Three marks define the term biogeochemical cycles

c) When finished answering all your questions, save your file and upload the file into the appropriate dropbox.

Part A (Using the Concepts): Multiple Choice: (60 marks)Each question is worth different marks according to the strategy used. If calculations are required, the mark for the strategy will worth more marks and the final answer will be worth one mark.

a. nitrogen fixation, nitrification, denitrification, assimilation, ammonification b. nitrogen fixation, nitrification, ammonification, assimilation, denitrification c. nitrogen fixation, nitrification, assimilation, ammonification, denitrification d. nitrification, nitrogen fixation, ammonification, assimilation, denitrification

____ 16. (two marks) When farmers use chemical fertilizers, which matter cycle(s) is/are they part of?

____ 18. (two marks) Which of the following are used as defense against predators by animal prey species?

a. poison b. mimicry

	c. chemical defence d. safety in numbers

____ 20. (two marks) Polar bears kill and eat seals. What type of relationship is this?

a. protective colouration
b. camouflage		d. commensalism
____ 22. (two marks)	Farms try to grow large numbers of domesticated crops in an area where native species used

a. competition b. predation	c. parasitism d. both b and c

SBI 3C1 Lesson Assignment Page 4

a. mutualism c. a defence mechanism b. commensalism d. both b and c

31. (three marks) Define the term biogeochemical cycles, as used by ecologists

32. (two marks) Identify the two power sources of the water cycle.

36. (four marks) Distinguish between the terms habitat and niche.

37. (four marks) Define the term commensalism and explain why some ecologists argue that this relationship does