Living Environment - June 2010

36 Which level includes organisms that get their energy exclusively from a source other than the
organisms in this ecosystem?

(1) A   (3) C
(2) B   (4) D

37 The chart below compares the size of three structures: a gene, a nucleus, and a chromosome.

Based on this information, structure A would most likely be a

(1) chromosome that is part of structure C
(2) chromosome that contains structures B and C
(3) nucleus that contains both structure B and structure A
(4) gene that is part of structure B

38 The diagram below shows molecules represented by X both outside and inside of a cell.

A process that would result in the movement of these molecules out of the cell requires the use of

(1) DNA     (3) antigens
(2) ATP     (4) antibodies

39 Which statement most accurately predicts what would happen in the aquarium shown below if it
were tightly covered and maintained in natural light for one month?

(1) The water temperature would rapidly decrease.
(2) The process of respiration in the snail would decrease.
(3) The rate of reproduction of the fish would be affected.
(4) The organisms would probably survive because materials would cycle.

40 The data table below shows an effect of secondhand smoke on the birth weight of babies born to husbands and wives living together during pregnancy.

Click on image to enlarge

Based on these data, a reasonable conclusion that can be drawn about secondhand smoke during pregnancy is that secondhand smoke

(1) is unable to pass from the mother to the fetus       (3) causes mutations in cells of the ovaries
(2) slows the growth of the fetus                               (4) blocks the receptors on antibody cells

41 A limiting factor unique to a field planted with corn year after year is most likely

(1) temperature     (3) water
(2) sunlight            (4) soil nutrients

Base your answers to questions 42 and 43 on the information below and on your knowledge of biology.

After the Aswan High Dam was built on the Nile River, the rate of parasitic blood-fluke infection doubled in the human population near the dam. As a result of building the dam, the flow of the Nile changed. This changed the habitat, which resulted in an increase in its population of a certain aquatic snail. The snails, which were infected, released larvae of the fluke. These larvae then infected humans.

42 This situation best illustrates that

(1) the influence of humans on a natural system is always negative in the long term
(2) the influence of humans on a natural system can have unpredictable negative impacts
(3) human alteration of an ecosystem does not need to be studied to avoid ecological disaster
(4) human alteration of an ecosystem will cause pollution and loss of finite resources

43 The role of the snail may be described as a

(1) host           (3) producer
(2) parasite      (4) decomposer

For Parts B2,C, D click on PDF version

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