LET - Biological
Science Reviewer 1
1.
Where do producers obtain their energy?
A. From other producers
B. From the consumers
C. From the decomposers
D. From the sun
2.
Why do you experience not seeing things clearly for
some seconds when you enter suddenly a well-lighted room after coming from a
dark room, you?
A. The pupils are not adapted
to the dark
B. The eyes are adapted
to the light only
C. 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 internal environment?
A. Metabolism
B. Growth and development
C. Homeostasis
D. Thermoregulation
4.
What is the most common cause of cardiovascular
disease?
A. Fatty deposits in the
arteries
B. Inadequate supply of
red blood cells
C. Lack of sodium in the
diet
D. Increased heartbeat
5.
Which is the smallest unit of life that can survive
and reproduce on its own?
A. Cell
B. Organ
C. Tissues
D. Population
6.
Which region of a vertebrate forebrain is considered
with the neutral-endocrine control of visceral activities?
A. Cerebellum
B. Thalamus
C. Hypothalamus
D. Pituitary
7.
Which of the following is the building block
carbohydrate?
A. Amino acid
B. Nucleotide
C. Fatty acid
D. 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 energy
B. They have bigger
physique and need more blood
C. Man waste more blood
cells and need extra
D. They are more prone to
anemia disorders
9.
Which of the following is the building block of
protein?
A. Amino acid
B. Nucleotide
C. Fatty acid
D. Monosaccharide
10. Where does
protein synthesis take place?
A. Ribosomes
B. Lysosomes
C. Endoplasmic reticulum
D. Golgi bodies
11. Why are our
lips “redder” than our palm?
A. There is increased blood
flow in the lips
B. Lips are heavily
keratinized
C. Lip epidermis is thinner
D. Many blood vessels are
located around the lips
12. Which of the
following cannot be found in prokaryotes?
A. Cytoplasm
B. Plasma membrane
C. Membrane-bound nucleus
D. DNA
13. What do we call
mutation that is brought about by the earth natural radioactivity?
A. Continuous
B. Induced
C. Lysosomes
D. Chloroplast
14. Which of the
following organelles produces turbo pressure against cell wall and mainly acts
as water reservoir
A. Plastids
B. Vacuole
C. Lysosomes
D. Chloroplast
15. What is the
branch crobial organisms is used in the creation of genetically modified
organisms?
A. Pseudomonas vulgaris
B. Bacillus thuringensis
C. Agro bacterium
tumafaciens
D. Escherichia coli
16. What is the
branch of zoology that is devoted to the study of fish?
A. Helmintology
B. Ichthyology
C. Chondrichthyes
D. Ornithology
17. The process
involved in the production of mRNA using DNA as template is termed _______?
A. Transcription
B. Replication
C. Gene manipulation
D. Reverse transcription
18. What is the
most abundant inorganic compound in the protoplasm?
A. Fluid
B. Blood
C. Plasma
D. Water
19. Which is the
riches type of tropical rain forest in the Philippines?
A. Molave forest
B. Dipterocarp forest
C. Mangrove forest
D. Pine forest
20. What muscle is
described as involuntary, not striated, and have a single nucleus?
A. Smooth
B. Skeletal
C. Cardiac
D. Connective
21. We feel warmer
just before it rains because __________.
A. Heat is released by the
evaporation of water
B. The clouds prevent
heat from escaping the earth
C. There is an increased
relative humidity
D. Heat is released by the
condensation of water vapor
22. Which of the
following is not considered as a reproductive cell?
A. Gamete
B. Somatic cell
C. Egg cell
D. Sperm cell
23. The cell wall
of plant is made of _______.
A. Lipids
B. Cellulose
C. Protein
D. Cell membrane
24. Which of the
following is the correct sequence of the level of organization from lowest to
highest?
A. Cells-system-organs-tissues
B. System-organs-tissues-cells
C. Cells-tissues-organs-system
D. Tissues-systems-cells-organs
25. At metaphase of
the meiotic division, the chromosomes are attached to the spindle fibers as
________.
A. Double chromatids
B. Non-homologous pairs
C. Single chromatid
strands
D. A tetrad of four chromatid
26. Which of the
following is an example of behavioral adaption?
