NLN - ? PRACTICE TEST SCIENCE
PAX EXAM ALL/227 QUESTIONS
AND ANSWERS (A+)
An organism with chloroplast in its cell is probably a -
√Answer :autotroph
Quiz :autotrophs - √Answer :are organisms that produce
their own food from inorganic substances, plants are
autotrophs
Quiz :heterotrophs - √Answer :obtain their food by
consuming plants or other animals. They are also
referred to as consumers.
Primary consumers may be herbivores
Quiz :herbivores - √Answer :plant eaters
Quiz :omnivores - √Answer :plant and meat eaters
Quiz :Secondary consumers - √Answer :are carnivores,
meat eaters, or omnivores that eat herbivores.
Quiz :Tertiary consumers are carnivores that eat -
√Answer :other carnivores or omnivores.
Quiz :What property of water allows someone to fill a
glass slightly above the rim without the water flowing
over? - √Answer :surface tension
Water molecules are polar. This is due to the fact that
oxygen draws the electrons in the molecule toward
,itself. Thus, there is a negative charge surrounding the
oxygen and a positive charge around the hydrogen. The
unbalanced charges cause the water molecules to
cluster, and this gives the water the properties called
surface tension. Surface tension is the the attraction
between molecules at the surface of a liquid, which
allows a glass to be filled above the rim without the
water flowing over.
Quiz :The gap between the neurons are called -
√Answer :synapses
Quiz :Which group of chemicals are not normally found
in most living things? - √Answer :silicates
Carbohydrates, proteins and nucleic acids (RNA and
DNA) are all very important chemicals in living things.
Silicates examples are in sand and glass
Quiz :The alimentary canal is associated with the -
√Answer :the whole passage along which food passes
through the body from mouth to anus. It includes the
esophagus, stomach, and intestines.
digestive tract
Quiz :The numerous villi in the small intestine serve to -
√Answer :provide greater surface area for absorption
Quiz :As light passes obliquely from air to water, it is
bent. The bending is called - √Answer :refraction
,refraction is the bending of light as it passes obliquely
from one medium to another, in this case from air to
water. The speed of light wave changes changes when
it changes media. When the light wave enters the
second medium at an oblique angle, it changes
direction; the light wave is bent.
Quiz :diffraction - √Answer :refers to the spreading of
light waves as they pass through a narrow opening
Quiz :reflection - √Answer :occurs when light bounces
off an object.
Quiz :dispersion - √Answer :occurs when light is
separated into its spectrum
Quiz :Which of the following organelles is not involved in
protein synthesis? - √Answer :mitochondrion
Quiz :To be absorbed by cells, proteins must be
changed into - √Answer :amino acids
Quiz :A neuron that transmits impulses from the
receptors to the spinal cord is called - √Answer :a
sensory neuron
Quiz :Potential energy can be thought of a function of
height. Since total energy is always conserved, the
kinetic energy is at its maximum when the potential is at
its minimum. - √Answer :or at the bottom of the incline.
, Quiz :Which group of organisms can helps prevent the
accumulation of organic wastes in nature? -
√Answer :mosses is an algae
the correct answer is bacteria = bacteria comprise the
decomposer portion of the food chain. They are
responsible for recycling organic material into inorganic
material that plants can use to undergo photosynthesis.
Quiz :As the eardrum is made to vibrate more rapidly,
the sound is perceived as - √Answer :higher in pitch
high pitch sounds are heard when the receptor cells
closer to the oval window are stimulated, and low-pitch
sounds result from the stimulation of the cells that are
farther down the cochlea. The more rapid the vibration
is, the higher the pitch
Quiz :In a field of pure white asters, a grower noticed a
single blue aster. How could the grower test whether
this change affected the gamete-producing cells of the
plant? - √Answer :self-pollinate the flower, and plant the
resulting seeds.
Self pollination would allow the plant to produce
gametes sperm and eggs that would unite and form
seeds. Observing the color of the plants from these
seeds would allow the planter to determine whether this
change occurred at the level of the gametes.
Quiz :A human egg will develop into a female if it is
fertilized by a sperm containing - √Answer :XX
chromosome
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