Make 3 careful drawings of the following lab specimens and answer the following questions . Draw each specimen in colour and in a circle made by a petri dish. Label the drawing and state the magnification.
1. Use the DISSECTING MICROSCOPE which has 2 ocular lenses and where the maximum magnification is 10x4 = 40x. Observe moss under the microscope. Draw this specimen carefully in colour.
2. Moss questions:
a. Does this plant use INTERNAL or EXTERNAL FERTILIZATION? Give evidence for your answer.
b. This plant has many similarities with marine autotrophs like seaweed. Explain 2 similarities to seaweed and 2 differences, especially as they relate to reproduction,
c. Use the internet to help you with this question: Is moss sexually dimorphic? Explain how you can identify female vs male moss.
3. Use the LIGHT MICROSCOPE which has 1 ocular lens and 3 or 4 objective lenses. Observe Human Sperm and rodent testis specimens under the highest magnification: 10 x 40x = 400x
4. Human Sperm questions:
a. What are the 3 parts of human sperm?
b. Explain the function of each of the 3 parts.
c. What is the optimal temperature for sperm production in humans?
d. Where is the location of sperm production?
5. Rodent Testis questions:
a. What structures are you observing in this specimen?
b. Where would the Sertoli cells be most likely to be located in your drawing?
c. Where would the spermatids be most likely to be located in your drawing.
d. Write the path of sperm starting at the seminiferous tubules and ending at the urethra. Name all the parts of the body that the sperm passes on its way.
30 marks for the drawings and questions.
