practice test in let biology

7/28/2019 Practice Test in LET BIOLOGY

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PRACTICE TEST IN LET BIOLOGY

1. Where do producers obtain their energy?A. From other producersB. From the consumersC. From the decomposersD. From the sun

2. Why do you experience not seeing things clearly for some seconds whenyou enter suddenly a well-lighted room after coming from a dark room,you?

A. The pupils are not adapted to the darkB. The eyes are adapted to the light onlyC. The pupils are not dilated yet

D. Light had caused temporary blindness

3. What term is used to describe the ability to maintain a constant internalenvironment?

A. MetabolismB. Growth and development


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C. HomeostasisD. Thermoregulation

4. What is the most common cause of cardiovascular disease?A. Fatty deposits in the arteriesB. Inadequate supply of red blood cellsC. Lack of sodium in the dietD. Increased heartbeat

5. Which is the smallest unit of life that can survive and reproduce on its own?A. CellB. OrganC. TissuesD. Population

6. Which region of a vertebrate forebrain is considered with the neutral-endocrine control of visceral activities?

A. CerebellumB. Thalamus

C. HypothalamusD. Pituitary

7. Which of the following is the building block carbohydrate?A. Amino acidB. NucleotideC. Fatty acidD. Monosaccharide

8. Why it is necessary men have more red blood cells per cubic millimeter of blood than women?

A. Man does strenuous activities and need more energyB. They have bigger physique and need more bloodC. Man waste more blood cells and need extra


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D. They are more prone to anemia disorders

9. Which of the following is the building block of protein?A. Amino acidB. NucleotideC. Fatty acidD. Monosaccharide

10.Where does protein synthesis take place?A. RibosomesB. LysosomesC. Endoplasmic reticulumD. Golgi bodies

11. Why are our lips redder than our palm? A. There is increased blood flow in the lipsB. Lips are heavily keratinizedC. Lip epidermis is thinnerD. Many blood vessels are located around the lips

12.Which of the following cannot be found in prokaryotes?A. CytoplasmB. Plasma membraneC. Membrane-bound nucleusD. DNA

13.What do we call mutation that is brought about by the earth natural

radioactivity?A. ContinuousB. InducedC. LysosomesD. Chloroplast


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14.Which of the following organelles produces turbo pressure against cell walland mainly acts as water reservoir

A. PlastidsB. VacuoleC. LysosomesD. Chloroplast

15.What is the branch crobial organisms is used in the creation of geneticallymodified organisms?

A. Pseudomonas vulgarisB. Bacillus thuringensisC. Agro bacterium tumafaciensD. Escherichia coli

16.What is the branch of zoology that is devoted to the study of fish?A. HelmintologyB. IchthyologyC. ChondrichthyesD. Ornithology

17.The process involved in the production of mRNA using DNA as template istermed _______?

A. TranscriptionB. ReplicationC. Gene manipulationD. Reverse transcription

18.What is the most abundant inorganic compound in the protoplasm?A. FluidB. BloodC. PlasmaD. Water


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19.Which is the riches type of tropical rain forest in the Philippines?A. Molave forestB. Dipterocarp forestC. Mangrove forestD. Pine forest

20.What muscie is described as involuntary, not striated, and have a singlenucleus?

A. SmoothB. SkeletalC. CardiacD. Connective

21.We feel warmer just before it rains because __________.A. Heat is released by the evaporation of waterB. The clouds prevent heat from escaping the earthC. There is an increased relative humidityD. Heat is released by the condensation of water vapor

22.Which of the following is not considered as a reproductive cell?A. GameteB. Somatic cellC. Egg cellD. Sperm cell

23.The cell wall of plant is made of _______.A. Lipids

B. CelluloseC. ProteinD. Cell membrane

24.Which of the following is the correct sequence of the level of organizationfrom lowest to highest?


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A. Cells-system-organs-tissuesB. System-organs-tissues-cellsC. Cells-tissues-organs-systemD. Tissues-systems-cells-organs

25.At metaphase of the meiotic division, the chromosomes are attached to thespindle fibers as ________.

