WorksheetsRC Science
Total questions: 25
Worksheet time: 25mins
Which of these most likely explains why the bacterial population stopped growing?
The bacteria competed for nutrients and died after all the nutrients were consumed.
The bacteria did not reproduce in the system, and eventually each individual died at the end of its life cycle.
The bacteria mutated from photosynthetic to carnivorous organisms and consumed one another until all the individuals were dead.
The bacteria became diseased and were unable to survive in the closed system.
Four students were asked to create a graph representing a typical predator–prey relationship. Which graph shows a situation in which the number of predators in a population depends on the number of prey?
After researching the diets of several birds inhabiting a nearby pond, a student goes on a field investigation to observe the feeding habits of the birds. The student records information from research and observations in the table. The student observes a great blue heron catching fish near the edge of the pond. Based on the information the student collected, which bird will compete with the great blue heron for the same hunting spots and similar prey?
The mallard, because it hunts for fish while wading near the edge of the pond
The pied-billed grebe, because it dives in open water to get crayfish on the bottom of the pond
The great egret, because it hunts in water near the edge of the pond for fish and other prey
None of these
A group of scientists studied some trees in a pine forest. In the densely forested areas, the trees were within 1m of each other. The scientists observed that these trees had dead branches near the ground. They measured the height above the ground at which the first living branches were found on different-sized trees in the forest. Then they repeated this procedure on the same kind of trees in an open meadow. This graph summarizes the scientists’ data.
Which inference is best supported by these data?
Pine trees in a dense forest can grow taller than pine trees in an open meadow.
Pine trees in a dense forest compete for sunlight with the surrounding trees.
Pine trees in a dense forest are part of a less-complex food web than pine trees in an open meadow.
Pine trees in a dense forest have more living branches than pine trees in an open meadow.
Design a project to compare the effects of physical changes (such as temperature and pressure) on different states of matter.
Heat and cool water, ice, and steam to observe changes in state and record temperatures at which these changes occur.
Freeze and melt different metals to see which one has the highest melting point.
Apply pressure to various solids to determine their hardness.
Observe the color changes in substances when heated without measuring temperature.
What is not a property of all matter?
Mass
Volume
Color
Density
What is the boiling point of water?
100 degrees Celsius
50 degrees Celsius
0 degrees Celsius
200 degrees Celsius
Which of the following is not a characteristic of gas?
Has a definite volume
Fills the shape of its container
Can be compressed
Expands to fill its container
The strangler fig is a vine that starts out as a seed in the tree canopy of the rain forest. It drops its roots down from the canopy to the forest floor.
By sprouting in the rain-forest canopy, the strangler fig seedling is exposed to more —
sunlight
soil
nutrients
consumer
Black walnut trees produce a nontoxic chemical that becomes highly toxic when it is exposed to air or soil. How does this chemical help black walnut trees compete with plants growing nearby?
By attracting herbivores to the other plants
By suppressing the growth of the other plants
By increasing the photosynthesis rates in the other plants
By limiting the amount of water available to the other plants
Which of these cases provides embryological evidence that two species share a common ancestor?
two species with very similar DNA
two species with different body structures
two species with different structures that have similar functions
two different species with similar patterns of early development
Two species might have similar skeletal structures that have different functions. What do these types of structures suggest about the relationship between the two species?
Common structures with different functions suggest that the species live in the same habitat.
Common structures with different functions suggest that the species do not share a common ancestor.
Common structures with different functions suggest that one of the species never learned how to use the structure properly.
Common structures with different functions suggest that the species share a common ancestor that also had a similar structure.
Which of these is least likely to be used to infer evolutionary relationships?
similarities in habitats
similarities among embryos of organisms
similarities at the genetic and molecular level
similarities between living and fossilized organisms
The diagram shows a model of the proposed relationships between some groups of ancient and modern mammals.
How long ago did whales and pigs have a common ancestor?
about 15 million years
about 45 million years
about 55 million years
about 65 million years
Snakes have traces of leglike structures that are not used for movement. Which inference is supported by this fact?
Snakes do not have ancestors.
Snakes are an example of transitional fossils.
Snakes share a common ancestor with animals that have legs.
Snakes and animals that have legs are part of the same species.
Tara is comparing the embryos of parrotfish and salamanders. Although the adult organisms look very different, the embryos follow similar developmental pathways. What does this suggest?
that parrotfish and salamanders are found in the fossil record
that parrotfish and salamanders have the same genetic makeup
that parrotfish and salamanders likely share a common ancestor
that parrotfish and salamanders use their organs for different functions
Based on the information in the table, which conclusion about the relatedness of these organisms is the most reasonable?
The organisms share a common ancestor
The organisms all belong to a different genus
The organisms lack any shared genetic material
The organisms all belong to the domain Archaea.
Which of the following best summarizes photosynthesis?
A chemical reaction involving nitrogen and other atmospheric gases
An adaptation of plants that allows them to add nutrients to the soil
A process by which plants produce sugar using the energy of sunlight
An exchange of gases between animals and the air or water of their habitat
The energy that animals need for their life functions is released when their cells carry out which of the following functions?
Breaking down carbon-based molecules
Absorbing water from the environment
Moving molecules across membranes
Eliminating waste products
Jackson takes long, deep breaths while running for exercise. Which gas does Jackson require from the air?
nitrogen
oxygen
carbon dioxide
hydrogen
What is the primary function of the chlorophyll in plants?
To absorb sunlight for photosynthesis
To provide structural support to the plant
To transport water throughout the plant
To protect the plant from herbivores
Which of the following best describes the process of osmosis?
The movement of water molecules across a semipermeable membrane from a region of lower solute concentration to a region of higher solute concentration
The movement of solute molecules from a region of higher concentration to a region of lower concentration
The active transport of ions across a cell membrane
The diffusion of gases in the atmosphere
In an experiment, a student measures the pH of a solution and finds it to be 3. What does this indicate about the solution?
The solution is acidic
The solution is neutral
The solution is basic
The solution is a buffer
Which of the following is a characteristic of a chemical change?
Formation of a new substance
Change in state from solid to liquid
Change in size or shape
Reversible process
What is the role of enzymes in biological reactions?
To speed up chemical reactions by lowering the activation energy
To slow down chemical reactions by increasing the activation energy
To provide energy for chemical reactions
To act as a reactant in chemical reactions
