Bio Lab Wksht & HW Questions 64

Bio Lab Wksht & HW Questions 64 - surface The xylem...

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59 a. Note that there is an upper and lower surface to the leaf. The epidermis is the outer most layer on both surfaces of the leaf. Sometimes there is a waxy covering on the epidermis. What is the purpose of this waxy covering? Look for gaps in the epidermis. Each gap is enclosed by two cells called guard cells . The gaps are called stomata . What is their function? b. Sandwiched between the epidermal layers are parenchyma cells that contain chloroplasts and are actively involved in photosynthesis. Are all of the parenchyma cells in the leaf tightly packed together? What separates them? Why? c. Vascular tissue consisting of xylem and phloem appears as circular bundles in the middle area of the leaf. The xylem is generally closer to the upper epidermis and the phloem is closer to the lower epidermal
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Unformatted text preview: surface. The xylem cells are stained red and have much thicker walls than the blue stained, thin-walled phloem cells. ROOTS Roots function to anchor the plant and to absorb water and nutrients. Some roots are also important storage organs. Can you think of an example of a root whose major function is storage? The root is the first organ to emerge from the germinating seed. The actively growing and dividing region in the root, the meristem , is located near the root tip, just behind the root cap . As growth and development progress, the main (primary) root elongates and lateral roots that originate endogenously (within the main root), are formed in the region well behind the actively growing root tip....
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