Grade 8 Objective 2

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Grade 8Objective 2
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1 A woman running in a marathon requires a
constant supply of oxygen to her muscles. Which
cells carry oxygen to muscle tissue? F Artery
cells G Red blood cells H Nerve cells J
Lung cells
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2 Which of the following diagrams best
shows the relationships between the number of
cells, tissues, and organs? A
C B D
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3 The single-celled organisms shown
above live in water. What is the main function
of the structures identified by the arrows? A
Absorbing water B Removing wastes C
Helping with motion D Getting food
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4 Which diagram best shows the energy
transformation from sunlight to chemical energy
in an organism? A C B D
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5 Which molecule in the equation
represents food energy made by plants? A
Carbon dioxide B Water C Glucose D
Oxygen
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Javelina Facts 6 From
information in the table, javelinas are best
described as A decomposers B
producers C omnivores D carnivores
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7 A grassland community is
pictured above. Grasses are considered A
secondary consumers B primary consumers C
decomposers D producers
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8 Based on the information
from the table, which of the four plants grows
under the greatest range of ideal temperature,
rainfall, and pH conditions? A Peanut B
Macadamia nut C Cashew D Pistachio
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9 For rabbits, having long hair is an advantage
over having short hair in environments with
F high levels of rain G a large number
of competitors H low temperatures J few
predators
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10 During primary ecological succession, the
initial formation of soil helps establish
F grasses G mushrooms H shrubs J
trees
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11 While Mrs. Ludlum is driving on a wet road,
her car begins to skid. She regains control of
the car and pulls off the road. She
feels light-headed, and her feet and hands feel
cold. These sensations are the bodys reaction
to a A rise in humidity B stressful
situation C centrifugal force D decrease in
motion
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12 In order to survive in the Arctic tundra, a
mammal must have the ability to F reduce
heat loss G digest lichens H travel across
snow J obtain water from ice
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13 Which of the following processes helps the
body maintain chemical balance? F Tears
washing away dust from the eyes G Rib bones
protecting internal organs H Hair growing
faster in winter months J Cells using sugar in
the blood
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14 Which of the following shows how the
plant above would grow if the pot were
knocked on its side and left for several
weeks? A C B D
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15 According to this food web,
which insect group is most beneficial to the
Chinese banyan tree? A Parasitic wasps B
Mealybugs C Tussock moths D Leaf miners
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16 In the food web
above, which of the following organisms feeds on
the largest variety of different
producers? A B C D
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17 An increase in which of the following
factors will most likely result in an increase
in the size of a population? A Food B
Predators C Competitors D Temperature
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18 The picture above shows four
varieties of the same species of grass that
grow in a prairie ecosystem. Which variety has
the best chance of surviving a long period of
dry weather? A Variety 1 B Variety 2 C
Variety 3 D Variety 4
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19 Acquired behavior is learned rather than
inherited. Which of these is an acquired
behavior? A A bird flying south in the
fall B A kitten drinking milk C A baby duck
swimming on a pond D A dog leading a blind
person
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20 Which of the following is least affected by
seasonal environmental conditions? F The
pattern in a tigers fur G The dropping of
tree leaves H The sprouting of acorns J The
migration of gray whales
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21 This Punnett square shows the
results of a cross between a tall (Tt) corn
plant and a short (tt) corn plant. According to
this information, what percent of the offspring
were tall? F 0 G 25 H 50 J 75
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Red-eyed--Rr
Brown-eyedrr 22 In Drosophila melanogaster
(fruit flies), red eye color (R) is dominant
over brown eye color (r). If the flies in the
picture were crossed, what percent of their
offspring would be expected to have brown eyes?
Record and bubble in your answer on the answer
document.
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23 Glossy leaves are smooth and
shiny. What percent of offspring from the cross
shown above will have glossy leaves? A 0 B
25 C 50 D 100
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Grade 8 Objective 2 Answer Key
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