Republic of the Philippines Department of Education Region VIII Schools Division of Calbayog City Oquendo II District MAG-UBAY NATIONAL HIGH SCHOOL Bgy. Mag-ubay, Calbayog City in Science 8 Living Things and their Environment SY:2022-2023 TEST I. DIRECTION. Read and analyze each sentence carefully. Encircle the letter of the correct answer. Erasure means wrong. 1. A part of digestive system where undigested particles is excreted. a. stomach c. Anus b. Esophagus d. Mouth 2. The function of this part is where the first peristaltic action takes place. a. Mouth c. Esophagus b. Anus d. stomach 3. What is the function of this part shown in the picture? a. food is masticated here so its surface area will increase b. muscular churning takes place here c. this part is where undigested particles are excreted d. undigested particles move in this part 4. What the correct sequence of the chemical digestion of food, absorption and assimilation of nutrients. A. Digested food particles are absorbed through villi and microvilli structures in the small intestine out of diffusion and other cell transport mechanisms. B. Digestion of fats, (emulsification using bile and digestion through lipase), carbohydrates (through amylases from pancreas) and protein (through pancreatic and intestinal enzymes) takes place in the small intestine. C. Liver process food nutrients in blood to become compounds vital for living. Cells then make use of various nutrients processed in the liver. D. Hydrochloric acid and other stomach juices mix with food to break down fats and proteins into smaller molecules. E. Salivary amylase starts to digest carbohydrates breaking it into smaller compounds. a. A, B, C, D, E b. E, D, B, A, C c. A,E,B,D,C d. C,D,B,E, A 5. What is the disease of the digestive system whose symptoms includes Heart burn with burning sensation in the chest and upper abdomen? a. gastro esophageal reflux disease (GERD) b. esophageal cancer c. Celiac Disease d. appendicitis 6. What is the disease of the digestive system having symptoms which includes the abnormal and swift passage of waste material through the large intestine, with consequent discharge of loose feces from the anus? a. celiac disease c. diarrhea b. Crohn disease d. irritable bowel syndrome 7. What disease of the digestive system is characterized by the inflammation of the liver that results from a variety of causes either infectious or non-infectious agents? a. cirrhosis c. hepatitis b. gastritis d. ulcerative colitis 8. Below are the best ways of taking good care of your health; except one, a. Vitamins and minerals deficiency can be avoided if one carefully plans his menu. b. One must take at least 5 glasses of water a day for proper digestion and elimination of wastes. c. One must be mindful to eat food that is rich in fiber to avoid loose bowel movement and other diseases in the digestive system. d. Eating at the right time, the right kind and the right amount of food is the best way of keeping our digestive system healthy. 9. Based on the pictures, identify the digestive disease a person is suffering from. a. Liver Cirrhosis b. Hepatitis c. Colon Cancer d. Appendicities For items 10,11,12. Choose three best practices that keeps digestive system healthy. Choose the answer from the box. Shade the letter ________________ A.10.Stress should be managed to avoid problems like 11.indigestion ________________ and loose bowel movement. ________________ B.12.Proper diet can reduce the risk of having gallstones. C. One good way to avoid cholera is to make sure that the water is safe to use. D. Fatty liver can be avoided by drinking alcohol. E. Drinking softdrinks with an empty stomach can help digest food. For items 13-16. Compare meiosis and mitosis using the template below. Choose your answer from the choices below. Mitosis Meiosis 13. 14. 15. 16. a. Makes gametes b. Makes Body Cells c. 4 non-identical daughter cells d. 2 identical diploid daughter cells 17. In what stage of meiosis does the actual reduction of chromosome number occur? a. Anaphase 1 c. Telophase 1 b. Anaphase 2 d. Telophase 2 18. Meiosis is important for the preservation of species and for _______ . a. Variation c. reproduce b. Growth d. improvement For items 19-20. Read the sentences or ideas below. Fill in the black with the correct word to complete the idea. Meiosis is a specialized type of cell division that 19. __________ reduces the (19)________ (chromosome, chromatin) 20. ___________ number by half, creating four (20)________ (haploid, diploid) cells which are genetically distinct from the parent cell. 21. During gamete formation, the pair of genes separate from each other. This is stated in what Mendelian law? a. co-dominance c. independent assortment b. dominance d. segregation 22. What does the law of dominance says? a. trait is expressed more when present in heterozygous form than in homozygous form. b. Recessive traits are expressed over dominant traits. c. Dominant traits are not expressed not until it is combined with an allele of the same kind. d. Dominant traits are expressed whenever it is present. 23. What is a gene? It is a/an __________. a. trait that is based on a protein b. RNA that codes for a protein c. protein that leads to a trait d. DNA segment that codes for a certain protein/trait 24. What is an allele? It is a __________. a. variant form of a given gene b. segment of a given chromosome c. point that connects two sister chromatids d. locus in a gene For item 25-28. Choose the answer from the box. a. species c. Carl Linnaeus 27. The one who devised the binomial system of naming organisms is ____________ 28. Scientific name have two important parts, the _____________ name and the species name. 29. What domain represents organisms whose cell wall composition is different from the usual and is considered to be ancient? a. archaea c. eukarya b. eubacteria d. protista 30. What kingdom is characterized of organisms whose cell walls have peptidoglycans and carbohydrates? a. archaea c. eukarya b. eubacteria d. protista 31. An endangered species is a type of organism that is threatened to become extinct. a. True b. false 32. Species become endangered for two main reasons: loss of habitat and loss of genetic variation. a. True b. false 33. What form of energy is released to the biosphere when one eat something? a. chemical energy c. light b. heat d. mechanical energy 34. Water cycle cannot take place in the absence of what element? a. human c. sun b. moon d. trees 35. What do you call the conversion of liquid water in plant leaves into water vapor? a. condensation c. precipitation b. evaporation d. transpiration 36. When plants and animals die, they are decomposed and the decomposers perform the process called ___________ releasing the nitrogen back into the air. a. Ammonification c. evaporation b. Denitrification d. condensation For items 37-40. Place a check mark if the given practice minimizes negative impact of humans to the environment and x if it does not. Human Activities / or x 37. Hunting Butandings (Whale Shark) 38. Organic Farming 39. Land conversions 40. Use of Solar Energy Prepared by: b. biodiversity d. genus 25. A group of individuals that interbreed in nature is called ____________. 26. The diversity of animals and plants present in a community is called ____________. MARY JANE B. LAGANG SST I June 22, 2023