Cells! Cells! Cells!
All living things are made of these basic units.
Cells
Plant, animal, or both: cells with a cell membrane.
Both
Grass makes its own food using sunlight. Which role does it have?
Producer
Sunlight: Biotic or Abiotic?
Abiotic
Which organism is the producer?
Grass
This structure contains DNA and controls the cell's activities.
Nucleus
This rigid layer supports plant cells but is absent from animal cells.
Cell wall
A rabbit eats grass. Which role does the rabbit have?
Consumer
Mushroom: A or B?
Which organism is the primary consumer?
Energy, transferred when one organism eats another
This structure controls what enters and leaves the cell.
Cell membrane
These structures use sunlight to help a plant cell make sugar.
Chloroplasts
Fungi break down dead organisms and absorb nutrients. Which role do they have?
Decomposer
A fallen log is no longer alive. Is it abiotic or biotic?
What do the arrows show moving from one organism to another?
Energy being transferred from one organism to another
These organelles release usable energy from food to power the cell.
Mitochondria
This water-storage structure is usually much larger in a mature plant cell than in an animal cell.
Vacuole
A bear eats berries and fish. What type of consumer eats both plants and animals?
Omnivore
Name two abiotic factors in a pond ecosystem.
Any two: water, temperature, sunlight, dissolved oxygen, rocks or minerals
If the frog population suddenly decreases, what might happen to the grasshopper population? Explain.
It may increase because fewer frogs are eating grasshoppers.
A cell makes proteins to help it grow and repair itself. Which tiny structures build these proteins?
Ribosomes
1. Name two structures/organelles that plant and animal cells share
2. Name two organelles found in a typical leaf cell but absent from an animal cell.
Shared: any two of nucleus, membrane, cytoplasm, mitochondria, ribosomes or vacuoles.
Leaf-cell structures: cell wall and chloroplasts.
Explain how decomposers help producers grow.
They break down dead material and return nutrients to the environment that producers can take up.
During a drought, less rain falls and many plants die. Identify the abiotic change and explain one possible effect on a consumer.
Less water is the abiotic change. Plant-eating consumers may have less food and decline or move elsewhere.
A pesticide greatly reduces the grasshopper population. Explain one possible effect on the frogs and one on the hawks.
Frogs may decrease because they have less food; hawks may then decrease or move elsewhere because fewer frogs are available.