ELS 2ND QTR Exam Past Paper PDF

______1. The study of history of life is indeed significant. As part of searching for the fossils of previous organisms, stromatolite played a significant role. What is true about stromatolite? A. It consists of layered bacteria and sediment. B. It is found on eukaryotes. C. It is produc...

______1. The study of history of life is indeed significant. As part of searching for the fossils of previous organisms, stromatolite played a significant role. What is true about stromatolite? A. It consists of layered bacteria and sediment. B. It is found on eukaryotes. C. It is produced by endosymbiosis. D. It is formed during volcanic eruptions. ______2. What is the significance of studying the molecular evidence present among living organisms? A. It will benefit the economy of the world. B. It will give idea for the scientist which to clone. C. It will then serve as the basis of what to study. D. It will allow the classification of living organisms. ______3. Regarding the evolution of multicellular organisms, which of the following claims is untrue? A. The process of continuous specialization brought more complex organisms. B. The prokaryotic organisms that formed multicellular aggregates were like the cells of cyanobacteria. C. They are believed to have evolved from single-celled prokaryotic organisms. D. They are formed from other multicellular colonial aggregates through cells specialization. ______4. Which statement is incorrect about living organisms? A. The earliest forms of life existed were the prokaryotes. B. The eukaryotic organisms evolved from the unicellular prokaryotic. C. Organisms did not change despite of the changes in the environment. D. Evolution of oxygen-producing organisms allowed the increase in the atmospheric oxygen. ______5. Out of the following, which is in the right order? A. eukaryotic cell, photosynthesis, prokaryotic cell, organic molecules B. eukaryotic cell, prokaryotic cell, organic molecules, photosynthesis C. organic molecules, eukaryotic cell, photosynthesis, prokaryotic cell D. organic molecules, prokaryotic cell, photosynthesis, eukaryotic cell ______6. The following statements are challenges for the researchers in finding and identifying signs of early cells. Which is NOT part of the group? A. Cells are microscopic and most have no parts to fossilize. B. Materials and testing laboratories are not available. C. Slightly younger rocks have been heated up and undergone other processes. D. Tectonic plate movements have destroyed nearly all rocks older than about 4 billion years. ______7. Which among the given examples describes the unifying form and structure? A. cellular basis of life C. bats have wings specialized for flying B. light as source of energy D. living things arise from pre- existing cells ______8. All organisms alive today have descended from simple cellular creatures billions of years ago. Biologists were able to identify and preserved some of the characteristics of that earliest organisms. Which theme is this related to? A. Function and structure are interdependent. B. Cell theory as a description of living systems.  C. Emergent properties arise from the organization of life. D. Unity of living systems is explained by evolutionary conservation. ______9. Chameleons shift colors wherever they go. They are able to turn any colors or combine colors depending on where the environment is. What trait is being described? A. adaptation B. interaction C. inheritance D. reproduction ______10. Living organisms cannot live alone. They are interacting with the abiotic factors for sustainability of life. Which among the organisms is considered as abiotic? A. bacteria B. plant C. light D. man ______11. Which unifying theme in life science explains the improvement of lives of all organisms through research? A. adaptation B. inheritance C. energy and life D. biology and society ______12. Life's diversity results from change, which gives rise to the biodiversity we observe today. What unifying theme is this related to? A. evolution B. adaptation C. inheritance D. reproduction ______13..Which asexual reproduction, like that of bacteria, causes one organism to divide into two distinct organisms? A. budding B. binary fission C. fragmentation D. parthenogenesis ______14. Which of the following involves direct reproduction in which each portion regenerates missing parts to become a complete new animal depending on the axis of separation? A. budding B. fragmentation C. parthenogenesis D. transverse fission ______15. Which kind of animal reproduction creates a new live organism by fusing two gametes from distinct species? A. sexual B. asexual C. both A & B D. none of the above ______16. Which of the following best describes the process of asexual reproduction whereby unfertilized eggs develop into female offspring? A. budding B. fragmentation C. parthenogenesis D. transverse fission ______17. Which of the following refers to the collective term for sperm and egg cells? A. gametes B. body cells C. tissues D. both A & B ______18. Which of the following statements regarding animals' asexual reproduction is TRUE? A. utilize gametes of the body B. variety of genetic make – up is produced C. involves more amount of time in the process D. produce offspring which are identical with the parents For numbers 19 and 20, refers to the following choices below. A. Statement I is correct C. Statement I and II are both correct B. Statement II is correct D. Statement I and II are both incorrect ______19. I – Since ancient times, the practice of genetic engineering had begun. - A II – Artificial selection is done to directly manipulate genes focusing on the physical traits among organisms. ______20. I – Enzymes help in recombinant DNA technology by carrying and integrating the desired traits among organisms. II – Host organisms are used to propagate the recombinant DNA. B ______21. Which of the following is NOT belong to the ancient practices of genetic engineering?  