Leaves Tissues Chlorophyll Canopy Sun vs Shade Leaves

Leaves Tissues, Chlorophyll, Canopy, Sun vs. Shade Leaves

Why are leaves green ? ? https: //www. youtube. com/watch ? v=a. AQYpra 4 a. Us Yes, the chlorophyll appear green… but why ? ?

Leaf Tissue Cuticle Water –repellent layer v Releases Waxes v Limiting evaporation of water v

Leaf Tissue Epidermis External layer v One cell thick v Form an extra- thick cell wall v

Leaf Tissue Stomata An open pore (stomatal pore) in the epidermis surrounded by guard cells v Found on the lower epidermis on the bottom of the leaf v

Leaf Tissue Stomata v Mechanism: Guard cells open to let in CO 2 and moisture for photosynthesis and release Oxygen ü Guard cells are closed at night or when it is hot – no gas exchange , but it saves the plant from loosing water ü

Leaf Tissue Mesophyll v Cells making up the internal leaf tissue Palisade mesophyll ü Spongy mesophyll ü

Leaf Tissue Palisade Mesophyll Upper layer of elongated cells v Contains chloroplasts v Specialized for gas exchange v

Leaf Tissue Spongy Mesophyll Lower layer of irregular shaped cells v Contains large air spaces v Specialized for gas exchange v

Leaf Tissue Vascular bundles Visible veins of the leaf which connect through the petiole to the vascular tissue of the stem v Made up of Xylem and Phloem tubes, transporting water and food v