Science Flashcards
Energy is transferred between individuals through a food web. In such a web, the producer organisms would be most likely to A. contain chlorophyll B. produce hemoglobin C. be decomposers D. be consumed by predators.
A. contain chlorophyll-This question addresses the organisms in a food web with respect to their role in energy transformations and the chemical requirements to fulfill this role. Producer organisms are capable of using light energy from the Sun to make sugars through the process of photosynthesis. Most photosynthetic organisms use chlorophyll to absorb the necessary photons of light.
Which of the following is an example of a chemical change?
A. Glass shattering
B. Wood burning
C. Water boiling
D. Salt crystals mixing with sugar crystals.
B. Wood burning is the only process listed that involves a change in the composition of the substance. The resulting ashes, smoke, and gases that are produced when the wood burns have a different composition than the wood. Glass shattering, water boiling, and salt crystals mixing with sugar crystals are all examples of physical changes.
Which of the following typically forms from the freezing of rain droplets as they pass through a below-freezing layer of air near Earth's surface. A. Hail B. Sleet C. Snow D. Freezing Rain
B. Sleet—— Hail forms when particles move up and down in cumulonimbus cloud because of strong updrafts, and layers of ice form on the particles. Snow results from the growth and aggregation of ice crystals. Freezing rain is rain that freezes upon contact with cold surfaces. This contrasts with sleet which forms as rain droplets pass through a layer of below freezing air and freeze the droplets.
A student has recorded the height of a single plant every day over the course of a year. which of the following graphs is the most appropriate way to present the student's data? A. Bar Graph B. Pie Chart C. Line Graph D. Multiple-line graph
C. Line Graph
This question asks for the identification of an appropriate graphic presentation of data. A line graph is most appropriate when tracking the trend of a single object. A bar graph is commonly used for illustrating values for categories of discontinuous data. A pie chart (circle graph) is appropriate when the relative proportions or percentages of several subgroups are compared for a single larger category. A multiple line graph is used for representing trends of several items.
Which of the following is the most likely explanation for the bright coloration of many species of coral reef fish?
A. The colors appear dark under water and provide camouflage.
B. The colors help members of each species communicate with each other.
C. Te colors absorb the energy of many wavelengths of light for metabolism.
D. The colors indicate the age of the fish to other fish of the same species.
A. Camouflage
Most of these color patterns look like dark shadows under water and so provide camo. Energy for metabolism in fish is not provided by light but rather by ingested food.
If a 6 inch bar magnet is cut crosswise into three equal pieces, what is the total number of magnetic poles among the three pieces? A. Two B. Three C. Four D. Six
D-when a magnet is split it still always has a north and south pole no matter how many times it is broken.
Earth's 24 hour solar day is caused by A. Earth's revolution around the sun. B. The moon's revolution around the Earth C. Earth's rotation on its axis D. The Moon's rotation on its axis.
C-Earth rotates on its axis creating day and night cycle of 24 hrs.
Which of the following practices is most likely to cause extensive soil erosion?
A. Rotating the crops grown on a parcel of land.
B. Using native vegetation instead of a seawall along seashore property
C. Making hiking trails through the forest out of sturdy porous materials
D. Clearing land of its native trees, shrubs, and grasses.
D. Clearing land of native plants with roots that hold soil in place will cause erosion from wind and rain.
Which of the following responses to a stimulus is a reflex response that does not require activity of cells in the brain?
A. A person about to cross a street looks both ways upon hearing a car.
B. A teenager turns a page after reading the final word on each page of a textbook.
C. A child spits out a new type of food he or she finds distasteful
D. A person pulls a hand away after touching the bottom of a hot iron.
D. A reflex such as pulling away from a hot object involves only two neurons, a sensory neuron from the hand to the spinal cord and a motor neuron from the spinal cord back to the hand. All other choices are for processes that require thought and involement of cells in various centers of the brain, especially the cerebrum.