A. Double chromatidsB. Non-homologous pairsC. Single chromatid strandsD. A tetrad of four chromatids

26.Which of the following is an example of behavioral adaption?A. Thick green stems of the cactus plantB. Thick fur of the bearC. Shedding leaves during summerD. Presence of cuticle on the upper surface of the leaves

27.The bipolar nature of the cell membrane is due to _______.

A. Presence of carriesB. Presence of C. Phospholipids bilayerD. Integral proteins

28.Which of the following is made up of diploid number of cells?A. ZygoteB. Sperm cell

C. Egg cellD. Both B and C

29.Which plant has underground stem modified for reproduction?A. GingerB. Camote


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C. TubersD. Strawberry

30.Which of the following structures serve as a passageway of food and air?A. EpiglottisB. TracheaC. PharynxD. Larynx

31.Which kind of relationship is exhibited by algae and fungi in lichen?A. CommensalismB. ParasitismC. SymbiosisD. Competition

32.What do you call the finger-like folds on the inner linings of the smallintestine?

A. VilliB. Appendix

C. RugaeD. Cecum

33.Aside from ADP, what else is the end production of the dark-reaction phaseof ohotosynthesis?

A. Carbon dioxideB. SuragC. Carbon

D. Starch

34.What is that flap-like structure that prevents the food from going thewrong way during swallowing?

A. EpiglottisB. Larynx


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C. EsophagusD. Pharynx

35.Which pigment is dominant in red algae?A. PhycocyaninB. FucoxanthinC. ChlorophyllD. Pharynx

36.What is the membrane that surrounds the lungs?A. PleuraB. MeningesC. PeritoneumD. Pericardium

37.What is that 3-carbon sugar formed during the dark reaction phase of thephotosynthesis?

A. ADPB. NADPH

C. ATPD. PGAL

38.What is the product of carbohydrate digestion?A. Fatty acidB. GlucoseC. Amino acidD. Nucleic acid

39.What process is responsible for the upward movement of the water in verytall trees?

A. OsmosisB. Capillary actionC. Turgor pressure


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D. Transpiration

40.What is the enzyme in the mouth that breaks starch to maltose?A. PeptidaseB. PtyalinC. PepsinD. Maltase

41.What do you call the types of symmetry where the body parts are paired oneither side of the body?

A. DorsalB. BilateralC. RadialD. Ventral

42.Which is considered as the respiratory center of the brain?A. CerebellumB. Medulla oblongataC. CerebrumD. Thalamus

43.Which stage of incomplete metamorphism is undergone by grasshopper?A. Nymph, pupa, adultB. Egg, larva, pupa, adultC. Egg, nymph, adultD. Egg, pupa, adult

44.Which of the following is NOT part of the thoracic cage?

A. ClavicleB. RibsC. Costal cartilagesD. Sternum


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45.Where does the toxin substance secreted by bees and ants through theirsting originate?

A. Silk glandsB. IntestinesC. Rectal glandsD. Salivary glands

46.What is the longest bone in the body?A. HumerusB. FerumC. Tibia-fibulaD. Clavicle

47.Which cause our bones to turn brittle and easily break?A. Turning into muscle tissuesB. Increase in flexibilityC. Turbidity decreaseD. Removal of collagen

48.How many bones does an adult human body has?A. 201B. 200C. 217D. 206

49.What do you call automatic responses to an external stimulus?A. Reflex

B. InstinctC. ImpulseD. All of these

50.What structure provides flexible support and protection to the spinal cord?A. Skull


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B. RibsC. Vertebral columnD. Sternum

51.Which hormone is insufficient in cretinism?A. GlucagonB. AdrenalinC. InsulinD. Thyroxine

52.Which of the following is both endocrine and an exocrine gland?A. Gastric glandsB. Thyroid glandsC. Pituitary glandsD. Pancreas

53.What organ is controlled by the automatic nervous system?A. SkeletalB. Muscles

C. HeartD. Both A and B

54.What do you call food in a semi-liquid form, partially digested and mixedwith hydrochloric acid?

A. Gastric secretionB. Gastric fluidC. Mucosa

D. Chime

55.Which is considered the master gland due to its influence on the activity of all the other glands?