A. hybridization C. recombinant DNA technology B. Inbreeding D. selective breeding ______22. Which of the following is the process of manipulating genes to alter an organism’s genetic make-up? A. artificial selection C. genetic engineering B. cloning D. gene splicing ______23. Which of the following techniques involves removing DNA from one organism and reintroducing it into another? A. selective breeding C. gene splicing B. gel electrophoresis D. hybridization ______24. Which technique is used to create an organism that is a genetic duplicate of the other? A. cloning B. hybridization C. inbreeding D. gene splicing ______25. Which among the following is the other term for genetically modified organism? A. artificially selected organism C. cloned organism B. transgenic organism D. selected organism For numbers 26-27, refer to the following choices. A. Statement I is correct. - #27 C. Statements I and II are correct. - #26 B. Statement II is correct. D. Statements I and II are incorrect. ______26. I. Genetically modified plants have created resistance to harmful agents, enhanced product yield, and shown increased adaptability for better survival. II. Recombinant DNA technology has applications in various areas like medicine, focusing on the discoveries of medicine to cure and improve human health and nutrition. ______27. I. Genetically modified organisms (GMO) are products of recombinant DNA technology. II. Translated organism is another term for genetically modified organism. ______28. Which is referred to as the ethical implications and applications of the process of genetic engineering? A. Bioethics B. Biosynthesis C. Biogenesis D. Biogenetics ______29. Which among the following techniques below is used for improving human health condition by producing vaccines and pharmaceuticals? A. cloning C. recombinant DNA technology B. gene splicing D. selective breeding ______30. What plant is used to produce virus proteins against hepatitis B? A. alfalfa B. corn C. soy beans D. tobacco ______31. Which system delivers oxygen and nutrients to every cell in the body? A. circulatory B. respiratory C. muscular D. skeletal ______32. Which body system is responsible for taking in oxygen and getting rid of carbon dioxide? A. digestive system C. excretory system B. circulatory system D. respiratory system ______33. Which system of the body uses veins, blood and arteries? A. circulatory system C. digestive system  B. muscular system D. respiratory system ______34. Which system includes brain, spinal cord and neurons? A. respiratory system C. nervous system B. circulatory system D. digestive system ______35. What body parts are made of tissues that can contract and then relax back to normal size? A. bones B. cartilage C. muscles D. tendons ______36. Which of the following are proteins that fight off diseases? A. B-cells B. memory cells C. antibodies D. Both A & B ______37. Which of the following is an example of the endocrine system directly interacting with the nervous system? A. The vertebrae protect the spinal cord from injury. B. Hormones provide feedback that affects neutral processing. C. Sensory receptors in bones send signals about body position to the brain. D. The brain sends signals that control the speed at which food moves through the intestines. ______38. Kidneys are part of the excretory system. They purify the impure blood and send it back to the rest of the body. Which system is mainly responsible for the transport of plasma to the kidneys? A. circulatory B. respiratory C. nervous D. muscular ______39. What two body systems are most useful in getting nutrients from the food that you eat? A. muscular and endocrine system C. nervous and circulatory system B. nervous and digestive system D. circulatory and digestive system ______40. What two systems work together to provide cells with a constant supply of oxygen while removing carbon dioxide waste? A. circulatory and respiratory C. nervous and circulatory B. muscular and circulatory D. nervous and immune system ______41. The human digestive system is approximately 900 cm long. Food is moved through the digestive tract primarily by which of the following part? A. muscular contractions C. the enzyme amylase and pepsin B. bile produces by the pancreas D. hydrochloric acid by the stomach ______42. How do circulatory system and immune system work together to respond to an injury? A. Increased blood flow carries white blood cells to the site of the injury. B. Increased blood flow kills healthy cells which prevents infection at the site of injury. C. Increased blood flow allows for an increase in the exchange of carbon dioxide and oxygen at the site of the injury. D. Increased blood flow removes infected cells from the body at the site of the injury. ______43. Which of the following refers to a change over time? A. evolution B. gradualism C. migration D. mutation ______44. Which of the following explains the difference in survival of individuals and how they reproduce in a particular environment? A. evolution B. gene flow C. gradualism D. natural selection ______45. Which of the following takes place when population decreases due to various environmental factors such as fires, earthquakes and floods? A. bottleneck effect C. genetic flow  B. founder effect D. natural selection ______46. Which of the following process refers to the movement of genes from one population to another? A. evolution B. gene flow C. gradualism D. natural selection ______47. Which of the following is considered as mechanisms of change? A. genetic drift B. migration C. natural selection D. a, b and c ______48. Who is the Father of Evolution? A. Alfred Russel Wallace C. Charles Darwin B. Carolus Linnaeus D. Jean Baptiste de Lamarck ______49. Which of the following lineages evolved early from the root and remain unbranched? A. basal taxon B. branch point C. root D. sister taxa ______50. Which of the following indicates that an ancestral lineage gave rise to all organisms on the tree? A. basal taxon B. branch point C. root D. sister taxa