When observing a stem of coconut trees during sunshine,how the light cannot pass through the leaves of the coconut tree even though it is thin and it form shadow, whereas the stem allows the light to pass through them but their stem is thick and how possible this could be??

The ability of light to pass through an object depends on its transparency, thickness, and composition. In the case of coconut trees, the leaves appear to block the light, creating shadows, while the stem allows light to pass through.

Coconut tree leaves are not transparent, meaning they do not allow light to pass through easily. The leaves are made up of multiple layers of cells that contain pigment molecules, such as chlorophyll, which give them their green color. These pigment molecules absorb and scatter the incoming light, preventing it from passing through the leaves. As a result, the light is either absorbed by the leaves or reflected off their surfaces, creating shadows.

On the other hand, the stems of coconut trees appear to let light pass through. The stem is made up of fibrous tissue that is highly organized. The fibrous structure allows light to pass through the gaps between the fibers, without being fully absorbed or scattered. Additionally, the stem tissue does not contain as many pigment molecules as the leaves, which contributes to its higher transparency.

It is important to note that even though the stem of a coconut tree allows some light to pass through, it is still relatively thick compared to other plant stems. This means that some light is absorbed or scattered as it passes through the stem, resulting in a slightly reduced intensity of light on the other side.

In summary, light cannot easily pass through the leaves of a coconut tree due to their non-transparent composition and the presence of pigment molecules that absorb and scatter light. On the other hand, the stem of the coconut tree, although thick, allows light to pass through due to its fibrous structure and lower concentration of pigment molecules.