A. Thick green stems of the cactus
plant
B. Thick fur of the bear
C. Shedding leaves during
summer
D. Presence of cuticle on the
upper surface of the leaves
27. The bipolar
nature of the cell membrane is due to _______.
A. Presence of carries
B. Presence of
C. Phospholipids bilayer
D. Integral proteins
28. Which of the
following is made up of diploid number of cells?
A. Zygote
B. Sperm cell
C. Egg cell
D. Both B and C
29. Which plant has
underground stem modified for reproduction?
A. Ginger
B. Camote
C. Tubers
D. Strawberry
30. Which of the
following structures serve as a passageway of food and air?
A. Epiglottis
B. Trachea
C. Pharynx
D. Larynx
31. Which kind of
relationship is exhibited by algae and fungi in lichen?
A. Commensalism
B. Parasitism
C. Symbiosis
D. Competition
32. What do you
call the finger-like folds on the inner linings of the small intestine?
A. Villi
B. Appendix
C. Rugae
D. Cecum
33. Aside from ADP,
what else is the end production of the dark-reaction phase of ohotosynthesis?
A. Carbon dioxide
B. Surag
C. Carbon
D. Starch
34. What is that
flap-like structure that prevents the food from going the wrong way during
swallowing?
A. Epiglottis
B. Larynx
C. Esophagus
D. Pharynx
35. Which pigment
is dominant in red algae?
A. Phycocyanin
B. Fucoxanthin
C. Chlorophyll
D. Pharynx
36. What is the
membrane that surrounds the lungs?
A. Pleura
B. Meninges
C. Peritoneum
D. Pericardium
37. What is that 3-carbon
sugar formed during the dark reaction phase of the photosynthesis?
A. ADP
B. NADPH
C. ATP
D. PGAL
38. What is the
product of carbohydrate digestion?
A. Fatty acid
B. Glucose
C. Amino acid
D. Nucleic acid
39. What process is
responsible for the upward movement of the water in very tall trees?
A. Osmosis
B. Capillary action
C. Turgor pressure
D. Transpiration
40. What is the
enzyme in the mouth that breaks starch to maltose?
A. Peptidase
B. Ptyalin
C. Pepsin
D. Maltase
41. What do you
call the types of symmetry where the body parts are paired on either side of
the body?
A. Dorsal
B. Bilateral
C. Radial
D. Ventral
42. Which is
considered as the respiratory center of the
brain?
A. Cerebellum
B. Medulla oblongata
C. Cerebrum
D. Thalamus
43. Which stage of
incomplete metamorphism is undergone by
grasshopper?
A. Nymph, pupa, adult
B. Egg, larva, pupa,
adult
C. Egg, nymph, adult
D. Egg, pupa, adult
44. Which of the
following is NOT part of the thoracic
cage?
A. Clavicle
B. Ribs
C. Costal cartilages
D. Sternum
45. Where does the
toxin substance secreted by bees and ants through their sting
originate?
A. Silk glands
B. Intestines
C. Rectal glands
D. Salivary glands
46. What is the
longest bone in the body?
A. Humerus
B. Ferum
C. Tibia-fibula
D. Clavicle
47. Which cause our
bones to turn brittle and easily
break?
A. Turning into muscle tissues
B. Increase in
flexibility
C. Turbidity decrease
D. Removal of collagen
48. How many bones
does an adult human body
has?
A. 201
B. 200
C. 217
D. 206
49. What do you
call automatic responses to an external
stimulus?
A. Reflex
B. Instinct
C. Impulse
D. All of these
50. What structure
provides flexible support and protection to the spinal cord?
A. Skull
B. Ribs
C. Vertebral column
D. Sternum
51. Which hormone
is insufficient in
cretinism?
A. Glucagon
B. Adrenalin
C. Insulin
D. Thyroxine
52. Which of the
following is both endocrine and an exocrine
gland?
A. Gastric glands
B. Thyroid glands
C. Pituitary glands
D. Pancreas
53. What organ is
controlled by the automatic nervous
system?
A. Skeletal
B. Muscles
C. Heart
D. Both A and B
54. What do you
call food in a semi-liquid form, partially digested and mixed with hydrochloric
acid?
A. Gastric secretion
B. Gastric fluid
C. Mucosa
D. Chime
55. Which is
considered the master gland due to its influence on the activity of all the
other
glands?
