Homework for the week of March 29-April 1. A. Step 1. B. Step 4. C. Step 2. D. Step 3.

Transcription

1 Name *Use a highlighter to highlight key words in the question. Homework for the week of March 29-April 1 1. Pedro thinks that if he adds earthworms to a compost pile, it will decompose twice as fast as a compost pile without earthworms. Which of the following experiment steps would make it difficult for Pedro to compare the compost in a pile with earthworms to the compost in a pile without earthworms? 1. Start two compost piles at the same time with the same materials. 2. Add earthworms to one compost pile. 3. Add fungi to the other compost pile. 4. Judge the level of decomposition in each compost pile every week. 5. Report the results. A. Step 1. B. Step 4. C. Step 2. D. Step Look at the hammer below. In which of the following ways could its design be improved? A. Make it completely out of wood to make it lighter to carry. B. Remove the handle to make it more portable. C. Make it completely out of Styrofoam so that it makes less noise. D. Add a rubber grip around its handle to make it easier to hold.

2 3. Which of the following are methods of scientific investigation? A. observing something B. giving a questionnaire C. doing an experiment D. all of these 4. Which side of the ruler above measures in metric units? A. both side A and side B B. side A C. side B D. neither side A nor side B

3 Name Background Date Accomplishment Si Ling-Chi Empress of China 2640 B.C. Develops process to cultivate silkworms for silk Susrata Indian surgeon 500 B.C. Performs operation to remove eye cataracts Ibn al Haytham Arab physicist 1010 Discovers that vision is caused by the reflection of light from objects into eye George Washington Carver African-American agricultural scientist Early 1900s Develops several hundred industrial uses for peanuts, sweet potatoes and soybeans Marie Curie French physicist born in Poland 1903 Awarded Nobel Prize for investigations into radiation Alexander Fleming Scottish bacteriologist 1928 Discovers penicillin-the first antibiotic able to be manufactured Rosalind Franklin English geneticist 1951 Photographs DNA and describes its shape 5. Where was the woman who investigated radiation from? A. Scotland B. India C. France D. China 6. William has noticed that most plants are green. He wants to know why. Which of the following is a testable question that William could ask about the color of plants? A. Why aren't most plants orange? B. Why aren't animals green? C. What would plants look like if they were not green? D. What part of a plant cell gives the plant its green color? 7. A is a type of lab equipment used to heat substances. It has a flat platform where a beaker containing a liquid can be placed. When it is turned on, the platform heats up, causing the beaker and liquid to heat up. A. Bunsen burner B. hot plate C. microscope D. barometer

4 8. Penguins are extremely well adapted to swimming in water at fast speeds. Penguins can swim as fast as 40 km/h underwater. Scientists have many times found that by looking at nature, they can develop better technology. What type of technology could the study of penguins improve? A. submarine technology B. buoy technology C. cruise boat technology D. scuba diving technology 9. Mike is doing a laboratory experiment. The experiment's materials list says that Mike needs to have a balance. What will Mike most likely need to do during the experiment? A. measure the temperature of something B. measure the length of something C. measure the volume of something D. measure the mass of something 10. Tamara and Tyler are both interested in studying birds. Tamara goes to the park and uses her notebook to record the number and colors of birds that she sees there. Tyler designs a plan to test what kind of birdseed the birds at the park eat the fastest. What kind(s) of scientific investigation are Tamara and Tyler doing? A. Tamara and Tyler are both using observation to study birds. B. Tamara is doing an experiment, whereas Tyler is using observation. C. Tamara and Tyler are both doing experiments on birds. D. Tamara is using observation, whereas Tyler is doing an experiment.

5 11. Diana is performing an experiment in which she must separate a mixture. The mixture contains sand and iron filings. Which of the following tools should Diana use to help her separate the mixture? A. graduated cylinder B. magnet C. balance D. funnel Name Background Date Accomplishment Si Ling-Chi Empress of China 2640 B.C. Develops process to cultivate silkworms for silk Susrata Indian surgeon 500 B.C. Performs operation to remove eye cataracts Ibn al Haytham Arab physicist 1010 Discovers that vision is caused by the reflection of light from objects into eye George Washington Carver African-American agricultural scientist Early 1900s Develops several hundred industrial uses for peanuts, sweet potatoes and soybeans Marie Curie French physicist born in Poland 1903 Awarded Nobel Prize for investigations into radiation Alexander Fleming Scottish bacteriologist 1928 Discovers penicillin-the first antibiotic able to be manufactured Rosalind Franklin English geneticist 1951 Photographs DNA and describes its shape 12. Look at the above chart. All of the individuals discussed in the chart have done important scientific work. Using them as examples, what can you generalize about scientists? A. Scientists have lived only in this century. B. Scientists are only men. C. Scientists only come from Europe. D. Scientists can be any gender or nationality. 13. A scientist studying lizards observes that they run faster on the day he feeds the lizards vitamins with their meals. What hypothesis could explain why the lizards are performing better? A. Vitamins make the lizards tired. B. Lizards should only eat vitamins, not food. C. Vitamins give the lizards more energy. D. Lizards like the taste of vitamins.

6 14. Marissa needs to pour water from a wide beaker into a narrow graduated cylinder. What type of tool can she use to help her pour the water without spilling? A. a magnet B. a funnel C. a hot plate D. a test tube 15. When an architect plans to build a house that uses the Sun for heat, what should be his first step? A. to start landscaping the area around the house site B. to create a design plan for the house using small drawings C. to begin building the actual house based on past experience D. to build a full scale test house to confirm measurements 16. Rebecca is conducting an experiment to see if the height of a ramp affects the speed at which a marble rolls down the ramp. What should be the only variable in Rebecca's experiment? A. the height of the ramp B. the point from which the marble is released C. the type of marble D. the material the ramp is made of 17. Objects that conduct electricity can easily carry an electrical charge. Which of the following materials best conducts electricity? A. plastic tubing B. rubber sheets C. copper wire D. cotton string

7 18. Which of these is required to make a circuit? A. static electricity B. a closed loop C. two lightbulbs D. two batteries 19. What type of energy transfer happens when you turn on a light bulb? A. Electrical energy is transformed into light energy. B. Potential energy is converted into kinetic energy. C. Mechanical energy is converted into kinetic energy. D. Electrical energy is transformed into heat and mechanical energy.

8 20. Two bulbs are connected to a battery in a series circuit. Both bulbs are lit. A few minutes later, one of the bulbs burns out. What will happen to the other bulb? A. The other bulb will glow more brightly because the amount of electricity it receives will increase. B. The other bulb will remain lit at the same brightness. C. The other bulb will no longer be lit because the circuit will be incomplete. D. The other bulb will remain lit but will not glow as brightly. 21. Electrical energy can produce many other types of energy. When electricity runs through a stereo, what other type of energy is produced? A. light energy B. sound energy C. kinetic energy D. mechanical energy 22. Irene is working on a series circuit for her science lab class. The circuit she is using consists of a battery, a light bulb, and a switch. When Irene flips the switch, the light bulb lights up. What did the switch do for the circuit? A. The switch produced the electricity for the circuit. B. The switch provided light energy to the bulb. C. The switch had no effect on the circuit. D. The switch completed the circuit.