Leaf me alone

How and why do leafs fall off trees?

At the base of each leaf there is a special layer called the abscission zone and when the time comes to shed a leaf, the cells in this layer start to swell thus slowing the carry of nutrients between the tree and leaf. Immediately the abscission zone is blocked, a tear line shapes and moves downwards, until finally the leaf is blown away or falls off.

Trees possess an inner clock which is triggered by the length of the daylight. The shrinking daylight in autumn activates it, and the trees will lose their leaves even in the warmest falls.

How many red berries can you find amongst the leafs?