of frog is explained in this simple animation with audio
Metamorphosis of frog

Digestion

This simple animation explains how food is digested in humans. The animation is basic and humorous.
Basics of Digestion

If you want to see Peristalsis, see this Flash animation.
Peristalsis

This is a marking exercise using digestive system. The explanations are very good.
Digestion Drag & Drop

Another marking exercise for digestive system
Drag & Drop Digestion

This is an activity explaining the processes of digestive tract. Color codes have to be kept at the proper position to succeed. Simple one.
Digestive Process - Drag & Drop

Gastro Intestinal Hormones

This animation gives a detailed description about the control of secretion of Gastric juice in the stomach (with audio)
Secretion of Gastric juice - control

The simple flash animation explains how secretin makes the chyme neutral
Secretin Action

This one explains the action of CCK
CCK action

Photosynthesis

An introduction of photosynthesis is given in this tutorial. Towards the end of the tutorial there is an interactive session by which the source of oxygen, that is released as a byproduct, is explained.
Photosynthesis - Introduction

A description of how ATP are captured in the light reactions of the photosynthesis is explained here. It may appear a bit complex, if you are not familiar with the electron transport system.
Light Reaction - ATP formation

Two animations are given here. The first one explain cyclic and noncyclic photophosphorylation in bacteria and plant cells. This appears a bit complex, if you don't know the basics. The second animation is quite simple explanation of how ATP and NADPH are produced during light reaction.
Light reaction - ATP formation - simple

Another animation that shows ATP and NADPH formation in light reaction. This has no audio but is easy to load and the movement of electrons can be seen clearly.
Light reaction - animation

An interactive animation with a good introduction of chloroplast. The audio is given only at certain points when we click on each system in the electron transport chain. Good one.
Interactive photosynthesis

The best interactive animation of light reaction. It explains the electron transport system in photosynthesis
Interactive photosynthesis - better one

The one and only animation that explains Calvin Cycle - the dark reaction.
Dark Reaction - Calvin Cycle