A. ThyroidB. Adrenal


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C. PituitaryD. Parathyroid

56.Which part of the brain is responsible for intelligence, memory and learnedbehavior?

A. CerebellumB. CerebrumC. MedullaD. Thalamus

57.Which of these materials is not a major component of the plasmamembrane?

A. PhospholipidsB. GlycoproteinC. ProteinsD. DNA

58.Which form of RNA delivers information from DNA to be used in makingprotein?

A. Messenger RNAB. Ribosomal RNAC. Transfer RNAD. All of the above

59.Which of the following is not a type of cell?A. BacteriumB. Amoeba

C. SpermD. Virus

60.Which property of water is probably MOST important for the functioning of organisms at the molecular level?

A. Cohesion and high surface tension


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B. High specific heatC. High heat of vaporizationD. Versatility as a solvent

61.Which of the following statements is true of diffusion?A. It requires an expenditure of energy by the cellB. It is a passive processC. It occurs when molecules move from a region of lower concentration

to one of higher concentrationD. It requires a membrane

62.Which of the following is FALSE in comparing prophase I of meiosis andprophase of mitosis?

A. The chromosomes condense in bothB. Tetrads form in bothC. The nuclear envelope disassembles in bothD. A spindle forms in both

63.Which are small, irregularly-shaped cells without nuclei but are rich in ATP?

A. LeukocytesB. ThrombocytesC. LymphocytesD. Erythrocytes

64.What branch of Biology is involved when one is studying the characteristicstructure and functions of all kinds of cells?

A. Cytology

B. MorphologyC. PhysiologyD. Histology

65.Which part of seed appears as a scar which marks the entry of the pollentube during fertilization?


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A. Seed leaf B. CotyledonC. TestaD. Hilum

66.Which type of tissue is responsible for the secondary growth in stems androots of vascular plants?

A. Meristematic cellsB. CambiumC. Palisade layerD. Epidermis

67.Which biome grows tropical grassland with scattered individual trees andlarger herbivores?

A. TundraB. Rain forestC. GrasslandD. Savanna

68.What do you call that process in birds wherein they shed off features atleast once a year?

A. SkinningB. MoltingC. FurrowingD. Migrating

69.What chemical controls metamorphosis among insects?

A. EnzymesB. EstradolC. PheromonesD. Ethylene

70.Which of the following makes up the plant cell wall?


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A. Nucleic acidB. CelluloseC. ProteinD. Lipids

71.Which of the following is not true of fungi?A. Some are pathogenicB. Some are photosyntheticC. Some are edibleD. Form symbiotic relation with algae

72.Which of the following is not true of plants?A. Some are pathogenicB. Some are photosyntheticC. Some are edibleD. Form symbiotic relation with algae

73. Which of the following is considered multi-cellular?A. Embryo

B. Fertilized eggC. Egg cellD. Sperm cell

74.What hormone promotes the growth of the uterine lining for theimplantation of the embryo?

A. Lactogenic hormoneB. Progesterone

C. TestosteroneD. Oxytocen

75.Which of the following pair of organisms are closely related?A. Spider and mosquitoB. Frog and crocodile


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C. Man and monkeyD. Ants and aphids

76.What does it mean if the blood pressure of human is 110/70?A. The systolic pressure is 70B. The diastolic pressure is 70C. The pulse rate is 110 beats per minuteD. Both B and C

77.Which of the following happens when man exhale?A. The residual volume of the lungs decreasesB. The diaphragm contractsC. The volume of the thoracic cavity decreasesD. The lung contracts

78.Which of the following regulate breathing?A. RBC concentrationB. Number of haemoglobinC. Hormone level in blood

D. CO2 and O2 concentration and pH level sensors

79.Which of the following has the lowest velocity of blood flowA. VeinsB. ArteriesC. CapillariesD. Arterioles

80. How many carbon atoms can each pyruvic acid supply into the Kirbs cycle? A. 8B. 6C. 4D. 2


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81.How many oxygen is required each time to a molecule of glucose iscompletely oxidized through aerobic respiration?

