Question

this assignment booklet is worth 68 marks out of the total 123 marks for the assignments in unit d. the value of each assignment and each question is stated in the left margin. read all parts of your assignment carefully, and record your answers in the appropriate places. if you have difficulty with an assignment, go back to the textbook and review the appropriate lesson. be sure to proofread your answers carefully before submitting your assignment booklet. chapter 1 assignment: the biosphere of life for questions 1 to 5, read each question carefully. decide which of the choices best completes the statement or answers the question. place your answer in the blank space given. 1. an ecosystem includes a. non - living (abiotic) components only b. living (biotic) components only c. both biotic and abiotic components d. physiographic components only 2. when an angler decides to fish using a particular type of fly in a shaded part of a lake or stream, she demonstrates her understanding of a. abiotic factors b. biotic factors c. stream ecosystems d. all of the above 3. the soil in a flower pot, the amount of water added to the pot, the amount of sunlight received by the plant, the amount and type of fertilizer given, and the temperature of the air surrounding the pot all make up the plants a. abiotic factors b. biotic factors c. ecosystem d. habitat 4. a rapid algal bloom can harm an aquatic ecosystem because a. algae deplete the oxygen in the water b. decomposing dead algae deplete the oxygen in the water c. an extensive algal bloom blocks the sunlight for other organisms in the water d. all of the above 5. the petroleum industry only uses 1% of the available fresh water in alberta for oilfield injection, while farmers use 47% for irrigation. why are many citizens opposed to this use of water by the petroleum industry but are not concerned with this use of water for irrigation? a. the petroleum industry has lots of money. b. food produced by irrigation is more vital than the oil produced by the petroleum industry. c. water used by the petroleum industry is injected deep underground and does not return to the hydrological cycle. d. farming is more important to the province than the petroleum industry is.

Explanation:

1. An ecosystem is defined as a community of living organisms (biotic) interacting with non - living (abiotic) components. So, it includes both.
2. The shaded part of a lake or stream (abiotic - light), the type of fly (biotic - bait) are factors. Stream ecosystems are also relevant as the fishing is in a stream or lake (a type of ecosystem).
3. Abiotic factors are non - living. Soil, water, sunlight, fertilizer, and temperature are all non - living components related to the plant's living conditions (habitat).
4. Algae consume oxygen (during respiration), decomposing dead algae also consume oxygen (by decomposers which are aerobic in most cases), and an extensive bloom can block sunlight (affecting photosynthetic organisms).
5. Water used for irrigation is used to grow food (vital for survival), while water used in the petroleum industry (injected underground and not in the hydrological cycle easily) is seen as a less essential use.

Answer:

1. C. both biotic and abiotic components
2. D. all of the above
3. D. habitat
4. D. all of the above
5. C. Water used by the petroleum industry is injected deep underground and does not return to the hydrological cycle.