8th Grade Science - STAAR April 2014 Part 1
Quiz by Mark Dunk
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- Q 1/5Score 0This diagram models Mercury and Venus orbiting the sun. What force causes Venus to travel along a curved path instead of moving in a straight line as indicated by the dashed line in the diagram?29Electromagnetic attraction between Mercury and VenusElectromagnetic attraction between the sun and VenusGravitational attraction between the sun and VenusGravitational attraction between Mercury and Venus
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- Q1This diagram models Mercury and Venus orbiting the sun. What force causes Venus to travel along a curved path instead of moving in a straight line as indicated by the dashed line in the diagram?Electromagnetic attraction between Mercury and VenusElectromagnetic attraction between the sun and VenusGravitational attraction between the sun and VenusGravitational attraction between Mercury and Venus45s
- Q2Before the Industrial Revolution in England, the peppered moth was commonly found on tree trunks that had light-colored lichen on the bark. Most of the peppered moths were a light gray-brown color similar to that of the lichen. A few of the moths had a mutation that made them a dark gray-brown color. During the Industrial Revolution, coal-burning factories produced black soot that covered the trees and killed the lichen in and near cities. In these areas the number of dark peppered moths increased, while the number of light peppered moths decreased. What contributed to this change?The soot-covered trees camouflaged the dark moths.The dark moths preyed on the light moths.Bird populations increased in the areas near the factories.The dark moths laid fewer eggs than the light moths.120s
- Q3Many processes occur in the digestive system. Which process is best classified as a physical change?Teeth grinding an almond into smaller pieces in the mouthDigestive enzymes breaking down proteins into smaller fragmentsSaliva converting the starch molecules in crackers into simple sugarsBacteria converting lactose into simple sugars in the intestines45s
- Q4Please refer to this Hertzsprung-Russell diagram. Based on this diagram, which type of stars would belong to spectral class M and have the highest luminosity?GiantsMain-sequence starsSupergiantsWhite dwarfs60s
- Q5Which of these correctly describes a relationship between organisms in this soil food web?Bacteria get nutrients from organic matter.Mammals are predators of birds.Nematodes prey on arthropods.Protozoa get nutrients from small arthropods.120s
