Tests generally begin with straight forward questions that assess


Question Description:

35

Tests generally begin with straight forward questions that assess Knowledge and Understanding and which most students should be able to answer correctly. Various types of organism, including native bushes, insects, small birds, and lizards, live in the shrubbery in a suburban backyard. These organisms together make up J a community. K an ecosystem. L a population. M a habitat. An ecologist describes an area of bushland as a ‘red river gum community’. Questions such as this allow students the opportunity to demonstrate their Application of appropriate biological terminology. The term ‘red river gum community’ refers to all the J organisms living on a single red river gum tree. K river red gum trees in the area of bushland. L organisms in the area of the bushland. M living and non-living components in the area of bushland. The soil contains many different microorganisms, such as bacteria and fungi. The soil microorganisms are important in a community because they J are the primary source of food for many plants. K return resources to the community. L decompose all pollutants. M are part of the first trophic level of food chains. The productivity J of a community could be measured in grams per square metre. K is highest in the community that has the most organisms. L of a community is partly dependent on temperature. M of any community is constant throughout the year. Refer to the following diagram of a food web: Questions such as this which require the selection of an incorrect alternative may be more demanding than those requiring the selection of a correct alternative. Which one of the following statements is incorrect? J. Frill-necked lizards and dingoes belong to different trophic levels. K. Gum trees and native grasses are both in the first trophic level. L. Koalas and desert hopping mice belong to the same trophic level. M. Brown snakes belong to both the third and the fourth trophic levels. Refer to the following diagram, which shows the fertility of the offspring produced when three populations of frogs A, B, and C, interbreed. Which one of the following statements about populations A, B, and C is consistent with the information in the diagram above? A, B, and C are three different species. A and B are different species, but B and C are the same species. B and C are different species, but A and B are the same species. A and C are the same species, but A and B are different species. Which one of the following statements about communities is correct? J The mass of living organisms in successive trophic levels usually decreases. K The number of living organisms in successive trophic levels is the same. L Most of the energy at each trophic level is used for the production of new tissues. M Most of the energy at each trophic level is passed on to the next trophic level. Questions such as this are challenging because they require students to connect two or more ideas and carry out some problem solving. Correctly answering the question provides evidence of Knowledge and Understanding at an A level. Kelp is a marine algae, which grows about 1metre in height and lives for about 10 years. Kelp forests, which are found in temperate waters such as those off the coast of Adelaide, provide a habitat for fish. The kelp forests are being destroyed by stormwater discharged from metropolitan Adelaide into the coastal waters. The stormwater contains high levels of nutrients such as nitrogen and phosphorus compounds and high levels of sediment. ‘Turf-forming’ species of algae, which grow to less than 5 millimetres in height and live for about 1 year, are replacing the kelp forests. Which one of the following statements is consistent with the information above? J The impact of high levels of sediment on the kelp forests is greater than the impact of high levels of nutrient. K The discharge of stormwater results in an increase in the population of K- selected species. L A reduction in fishing off the coast of Adelaide would result in the re-e

Answer

35