Sixth Grade Science BLOCK 2 ASSESSMENT Simple Organisms 2008-09 Directions: Choose the best answer for each question. Then mark your choice on your answer sheet. 1. Which of the following best describes where microorganisms live? A) Dark, cold places B) Nearly everywhere C) Sunny, dry places D) Underwater 4. Which statement is true of ALL bacteria? A) All bacteria are producers. B) All bacteria are single-celled organisms. C) All bacteria have a cell with a nucleus. D) All bacteria live in water. 2. Bacteria are classified by. A) color. B) shape. C) size. D) where they live. 3. Which of the following correctly describes the size of fungi compared to the size of bacteria? 5. Raquel placed a jar of water containing Euglena, a green plant-like protist, in a sunny window. She placed a black covering over one-half of the jar. What do you think she will observe when she returns in one hour to observe the water samples with a microscope? A) She will find Euglena equally throughout the jar. B) She will find more Euglena at the bottom of the jar. C) She will find more Euglena in the side of the jar in the dark. D) She will find more Euglena in the side of the jar in the light. A) Bacteria are larger. B) Fungi are larger. C) They are about the same size. D) They are the same size but different shapes. 1
Cilia 6. What is the function of cilia? A) To control cell division B) To make food from sunshine and air C) To move the paramecium D) To take in water and remove waste 7. How do bacteria help our bodies function? A) They make our muscles and lungs stronger. B) They help carry oxygen through our blood. C) They help to digest food in the intestines. D) They make our skin flexible and clean. 8. Helpful bacteria can do all of the following EXCEPT. 9. What do we call organisms that obtain food by feeding on dead or decaying organisms? A) Algae B) Decomposers C) Flagellate D) Parasites 10. How does adding yeast change bread dough? A) Yeast causes bubbles of gas to form in the dough. B) Yeast makes the dough flexible and clean. C) Yeast changes the bread s color. D) Yeast results in no change to the dough. 11. Of these foods, which was NOT produced with the help of bacteria? A) Cheese B) Milk C) Pickles D) Yogurt A) digest dead organisms. B) help clean up soils. C) make medicines. D) preserve canned food. 2
12. An antibiotic is a drug used to kill. A) bacteria. B) colds. C) fungus. D) viruses. 15. Which of the following would provide the most detailed view of bacteria? A) 13. What has been the greatest benefit of discovering the fungus penicillium? A) Better cancer treatments B) Improving crop yields C) Development of an important antibiotic D) Production of better tasting mushrooms B) C) D) 14. Which statement best describes pasteurization? A) Pasteurization is a process of heating food to a high enough temperature to destroy harmful bacteria. B) Pasteurization is a process of heating fruit juices so that they can retain their flavor even after they are packaged. C) Pasteurization is a process used by dairy farmers to make sure the fat in milk does not separate. D) Pasteurization is the process used to treat people suspected of having rabies. 3
The 6 th grade students were each given an assignment to prepare an experiment on microorganisms at home that they could share with the class. Part of their assignment was to write about their experiment and what they learned about microorganisms from doing this experiment. Here are a few examples: 1. Mary grew mold on potato slices in four different temperatures. She carefully recorded her data, took pictures of the growth, and wrote a complete conclusion. 2. Scott grew fungi on bread. He tested the effects of the amount of moisture on the growth of fungi. He explained to the class what he had learned with the help of a graph. 3. Leslie wanted to test different foods to see which one would grow fungi best. She wrote a hypothesis before she started. She carefully monitored her project and recorded the data. She understood and explained to the class which food has worked the best. 4. Candice wanted her project to test whether fungi would grow better in a dark area or in a light area. She wrote a problem, did research, wrote a hypothesis, wrote her procedure, did her experiment, kept data, and wrote a conclusion. 17. Which of the following is a process of the food industry that uses heat to kill harmful bacteria? A) Botulism B) Fission C) Pasteurization D) Vaccination 18. What is the cause of athlete s foot? A) Algae B) Bacteria C) Fungi D) Paramecium Every morning Sara eats an orange. Her mother keeps a bowl of fruit on the kitchen table for the family. Sara has noticed that this summer the oranges have a few spots with white powdery appearances and a bitter taste. She wonders what is happening. 16. Which student conducted the most scientific experiment? A) Mary B) Scott C) Leslie D) Candice 19. Using your knowledge of fungi, which of the following might prevent the mold from growing? A) Buy a different type of orange. B) Keep the oranges in the refrigerator. C) Put the oranges in a damp place. D) Put the oranges in a warm place. 4
20. Which of the following is true of fungi? A) Fungi contain chlorophyll. B) Fungi decompose organic matter. C) Fungi have flagella. D) Fungi make their own food. 23. Which of the following could be classified as a fungus? A) Algae B) Euglena C) Mold D) Tree 21. The science teacher wanted to show students the need for clean hands. She prepared four culture plates of nutrient agar and made certain that the agar was not contaminated. She then touched Plate 1 with her fingers. She rinsed her hands under running water and touched Plate 2. She used liquid soap and running water to wash her hands and then touched Plate 3. Plate 4 was left closed and untouched. 24. Which of the following is most responsible for the decay of dead organisms? A) Mammals B) Microorganisms C) Nitrogen D) Water Where did the science teacher and students probably find the largest number of bacteria? A) Plate 1 B) Plate 2 C) Plate 3 D) Plate 4 25. Why are decomposers helpful to the food chain? A) They provide nutrients for the soil. B) They prey on carnivores. C) They use photosynthesis to make food. D) They are food for carnivores. 22. A lab investigation included examining prepared slides of pond water. Singlecelled organisms with a nucleus and either cilia or flagella were visible. These organisms probably belong to which kingdom? A) Animalia B) Fungi C) Plantae D) Protista 5
26. A microbiologist tested four substances to find out if they would kill certain types of bacteria. The plate was first exposed and then the substances were applied to the plate. One week later, the scientist recorded the results in the diagram below. Directions: Use the chart below to answer the next question. PREVENTING FOOD FROM SPOILING Treatment Temperature (ºC) Time Preserved Freezing -16 to -29 2-3 months Refrigeration 2 to 5 3-5 days Pasteurization 70 to 72 1-2 weeks Sterilization 100 1-2 years 27. According to this information, which treatment can preserve food for more than one year? Which statement best describes the growth of bacteria 2? A) No growth on the plate. B) Growth in only one section of the plate. C) Growth in two sections of the plate. D) Less growth than bacteria 3. A) Freezing B) Refrigeration C) Pasteurization D) Sterilization 6