A. Thyroid
B. Adrenal
C. Pituitary
D. Parathyroid
56. Which part of
the brain is responsible for intelligence, memory and learned behavior?
A. Cerebellum
B. Cerebrum
C. Medulla
D. Thalamus
57. Which of these
materials is not a major component of the plasma
membrane?
A. Phospholipids
B. Glycoprotein
C. Proteins
D. DNA
58. Which form of
RNA delivers information from DNA to be used in making
protein?
A. Messenger RNA
B. Ribosomal RNA
C. Transfer RNA
D. All of the above
59. Which of the
following is not a type of
cell?
A. Bacterium
B. Amoeba
C. Sperm
D. 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
B. High specific heat
C. High heat of
vaporization
D. Versatility as a solvent
61. Which of the
following statements is true of
diffusion?
A. It requires an expenditure
of energy by the cell
B. It is a passive
process
C. It occurs when
molecules move from a region of lower concentration to one of
higher concentration
D. It requires a membrane
62. Which of the
following is FALSE in comparing prophase I of meiosis and prophase of
mitosis?
A. The chromosomes condense in
both
B. Tetrads form in both
C. The nuclear envelope
disassembles in bot
D. A spindle forms in both
63. Which are
small, irregularly-shaped cells without nuclei but are rich in
ATP?
A. Leukocytes
B. Thrombocytes
C. Lymphocytes
D. Erythrocytes
64. What branch of
Biology is involved when one is studying the characteristic structure and
functions of all kinds of
cells?
A. Cytology
B. Morphology
C. Physiology
D. Histology
65. Which part of
seed appears as a scar which marks the entry of the pollen tube during
fertilization?
A. Seed leaf
B. Cotyledon
C. Testa
D. Hilum
66. Which type of
tissue is responsible for the secondary growth in stems and roots of vascular
plants?
A. Meristematic cells
B. Cambium
C. Palisade layer
D. Epidermis
67. Which biome
grows tropical grassland with scattered individual trees and larger
herbivores?
A. Tundra
B. Rain forest
C. Grassland
D. Savanna
68. What do you
call that process in birds wherein they shed off features at least once a
year?
A. Skinning
B. Molting
C. Furrowing
D. Migrating
69. What chemical
controls metamorphosis among insects?
A. Enzymes
B. Estradol
C. Pheromones
D. Ethylene
70. Which of the
following makes up the plant cell
wall?
A. Nucleic acid
B. Cellulose
C. Protein
D. Lipids
71. Which of the
following is not true of fungi?
A. Some are pathogenic
B. Some are
photosynthetic
C. Some are edible
D. Form symbiotic relation with
algae
72. Which of the
following is not true of
plants?
A. Some are pathogenic
B. Some are
photosynthetic
C. Some are edible
D. Form symbiotic relation with
algae
73. Which of the
following is considered
multi-cellular?
A. Embryo
B. Fertilized egg
C. Egg cell
D. Sperm cell
74. What hormone
promotes the growth of the uterine lining for the implantation of the
embryo?
A. Lactogenic hormone
B. Progesterone
C. Testosterone
D. Oxytocen
75. Which of the
following pair of organisms are closely
related?
A. Spider and mosquito
B. Frog and crocodile
C. Man and monkey
D. Ants and aphids
76. What does it
mean if the blood pressure of human is
110/70?
A. The systolic pressure is 70
B. The diastolic pressure
is 70
C. The pulse rate is 110
beats per minute
D. Both B and C
77. Which of the
following happens when man exhale?
A. The residual volume of the
lungs decreases
B. The diaphragm
contracts
C. The volume of the
thoracic cavity decreases
D. The lung contracts
78. Which of the
following regulate breathing?
A. RBC concentration
B. Number of haemoglobin
C. Hormone level in blood
D. CO2 and O2 concentration and
pH level sensors
79. Which of the
following has the lowest velocity of blood
flow
A. Veins
B. Arteries
C. Capillaries
D. Arterioles
80. How many carbon
atoms can each pyruvic acid supply into the Kirb’s cycle?
A. 8
B. 6
C. 4
D. 2
81. How many oxygen
is required each time to a molecule of glucose is completely oxidized through
aerobic respiration?
