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8th Grade Science Check 3
8th grade Science Check 3
Ms. Lindsey, Beat Four
Ms. Merritt, Buckatunna
Ms. Cochran, Clara
Ms. Harrison, Waynesboro Middle
Ms. Chapman, Waynesboro Middle
Jared investigated chemical reactions based on smell, color change, and release of bubbles. What type of evidence would support any conclusion Jared makes?
Sean is studying the advantages of selective breeding in plants. He made the following list of possible advantages: 1) Can produce corn that attracts grasshoppers 2) Can develop grass that can grow with less water 3) Can develop wheat that can grow in different types of soil 4) Can produce oranges that are not affected by freezing temperatures. Which items on the list provide logical arguments in favor of selective breeding?
2, 3, 4
How can the wavelengths of light from a distant galaxy be used to determine the distance between Earth and the galaxy?
The color of light from a galaxy indicates the age of the galaxy, and the most distant galaxies are the oldest.
The light from distant galaxies shows a shift to longer wavelengths, and the shift increases as the distance increases
The light from a distant galaxy is scattered by dust in the space between Earth and the galaxy, and the amount of scattering indicates distance
The most distant galaxies emit the most light in the x-ray part of the spectrum, and the distance can be determined based on the strength of this light.
Scientists want to create citrus trees that are tolerant of cold weather. Currently, if the fruit from a citrus tree has not been picked and a freeze occurs, the fruit is damaged and cannot be sold. The scientists are studying how to alter the tree's cells so that they are not damaged by the freezing temperatures. Which of these is a logical reason for continuing this research?
Plants that can tolerate the cold would be less likely to become infected by fungi
Plants that can tolerate the cold could allow citrus trees to grow in colder climates
The research could make it easier to preserve the picked fruit during storage and shipping
The research could help scientists alter human cells so that human skin is not damaged by frostbite.
Tinea pedis is a disease caused by a fungus. It affects mainly external body parts and not internal systems. Which of these could be a symptom of tinea pedis?
Pain in the intestines
Headache and dizziness
Swollen and itching skin
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