Worksheets🌈 Weekly Review #16 🌈 2025-2026
Total questions: 20
Worksheet time: 34mins
What is the role of decomposers in an ecosystem?
Decomposers produce energy through photosynthesis.
Decomposers break down dead organic matter, recycling nutrients back into the soil.
Decomposers consume living plants and animals for food.
Decomposers create new organic matter from inorganic substances.
What is the importance of biodiversity in an ecosystem?
Biodiversity only benefits certain species while harming others.
Biodiversity reduces the number of species in an ecosystem, leading to less competition.
Biodiversity has no significant impact on ecosystem health or functionality.
Biodiversity enhances ecosystem productivity, stability, and resilience, allowing ecosystems to adapt to changes.
What is homeostasis?
The process by which living organisms maintain a stable internal environment despite changes in external conditions.
A method of communication between cells in an organism.
The ability of an organism to adapt to its environment over time.
The process of breaking down food into energy.
What is the relationship between photosynthesis and cellular respiration?
Photosynthesis produces glucose and oxygen, while cellular respiration converts them back into carbon dioxide and water.
Photosynthesis and cellular respiration are the same processes occurring in plants.
Photosynthesis occurs only at night, while cellular respiration occurs during the day.
Photosynthesis converts glucose and oxygen into carbon dioxide and water, while cellular respiration uses carbon dioxide and water to produce glucose and oxygen.
What is the function of the mitochondrion in an animal cell?
It helps in cell division.
It synthesizes ATP in the process of aerobic respiration.
It modifies proteins from the rough ER.
It acts as a flexible layer controlling what enters and exits the cell.
What is the role of chloroplasts in a cell?
It helps to support the cell and prevent it from bursting.
It is a large sac used for storage.
It is where the process of photosynthesis takes place.
It helps in the storage of cell sap and keeps the cell turgid.
If there is a community of 17 ocean organisms and 7 of them are Snorks. What is the percentage of Snorks living in this community?
41.18%
50%
35%
60%
How have humans impacted the ocean water?
By increasing pollution
By decreasing water temperature
By increasing biodiversity
No impact
In a community of Orcas, Otters, Urchins, and Kelp which would be the secondary consumer ?
Orcas
Otters
Urchins
Kelp
Living organisms will all try to obtain food that contains the most energy by using the least effort to get that food. This strategy is considered to be the most
competitive
fit
efficient
unlikely
E. coli are bacteria that live in the digestive system of many animals. E. coli use food the animal eats, out-compete other types of bacteria, produce vitamins, and occasionally cause illness. All of these make up the __________ of E. coli.
habitat
environment
phenotype
niche
A photo of all of a human's 46 chromosomes arranged in pairs that includes two X's would be a
normal male karyotpe
normal female karyotype
Down syndrome male
Down syndrome female
Humans have many different hair and eye colors as well as different blood types. Genes come in different versions to express these traits. The alternative forms are known as
loci
chromosomes
phenotypes
alleles
What is the role of enzymes in biochemical reactions?
Enzymes are used to create energy in cells.
Enzymes act as catalysts to speed up chemical reactions without being consumed.
Enzymes are responsible for the transport of molecules across cell membranes.
Enzymes are a type of hormone that regulates metabolic processes.
What are the four main elements found in proteins?
Carbon, Hydrogen, Oxygen, and Nitrogen
Carbon, Hydrogen, Oxygen, and Phosphorus
Carbon, Nitrogen, Oxygen, and Sulfur
Hydrogen, Oxygen, Nitrogen, and Calcium
What is the importance of the nitrogen cycle in ecosystems?
It helps in the formation of ozone layer.
It is crucial for recycling nitrogen in various forms, making it available for living organisms.
It regulates the temperature of the Earth.
It is responsible for the water cycle.
Match the following
rearrange and recombine
mix parts up and put together in new way
constraint
limitation
hydrosphere
all water on Earth
biosphere
where life exists & all living things
geosphere
solid parts of Earth-rocks minerals etc
Biotic or Abiotic factor that restricts the growth of the population
carrying capacity
limiting factor
abiotic factor
biotic factor
Carrying capacity is the ____ population of a species that an environment can support.
average
minimum
maximum
least
