EXAM

1. Region 1
Division of La Union
SAN GABRIEL VOCATIONAL HIGH SCHOOL
Bumbuneg, San Gabriel, La Union
4th Periodical Exam in Science 8
Name:___________________________________________________________Section:___________________ Score: __________________
I. MULTIPLE CHOICE.Choose the letter of the correctanswer. Write youranswer on the space provided before
each number.
_______1.Thelargest division of kingdom is called_________.
a. class c. order
b. family d. phylum
_______2.Heestablished the binomial system of classification.
a. Aristotle c. Linnaeus
b. Lamarck d. Lyle
_______3.Whichamong the followingareas of taxonomy refers to the giving of names to living organisms?
a. classification c. nomenclature
b. identification d. taxon
_______4.If humans and monkeys belong to the same class, then, they must belong to the same __________.
a. genus c. order
b. family d. phylum
_______5.Allof the followingare the threats of biodiversity EXCEPT:
a. alien species c. overpopulation
b. population explosion d. sanctuaries
_______6.Whichof the followingis an example of in-situ conservationmethod?
a. protected areas c. aquaria
b. zoos d. terrarium
_______7.Whichof the followingis a differencebetween a food chain and a foodweb?
a. Food chains are linear and foodwebs are complex.
b. Food chains include decomposers, but foodwebs do not.
c. Food chains involveonly plants, while foodwebs involveanimals.
d. Food chains involveplants and animals, but food webs involveonly animals.
e. Food chains involveonly plants, whilefood webs involveboth plants and animals.
_______8. ______ areautotrophic organisms withthe ability to carry on photosynthesis and to make food for
themselves.
a. Carnivores c. Herbivores
b. Consumers d. Producers
_______10.Whichof the processes listed below will remove CO2 from the air?
a. denitrification c. nitrification
b. photosynthesis d. respiration
_______11.Oxygenfoundin the atmosphere is mainly produced by which process?
a. Bacterial decay c. Photosynthesis
b. Cellular respiration d. Volcanic eruptions
_______12.Theprocess of photosynthesis is described as
a. carbon dioxide + oxygen + sunlight → glucose + water
b. carbon dioxide + glucose + sunlight → oxygen + water
c. carbon dioxide + water + sunlight → glucose + oxygen
d. glucose + oxygen + sunlight → carbon dioxide + water
_______13.Humans have increased the quantity of carbon dioxide foundin the Earth’s atmosphere and oceans by
a. altering natural ecosystems c. cutting down forests
b. burning fossil fuels d. all of the above
_______14.Nitrogenis removed from the atmosphere by
a. denitrification bacteria c. the photosynthesis process.
b. nitrogen-fixing bacteria d. the respiration process.
_______15.Whichof the followingis most likely a decomposer?
a. bacteria c. grass
b. bird d. water
_______16.Ina food web,arrows point in only one direction. Why is this?
a. The arrows show which organism is bigger
b. The arrows show which species are related

