Part C


10. Observe a prepared slide of a lilac leaf, Syringa, shown below, under low power, and find the lower epidermis.

Syringa leaf (S30X)

11. Identify the stomata on the lower epidermis of the lilac leaf. Find the guard cells that open and close a particular stoma. Locate an open stoma and a closed stoma. Draw and label diagrams of the stomata and the guard cells in your lab report.

12. Look at the center part of the cross section. Note the spongy texture of the mesophyll layer. Locate a vein containing xylem and phloem. Now identify the palisade layer, the upper epidermis, and finally the clear, continuous, noncellular layer on top. This layer is called the cuticle. Draw and label a diagram of your observations in your lab report.

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