Grade 5 Science: 10 Free Practice Questions

Answer: Being warm-blooded, having fur or hair, and typically producing milk to feed their young
Mammals are generally characterized by being warm-blooded, having fur or hair covering their bodies, and typically producing milk to nourish their young, distinguishing features shared across the vast majority of mammal species. Scales and laying eggs in water describe many fish and some reptiles, feathers and hollow bones describe birds, and being cold-blooded with gill breathing describes fish, none of which represent the defining traits of mammals.

Answer: Using a glass jar to store leftover food instead of buying a new container
Reusing a glass jar for storage extends the life of the item and reduces the need to produce or dispose of new materials, conserving resources.

Answer: Introducing a new species can have unintended and harmful consequences on native species that did not evolve alongside the newcomer
This scenario illustrates that intentionally introducing a new species into an ecosystem, even with good intentions such as pest control, can have unintended and harmful consequences for native species that did not evolve defenses against this new threat, which is a well-documented risk of introducing non-native organisms. In this case, the introduced predator caused unintended harm rather than successfully controlling only the intended pest, native species do not always have effective defenses against unfamiliar predators, as shown by the declining bird population, and ecosystems clearly can be significantly affected by the introduction of new species.

Answer: The entire food web would collapse because all consumers depend directly or indirectly on producers for energy
Producers are the foundation of energy flow in an ecosystem. Without them, there would be no source of stored chemical energy for any consumers, causing the food web to collapse.

Answer: As the water cooled, its ability to hold dissolved salt decreased, causing excess salt to come out of solution and form solid crystals
Generally, the amount of solute, such as salt, that water can hold in solution decreases as the water cools, so as the hot solution cooled overnight, the water could no longer hold all of the dissolved salt, and the excess salt came out of solution and crystallized. No chemical reaction with the container occurred, cooler water actually generally holds less, not more, dissolved salt than warm water, and there is no indication that the water fully evaporated overnight, since a solution and undissolved crystals are described, not merely dry residue.

Answer: Metamorphosis
Metamorphosis is the process by which an organism undergoes significant physical transformation during its life cycle, such as a frog changing from an aquatic, gill-breathing tadpole into a lung-breathing, land-capable adult frog. Hibernation refers to a period of inactivity during cold months, pollination is the transfer of pollen between flowers, and photosynthesis is the process by which plants produce food, none of which describe the frog's body-changing life cycle.

Answer: To deliver oxygen and nutrients to cells throughout the body and remove waste products
The circulatory system, powered by the heart, continuously delivers oxygen and essential nutrients to cells throughout the body while also carrying away waste products such as carbon dioxide, supporting the ongoing functions of every organ and tissue. Digestion is primarily carried out by the digestive system, controlling muscle and bone movement is primarily the role of the nervous and muscular systems, and filtering air occurs within the respiratory system, not the circulatory system.

Answer: Geosphere
The geosphere consists of the solid and semi-solid parts of Earth, including rocks, soil, and landforms such as mountains.

Answer: Energy flows one direction from sun to sunflower to beetle to bird and is lost as heat; matter cycles as decomposers break down dead organisms and return nutrients to the soil for the sunflower to reuse
Energy flows one way from the sun through the food chain and is ultimately lost as heat, while matter is recycled through decomposition, allowing nutrients to be reused by producers. Energy cannot flow back to the sun, and matter does not simply disappear.

Answer: A wedge
A wedge is a simple machine consisting of two inclined planes joined together, used to split or separate materials by concentrating force into a narrow edge, exactly as the axe blade splits the log. A wheel and axle involves rotating a wide component to turn a narrower shaft, a pulley uses a wheel and rope to redirect force, and a lever pivots around a fixed point to lift a load, none of which describe a blade splitting material apart.