2. c. The arrows show how energy is transferred from one organism to another
d. The arrows show how energy is produced differently within each organism
_______17.Whichof the followingstatements about foodchains is true?
a. A producer uses energy fromother organisms to make its own food.
b. Tertiary consumers hold the most amount of energy in a foodchain.
c. A primary consumer can only obtain energy froma tertiary consumer.
d. An organism can be many different levels of consumers based on whatfood chains they are
included in an ecosystem.
_______18.Theterm “primary consumer” is used to define an organism that
a. eats only plants forenergy b. makes its ownfood forenergy
b. eats only animals for energy d. doesn’t need any food forenergy
_______19.Thecarbon cycleis best responsible for
a. rain b. production of nitrates forplant and animal growth
b. respiration and photosynthesis d. organic material decomposing and returning to the soil
_______20.Thenitrogen cycleis most likely to contain which substances:
a. CO; CO2; Na2CO3 c. H2O vapour; liquid H2O; CO2
b. C6H12O6; CO2; H2O d. N2; NH4; NO3
_______21.Whichof the followingNitrogen fixer is involved in symbiotic association with legumes forming root
nodules?
a. Azotobacter c. Rhizobium
b. Clostridium d. Rhodospirillum
_______22.Watery substance secreted by the salivary gland around the mouth. Helps moisten and soften
foodfor swallowing.
a. benedicts c. vitamins
b. lugols d. saliva
_______23.Apulpy mixture of food and gastric juices. Produced in the stomach, from whichit passes into the small
intestine.
a. amylase c. peristalsis
b. bolus d. chyme
_______24.Regular muscular contractions that move food through the digestive tract.
a. amylase c. peristalsis
b. bolus d. chyme
_______25.Thismuscle helps move food to the back of the mouth forswallowing
a. lips c. teeth
b. saliva glands d. tongue
_______26.Adigestive enzyme that breaks downstarch. It is found in saliva.
a. amylase c. lipase
b. gastric juice d. pepsin
_______27.Theaccessory digestive organs include all of the following, EXCEPT:
a liver c. stomach
b. pancreas d tongue
_______28.Thepancreasis an organ connected to the digestive tract of humans by a duct (tube) through which
digestive enzymes flow.These enzymes are important to the digestive system because they
a. form the acids that break downfood
b. form proteins needed in the stomach
c. change food materials into wastes that can be passed out of the body
d. change foodsubstances into molecules that can pass into the bloodstream and cells
_______29.Inhumans, the large intestine is the major site forthe
a. completion of lipid digestion c. completion of carbohydrate digestion
b. storage of nutrients forfuture use d. absorption of water into the bloodstream
_______30.Whichsubstances are released into the small intestine of a human and aid in the digestion of the
intestinal contents?
a. bile, pancreatic juice, and intestinal juice
b. bile, hydrochloric acid, and salivary amylase
c. salivary amylase, intestinal juice, and pancreatic juice
d. hydrochloric acid, pancreatic juice, and intestinal juice
_______31.Whatis the role of teeth in digestion?
a. They break down foodmechanically, stimulating enzyme synthesis in the food.
b. They break down foodchemically, mixing saliva with the food foreasier digestion.
c. They break downfood chemically,aiding the movement of the foodthrough the esophagus.
d. They break down foodmechanically, increasing the surface area of the food forenzyme action.
________32.Inwhatpartof the body does most chemical digestion take place?
a. large intestine c. pancreas
b. liver d. small intestine

3. _______33.Whatorganproduces bile?
a. large intestine c. pancreas
b. liver d. small intestine
_______34.Thelarge intestine is so-named because it exceeds the small intestine in:
a. amount of smooth muscle c. length
b. diameter d. number of enzymes produced
_______35.Thefoodthat has been chewed and mixed in the mouth withsaliva is called _________.
a. bile c. bulos
b. bolus d. chyme
_______36.Itispart of the large intestine that has no specific function and whichwe couldlive without it.
a. appendicitis c. appendex
b. appendices d. appendix
_______37.Thechromosomes are pulled apart by the spindle fibers during whichstage:
a. Anaphase b. Interphase
c. Telophase d. Prophase
_______38.Thecells of the human body obtain most of their energy from____________.
a. carbohydrates c. minerals
b. fats d. proteins
_______39.Theseare the construction materials for body parts such as muscles, skin, and blood.
a. carbohydrates c. minerals
b. fats d. proteins
_______40.Theseare complex organic molecules that are needed by the body in very small amount.
a. carbohydrates c. minerals
b. fats d. vitamins
_______41.Whichof the followingare not included in the 10 Kumainments?
a. eat salty foods c. use iodized salt
b. eat fruits and vegetables d. have an exercise daily
_______42.Camote,rice and breads are rich in_______________.
a. carbohydrates c. minerals
b. fats d. vitamins
_______43.Duringinterphase:
a. The cellgrows c. The cell prepares for mitosis
b. Chromosomes start to duplicate d. All of the above
_______44.Whatstructureinside the cell helps pull the chromatids apart:
a. Centromere c. Nucleus
b. Spindle Fibers d. Membrane
_______45.Divisionof thecytoplasm during mitosis is called
a. Cytokinesis c. Meiosis
b. Mitosis d. Karyokinesis
_______46.Cytokinesisoccursduring which phase of cell division
a. prophase c. telophase
b. anaphase d. metaphase
_______47.Sister chromatids detach from each other during:
a prophase c. anaphase
b metaphase d. telophase
_______48.Theend result of meiosis is:
a. four cells c. one cell
b. five cells d. two cells
_______49.Thefollowingare the functions of mitosis EXCEPT:
a. growth c. renew
b. repair d. reproduction
_______50.How many daughter cells produced in meiosis?
a. two diploid c. fourdiploid
b. two haploid d. four haploid