A. 3B. 6C. 12D. 24

82.Which of the following will not be accepted by glycolysis for catabolism?A. StarchB. GlycerolC. Fatty acidD. Sucrose

83.Which of the following characteristic is common between echinoderms andcnidarians?

A. They are both radically symmetricalB. They have segmented bodiesC. Both have stinging cellsD. They have three embryonic tissue layers

84.Which of the following is true of Phylum Chordata?I. Presence of notochord that provides skeletal support

II. Pharyngeal slits that have become modified for gas exchangeIII. Dorsal hallow nerve cord that develops into the central nervous

systemA. II and IIIB. I and II

C. I and IIID. I, II and III

85.Which of the following cannot be associated with fungi?A. Absorptive nutritionB. Decomposers


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C. AutotrophsD. Spore production

86.Which of the following does not involve mitosis?A. Development of embryoB. GrowthC. Production of gametesD. Repairing of damaged tissues

87.Which of the followings is true of mammals?I. They have four chambered heart

II. They produce milk for the youngIII. They are warm blooded

A. I and IIB. II and IIIC. I and IIID. I, II and III

88.What term describes an egg develop into a new organism without itself

being fertilized be a sperm?A. RegenerationB. ConjugationC. ParthenogenesisD. Fusion

89.Which of the following is responsible for formation of blood cell?A. CartilageB. Bone narrow

C. JointsD. Tendons

90.What is most likely happen when a species cannot adapt to the changes inthe environment?

A. It will be transform to another form


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B. It will become extinctC. It will be isolatedD. It will grow old

91.What term is used to describe the released of matured egg cell from theovary?

A. FertilizationB. CopulationC. OvulationD. Germination

92.Which of the following blood cells is responsible for blood clotting?A. ErythrocytesB. LeukocytesC. ThrombocytesD. Neutrophils

93.Where does ectopic pregnancy occur?A. Uterus

B. OvaryC. CervixD. Fallopian tube

94.Why is cell membrane semi permeability important?A. It is important in determining the size of the cellB. It controls the kind of substances that enters and leaves the cellC. It controls the pressure and energy gradient

D. It allows the molecules to diffuse freely in and out of the cell

95. What theory of evolution accounts for snakes disappearance of legs anddevelopment of giraffes long neck?

A. Theory of use and disuseB. Theory of natural selection


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C. Theory of chromosomal changeD. Theory of action and interaction

96.Which of the following is an exocrine gland?A. Plastids and pigmentsB. Asters and centriolesC. Chloroplasts and vacuolesD. Cell wall and cell membrane

97.Which of the following is an exocrine gland?A. Thyroid glandB. Salivary glandC. Pituitary glandD. Adrenal gland

98.Which of the following is not an accessory organ of digestion?A. LiverB. PancreasC. Salivary glandD. Adrenal gland

99.What hormone stimulates the development of male secondary sexcharacteristics?

A. EstrogenB. ProlactinC. TestosteroneD. Progesteron

100. Which of the following parts performs both as reproductive andurinary functions in males?

A. UreterB. TestesC. UrethraD. Scrotum


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ANSWER KEY

1. D

2. C3. C4. A5. A6. C7. D8. A9. A10. A

11. C12. C13. C14. B15. D16. B17. A18. D19. B

20. A21. D22. B23. B24. C25. A26. C27. C28. A

29. C

30. C31. C32. A33. B34. A35. D


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36. D37. D38. B39. B

40. B

41. B42. B43. C44. A45. C46. B47. D48. D49. A50. C51. D52. D53. C54. D55. C56. B57. D58. A59. D60. D61. B62. B63. D64. A65. D66. B67. D68. B69. A70. B71. B72. D73. A


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74. B75. C76. B77. C

78. D

79. A80. D81. B82. C83. A84. D85. C86. C87. D88. C89. B90. B91. C92. C93. D94. B95. A96. B97. B98. D99. C

100. C

BACKGROUN D OF M R. CRI SE NCI O M . PANER: Ph.D. in Biological Science (Candidate), USTM.S. in Microbiology, USTB.S. Biochemistry, USTItalian Government Scholar College Scholar Certificate in Education


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