7 th Grade Pre-Post Test Science

Question 1 A student observing the sky notices that the cirrostratus clouds she saw in the morning have been replaced by cumulonimbus clouds in the afternoon. What weather conditions can she expect for the afternoon and evening? A. low clouds and fog with little temperature change B. fair skies continuing with scattered puffy clouds C. light rain, then an increase in temperature and clearing skies D. heavy wind and rain followed by a drop in temperature and clearing skies

Question 2

3. Which sequence correctly shows the order from simplest to most complex in multicellular organisms?

4. The primary source of energy for most living things is A.PlantsC. Food B.Sun D. AMP’s

5. What is the relationship between tissues and organs? A. Organs are made from one type of tissue. B. Tissues are made from one type of organ. C. Tissues are made from different types of organs. D. Organs are made from different types of tissues.

6. In a multicellular organism such as a fish, which of these items is composed of all the others? A. Tissues C. Cell structures B. Organs D. Organ systems

7. This cellular process converts light energy from the sun into chemical energy that organisms use for life functions. A. Respiration, in which oxygen is used and carbon dioxide is given off. B. Fermentation, in which sugar is broken down and alcohol is given off. C. Digestion, in which starch is broken down into simple sugars. D. Photosynthesis, in which carbon dioxide is used and sugars are produced.

8. These two plant cell structures are responsible for storing energy from sunlight and later releasing it for cells to use. A. Chloroplast and nucleus B. Mitochondrion and cell wall C. Chloroplast and mitochondria D. Nucleus and cell wall

9. Which cell structure carries out a function for a cell that is similar to the function that bark carries out for a tree? A. Cell WallB. Nucleus C. ChloroplastD. Mitochondrion

Question 10 A meteorologist collects data on the weather conditions at an airport. The diagram shows a weather station model of the data that he collected.

At the time these data were collected, flights at the airport were delayed. According to this information, which weather condition caused the delay? A. thick fog B. heavy snow C. freezing rain D. strong winds

Question 11 The sun is a mid-sized, main sequence star. What stage is next in the life cycle of the sun? A. red giant B. black hole C. white dwarf D. neutron star

Properties of Some Substances – Use this chart for questions A scientist measures out 15 mL each of baking soda, salt, sugar, iron filings, and corn starch. She runs a series of procedures and records her results in the table below. The first column in the table indicates the procedure. The remaining columns indicate her results for each substance.

Question 12 According to the information in the table, what comparison can the scientist make about the densities of sugar and corn starch? A. Sugar is more dense than corn starch. B. Corn starch is more dense than sugar. C. Sugar and corn starch have the same density. D. Both sugar and cornstarch are more dense than salt.

Question 13 The scientist observes the rust on the sample of iron filings and dries the sample thoroughly. The scientist weighs the entire sample and finds that it has more mass than the original 118 grams. What explains this increase in mass? A. The sample gained mass during drying. B. The sample gained mass during a physical change. C. The sample gained mass during a change of state. D. The sample gained mass during a chemical change.

Question 14 What two changes does sugar undergo when heated in a spoon over a flame? A. two physical changes B. two chemical changes C. a chemical change and then a physical change D. a physical change and then a chemical change

Question 15 The moon orbits the Earth about every A. 28 days B. 31 days C. 24 days D. 60 days

Use the water cycle diagram to answer questions 16-19

Question 16 What evidence suggests that water goes through a physical change when it evaporates in the water cycle? A. The density of the water remains the same. B. The volume of the water remains the same. C. The physical properties of the water remain the same. D. The chemical properties of the water remain the same.

Question 17 The diagram includes an ocean in the water cycle. How does salt water from the ocean end up as fresh water in precipitation? A. Runoff leaves salt in the soil. B. Precipitation leaves salt in the clouds. C. Evaporation leaves salt in the ocean. D. Condensation leaves salt in the water vapor.

Question 18 What is the primary energy source that drives Earth’s water cycle between the atmosphere, oceans and land? A. wind B. sunlight C. ocean currents D. rotation of Earth

Question 19 Water gains energy during evaporation. During what process in the water cycle is this energy released? A. percolation through soil B. transpiration from plants C. runoff into the lake and ocean D. condensation that forms clouds

Question 20 – short answer. Sea otters are marine mammals that live in giant kelp forests along the Pacific coast of North America. Sea otters have an important role in the food web of this ecosystem. When sea otters are removed from the giant kelp forest, the kelp also begins to disappear.

In your Answer, explain why the absence of sea otters would lead to a decrease in the giant kelp. Then, choose another organism in the food web and explain why the decreasing amount of giant kelp would affect that organism. (2 points)