Grade 5 · Science

Answer: B

Producers capture light energy and use it to make sugars. Classification should follow how the organism acquires energy, not simply its size or location. The evidence given specifically supports the producer role.

A: The evidence describes making sugars using sunlight, not obtaining energy by eating organisms.

C: The evidence does not describe breaking down dead material for energy.

D: The question identifies a living organism with an energy-acquisition process.

Answer: C

Decomposers such as many fungi and bacteria break down dead organisms or wastes and obtain energy from that material. The fallen leaf was once part of a producer, linking decomposition to other organisms in the ecosystem.

A: The fungus obtains energy from dead material rather than making sugars with light.

B: A fungus is not an animal, and no predator-prey event is described.

D: The fungus is living and uses material from the leaf.

Answer: A

Follow the arrow from its source to its destination. Grass is the food source and the rabbit receives energy from it. The arrow shows an energy-transfer relationship, not equal identity or a reversed feeding relationship.

B: This reverses the stated direction of energy transfer.

C: Animals do not produce sunlight for plants.

D: They are different kinds of organisms; an arrow does not make them one population.

Answer: A

One pathway reaches the hawk through the rabbit; another reaches it through the grasshopper and frog. These connected chains make a web. The model supports these pathways without supplying every relationship that might occur in nature.

B: No direct grass-to-hawk feeding arrow appears in the supplied web.

C: Grass is the producer; the frog receives energy by eating grasshoppers.

D: The model does not show a frog-to-rabbit relationship.

Answer: A

Fewer rabbits can reduce one food source for hawks. However, the supplied web also includes frogs as food for hawks. This supports a possible effect with uncertainty, not a guaranteed immediate disappearance of every hawk.

B: The model contains another pathway and does not supply timing or population measurements.

C: Hawks are consumers and do not become producers when one food source declines.

D: All organisms continue to require energy for life processes.

Answer: C

A consumer obtains energy from organisms or material it eats. The feeding observation directly supplies that evidence. Body size, movement, and habitat conditions do not by themselves establish an organism's energy-acquisition role.

A: Size does not identify how an organism obtains energy.

B: Amount of visible movement does not determine producer or consumer status.

D: Consumers, producers, and decomposers can all live in sunny areas.

Answer: C

Green plants capture light energy through photosynthesis and store energy in sugars. Soil minerals support plant functions but do not replace sunlight as the major energy input for this food web. Distinguish an energy source from needed materials.

A: Minerals are materials plants need, but they are not the main energy source for photosynthesis.

B: Water is needed for photosynthesis but is not the light energy source.

D: Dead leaves hold previously captured energy; they are not the major initial energy source entering through photosynthesis.

Answer: D

Photosynthesis captures light energy and transforms it into chemical energy stored in sugars made by the plant. The plant can use that energy for life processes or store some in its tissues, where it can become available to consumers.

A: Minerals support plant processes, but captured light supplies energy for photosynthesis.

B: Plants make sugars from carbon dioxide and water using light energy; they do not simply absorb ready-made sugar from air.

C: Energy is transformed, not created from nothing.

Answer: B

Grass captures sunlight and stores energy in plant material. The mouse obtains some of that energy by eating the material. The pathway then continues to the owl through feeding; the mouse does not perform the plant's photosynthesis step.

A: A mouse is a consumer and does not capture energy through photosynthesis.

C: The arrows show energy moving from mouse to owl when the owl feeds, not the reverse.

D: The supplied pathway identifies plant material as its food energy source, not soil.

Answer: D

Living organisms require energy for processes such as repair, transport, and maintaining body functions. These continue while a rabbit rests. Energy need is not limited to visible movement, and resting does not change a consumer into a producer.

A: Visible movement is only one of many life processes that require energy.

B: Maintenance and repair continue to use energy during rest.

C: Growth requires energy even when an animal is resting.

Answer: D

Decomposition helps return materials such as nutrients to the environment. Decomposers also obtain and use energy from dead material, and energy disperses as heat. Recycling materials is not the same as recycling energy back to its sunlight source.

A: Decomposition does not send food energy back to the sun.

B: Decomposers need energy for their own life processes.

C: Minerals do not supply the light energy captured through photosynthesis.

Answer: B

Photosynthesis depends on available light energy. Reduced light can reduce the energy captured and stored by a seedling, affecting growth. This is a reasoned possibility, not proof from one plant pair; stored reserves and other conditions can also affect observations.

A: Reduced light does not guarantee an increase in stored sugar.

C: Equal water does not make light levels equal, and available light affects energy capture.

D: Growth is one of the processes that requires energy in organisms.