Plant Parts (Leaf Blade and Petiole)

Blade and Petiole

This picture shows a leaf blade and petiole. The blade is the main part of the leaf. The structure of the leaf blade relates to its function. The blade functions in photosynthesis but it also releases water through its stomata. Therefore, plant has to alter its leaf shape depending on its metabolic need for water and its environment. (2)

The petiole attaches the blade to the stem of the plant. The petiole has the same internal structure as the stem so it has similar functions. The petiole functions in storage, connection, and the movement of water and minerals. (1)

Citations:

1. "Petiole (botany)." Wikipedia. Wikimedia Foundation, 18 Apr. 2012. Web. 19 Apr. 2012. <http://en.wikipedia.org/wiki/Petiole_(botany)>.


2. "Leaf." Wikipedia. Wikimedia Foundation, 04 Dec. 2012. Web. 19 Apr. 2012. <http://en.wikipedia.org/wiki/Leaf>.