Photosynthesis tends to increase as the concentration of carbon dioxide increases. How much depends on the photosynthetic pathway exhibited by the plant (C3, C4, or CAM). Here is an introduction to this issue, using photosynthetic carbon dioxide response curves.
The leaves of deciduous trees change colors in the autumn in many temperate places, often turning vibrant colors of yellow, orange, and red. This video describes the physiological mechanisms regarding how and why this color change takes place.
The wood of trees contains a complex mixture of different cell types that do all sorts of interesting things. This video introduces the rays, which provide hydraulic capacitance and carbohydrate storage capacity in trees.
The leaves of plants respond dynamically to variation in light. Photosynthesis tends to increase as light increase, but by how much? This video describes the photosynthetic light response curve and how it differs for sun and shade leaves.
An amazing structure in the wood of trees that allows conifers to grow tall- the protected pit. This is a lightboard short video describing how the margo and torus provide protection within the pits of gynosperm tracheids. That is, water moves through the wood of conifer trees through pits between adjacent tracheids, and these pits have an amazing valve built into them, comprised of the margo and the torus.