Biology 11 Mid-Term Exam NAME: __________________ Part I: Multiple Choice. Put the letter of the correct answer in the blank to the left: ____ 1. A few months after a family of wolves is released in a national park, biologists studying the population of flying squirrels in the park record a significant decline in the flying squirrel population. Which statement represents a hypothesis? a) What is causing the decline of the flying squirrel population? b) The wolves may be eating the squirrels. c) Flying squirrel bones are found in the feces of wolves. d) Wolves are observed watching flying squirrels with hungry eyes. e) A paper is found in the biology library listing flying squirrels among several other rodents as a food source for wolves. ____ 2. Structures found in the cells of both plants and animals are a) cell walls and cell membranes b) centrioles and lysosomes c) chloroplast and ribosomes d) cell membranes and chromosomes e) contractile vacuoles and leucoplasts ____ 3. Which structure is common to ALL eukaryotic cells? a) chloroplast b) mitochondrion c) cell wall d) bilayer membrane e) nucleus ____ 4. Which organelle viewed using the electron microscope, appears to be a collection of fine granules and tiny fibres? a) mitochondrion b) ER c) chloroplast d) nucleolus e) Golgi ____ 5. If plant cells are immersed in distilled water, the resulting movement of water into the cells is: a) conduction b) active transport c) transpiration d) osmosis e) facilitated diffusion ____ 6. If a group of living cells swim away from a source of light, they are demonstrating which characteristic of living organisms? a) Living things grow, develop, and reproduce. b) Life is organized c) Living things react to environmental change. d) Life requires energy. e) Living things adapt ____ 7. Which of the following is true about secondary consumers in an ecosystem? a) They eat only plants. b) They are eaten by primary consumers. c) They are smaller and weaker than are primary consumers. d) They are fewer in number than are primary consumers. e) They contain the greatest total biomass in the system. ____ 8. In the nitrogen cycle, the transformation of gaseous nitrogen into nitrogen-containing compounds is performed primarily by a) fungi b) bacteria c) green plants d) herbivores e) carnivores ____ 9. Which of the following organisms is most likely to be located at the top of the pyramid of biomass? a) grass b) grasshopper c) snake d) mouse e) hawk ____ 10. Which is the description of a population? a) all of the different kinds of fish in a pond b) all of the autotrophs in a pond c) all of the pied-billed grebes (a type of bird) in a pond d) all of the organisms interacting with each other in a pond e) all the carnivores in a pond ____ 11. The ability to manufacture food occurs in: a) plants only b) herbivores only c) decomposers only d) plants and herbivores only e) plants, herbivores, and omnivores ____ 12. Biologists conduct experiments and make observations of the natural world in order to help them: a) prove their hypotheses are correct. b) construct a conceptual view of the natural world. c) discover the truth of reality d) disprove theories based on the supernatural. ____ 13. Some people have suggested that planting millions of trees will counteract the human addition of CO2 to the atmosphere. In the long term, this idea could work only if: a) biomass is produced. b) photosynthesis occurs. c) the trees never decompose or burn. d) the trees are planted in the natural forest. e) extra fertilizer is provided to the trees. ____ 14. All of the following are density-dependent factors that limit animal populations EXCEPT a) weather b) predation c) birthrate d) food competition e) mortality ____ 15. The total magnification of a compound microscope with a 5X eyepiece and an objective power of 10X is: a) 15X b) 500X c) 50X d) 25X Part II: Complete each of the following with the proper word or words. 1. Organelle where energy necessary for cell activities is produced. ______________ 2. Boundary that separates a plant cell from its environment. ______________ 3. The storage area of a cell. ______________ 4. Cells that do not have a membrane bound nucleus. ______________ 5. The process by which substances are engulfed and taken into the cell. ______________ 6. An example of an abiotic factor would be ______________ 7. Organism that feeds on dead tissues and waste. ______________ 8. Organism that feeds only on other organisms that produce their own food. ______________ 9. The movement from an area of high concentration to low is called ______________ 10. The site of photosynthesis in a green plant is the organelle called the ______________ 11. Organisms that make their own food. ______________ 12. All the possible feeding relationships that exist within an ecosystem. ______________ 13. Robert Hooke was the inventor of the ______________ 14. Cells which lack a nucleus and other membrane bound organelles. ______________ 15. Organelle responsible for protein production. ______________ Part III: Short Answer. Reply to ANY three of the following in detail. 1. List five characteristics of living organisms and explain how each characteristic applies to you. 2 a) Draw and properly label a concept map to illustrate the carbon cycle. b) Why is the carbon cycle important? c) If the carbon cycle is improperly balanced, what happens? d) How can this outcome be somewhat controlled? 3. With the aid of a properly labelled diagram, describe the importance of the nitrogen cycle. 4. Using proper headings describe an experiment to illustrate scientific method. Be sure to indicate what variables were involved. Indicate how controls were used. Part IV: Compulsory. Reply to each of the following in detail. 1. a) List the three statements of the cell theory. b) Explain the roles played by the various scientists in arriving at this idea. 2. a) How is a population of rabbits density-dependent? b) List and describe four density-dependent factors. c) Which of the above factors is considered to be limiting? 3. a) What is meant by the term concept map? b) Draw and properly label a concept map to illustrate the interactions among organisms at various trophic levels from producer to third order consumer. c) What is another name for the above concept map? 4. The data table below shows the results obtained from an experiment carried out to determine the best temperature for growing bacteria. The culture medium was prepared and then inoculated using the streak method. Samples for streaking were obtained by rubbing Q-tips along the chalk ledge. After inoculation, each petri dish was placed in an incubator that could control the temperature at the required settings. After 72 hours, the bacteria colonies were counted and the results recorded. degrees DATA TABLE: Temperature ( Celsius Number of colonies 5 10 10 22 15 100 20 150 25 200 30 80 a) Using the data provided, draw a graph to show the effects of temperature on the growth of the bacteria, Plot the temperature on the horizontal axis (x axis) and the number of colonies on the vertical axis (v axis). b) Examine your completed graph carefully, what can you conclude? c) Based on the results obtained, do you feel that these bacteria could possibly infect the humanbody? Why or why not? (The normal body temperature for humans is 37 C0) d) Using a dotted line -----, extend the line of your graph to show possible results for the number of colonies at 40 C0.