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UNIT
B SELF-QUIZ
for each question select the best answer from the four alternatives
1 What are producers able to do that consumers cannot (24) KU
(a) cycle energy in ecosystems(b) make their own food(c) release energy from food (d) generate thermal energy
2 Th e unique way a species interacts with other species and with its environment is called (25) KU
(a) a trophic level(b) a feeding role(c) an ecological niche(d) a food chain
3 Which of the following is an example of a biotic factor (22 27) KU
(a) sunlight(b) grass(c) soil(d) water
4 Which of the following is true about pesticides (44 45) KU
(a) Pesticides are toxic only to the target species
(b) Pesticides tend to reduce overall food production
(c) Pesticides are used to replace nutrients in soil
(d) Pesticides can pass from an organism to its consumer
Indicate whether each of the statements is true or false If you think the statement is false rewrite it to make it true
5 Primary succession occurs in an ecosystem that has been partially disturbed by an event such as a forest fi re (32) KU
6 Fragmentation of an ecosystem occurs when the ecosystem is divided into smaller parcels making it more sustainable (34) KU
7 A threatened species is a species that may become endangered if current trends continue (33) KU
Copy each of the following statements into your notebook fill in the blanks with a word or phrase that correctly completes the sentence
8 Groundwater can become contaminated with nitrogen compounds from fertilizers through a process called (42) KU
9 An environment and all its organisms form a(n) (22) KU
Match each term on the left with the most appropriate description on the right
10 (a) producer (i) the feeding position of an organism along a food chain
(b) consumer (ii) an organism that obtains energy by eating other organisms
(c) decomposer (iii) a network of feeding relationships within a community
(d) food chain (iv) an organism that obtains energy by eating dead organic matter
(e) food web (v) an organism that obtains energy by making its own food
(f) trophic level (vi) a sequence of organisms each feeding on the next (24 25) KU
Write a short answer to each of these questions
11 List three examples of products we obtain from terrestrial ecosystems (31) KU
12 Explain the diff erence between a population and a community (22) KU
13 Predation and parasitism are two examples of species interactions (27) KU
(a) How are predation and parasitism alike (b) How are they diff erent
164 Unit B bull Sustainable Ecosystems NEL
6646_Sci9_ch04_pp148-165indd 164 71709 60804 PM