Science 10 Assignment U3L7 (31 marks)
1. Draw (or copy and paste from the internet) a cross section of a leaf and label
the upper and lower epidermis, palisade tissue, spongy mesophyll tissue, and
choloroplasts. (5 marks)
2. Describe the functions of the following leaf structures. (6 marks)
a) epidermis
b) guard cells
c) palisade tissue
d) spongy mesophyll tissue
e) xylem tissue
f) phloem tissue
3. What is the function of the stomata ? (1 mark)
4. Describe circumstances that would affect the number of stomata. Explain
your answer (2 marks)
5. Explain why the palisade cells are tightly compacted while the spongy
mesophyll cells are more loosely organized. (2 marks)
6. Identify two environmental stresses that would cause stomata to close.
Provide an explanation for each response. (4 marks)
7. What is the advantage of having the palisade tissue directly below the upper
epidermis? (1 mark)
8. Name and describe each of the organ systems in plants. Provide a diagram that
illustrates your description. (10 marks)