A. 3
B. 6
C. 12
D. 24
82. Which of the
following will not be accepted by glycolysis for
catabolism?
A. Starch
B. Glycerol
C. Fatty acid
D. Sucrose
83. Which of the
following characteristic is common between echinoderms and
cnidarians?
A. They are both radically
symmetrical
B. They have segmented
bodies
C. Both have stinging
cells
D. 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 exchange
III. Dorsal
hallow nerve cord that develops into the central nervous system
A. II and III
B. I and II
C. I and III
D. I, II and III
85. Which of the
following cannot be associated with
fungi?
A. Absorptive nutrition
B. Decomposers
C. Autotrophs
D. Spore production
86. Which of the
following does not involve mitosis?
A. Development of embryo
B. Growth
C. Production of gametes
D. 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 young
III.
They are warm blooded
A. I and II
B. II and III
C. I and III
D. I, II and III
88. What term
describes an egg develop into a new organism without itself being fertilized be
a
sperm?
A. Regeneration
B. Conjugation
C. Parthenogenesis
D. Fusion
89. Which of the
following is responsible for formation of blood
cell?
A. Cartilage
B. Bone narrow
C. Joints
D. Tendons
90. What is most
likely happen when a species cannot adapt to the changes in the
environment?
A. It will be transform to
another form
B. It will become extinct
C. It will be isolated
D. It will grow old
91. What term is
used to describe the released of matured egg cell from the
ovary?
A. Fertilization
B. Copulation
C. Ovulation
D. Germination
92. Which of the
following blood cells is responsible for blood clotting?
A. Erythrocytes
B. Leukocytes
C. Thrombocytes
D. Neutrophils
93. Where does
ectopic pregnancy
occur?
A. Uterus
B. Ovary
C. Cervix
D. Fallopian tube
94. Why is cell
membrane semi permeability important?
A. It is important in
determining the size of the cell
B. It controls the kind
of substances that enters and leaves the cell
C. 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 snake’s disappearance of legs and development of
giraffe’s long
neck?
A. Theory of use and disuse
B. Theory of natural
selection
C. Theory of chromosomal
change
D. Theory of action and
interaction
96. Which of the
following is an exocrine
gland?
A. Plastids and pigments
B. Asters and centrioles
C. Chloroplasts and
vacuoles
D. Cell wall and cell membrane
97. Which of the
following is an exocrine
gland?
A. Thyroid gland
B. Salivary gland
C. Pituitary gland
D. Adrenal gland
98. Which of the
following is not an accessory organ of digestion?
A. Liver
B. Pancreas
C. Salivary gland
D. Adrenal gland
99. What hormone
stimulates the development of male secondary sex characteristics?
A. Estrogen
B. Prolactin
C. Testosterone
D. Progesteron
100.
Which of the following parts performs both as
reproductive and urinary functions in
males?
A. Ureter
B. Testes
C. Urethra
D. Scrotum
ANSWER KEY
1. D
2. C
3. C
4. A
5. A
6. C
7. D
8. A
9. A
10. A
11. C
12. C
13. C
14. B
15. D
16. B
17. A
18. D
19. B
20. A
21. D
22. B
23. B
24. C
25. A
26. C
27. C
28. A
29. C
30. C
31. C
32. A
33. B
34. A
35. D
36. D
37. D
38. B
39. B
40. B
41. B
42. B
43. C
44. A
45. C
46. B
47. D
48. D
49. A
50. C
51. D
52. D
53. C
54. D
55. C
56. B
57. D
58. A
59. D
60. D
61. B
62. B
63. D
64. A
65. D
66. B
67. D
68. B
69. A
70. B
71. B
72. D
73. A
74. B
75. C
76. B
77. C
78. D
79. A
80. D
81. B
82. C
83. A
84. D
85. C
86. C
87. D
88. C
89. B
90. B
91. C
92. C
93. D
94. B
95. A
96. B
97. B
98. D
99. C
100. C
Resources:
Retrieved May 16, 2020, from http://letreviewer2.blogspot.com/2014/01/practice-test-in-let-biological-science.html
Holy Cross Retrieved May 16,
2020, from https://www.coursehero.com/file/24927886/Biologypdf/
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