NEW
Font size
WorksheetsBiology Unit Revision Quiz
Total questions: 26
Worksheet time: 13mins
What is the primary purpose of classification in biology?
To increase species numbers
To organize and understand the diversity of life
To make identification harder
To eliminate extinct species
A dichotomous key is used to:
Identify and classify organisms
Determine the age of fossils
Measure population growth
Track seasonal migration
Which characteristic is shared by all living organisms?
They all have chloroplasts
They are all multicellular
They all have cells
They all perform photosynthesis
What is the function of ribosomes in a cell?
Store genetic material
Produce proteins
Generate energy
Digest nutrients
Which organelle is responsible for producing energy in a cell?
Ribosomes
Mitochondria
Nucleus
Lysosomes
What structure do plant cells have that animal cells do not?
Cell membrane
Nucleus
Cell wall
Mitochondria
What is the most specific level of classification in taxonomy?
Phylum
Genus
Species
Kingdom
What happens when an ecosystem loses a top predator?
The population of prey species increases
The food web remains stable
Producers disappear
The ecosystem becomes more diverse
Energy flow in an ecosystem follows the order of:
Producers → Consumers → Decomposers
Consumers → Decomposers → Producers
Decomposers → Consumers → Producers
Consumers → Producers → Decomposers
A food pyramid shows:
How nutrients cycle through an ecosystem
The energy transfer between trophic levels
The classification of species
The movement of individual organisms
How does climate change affect ecosystems?
It alters temperature and precipitation patterns
It increases biodiversity
It reduces the need for food chains
It eliminates abiotic factors
Which factor is a biotic component of an ecosystem?
Soil composition
Temperature
A new predator
Water availability
Which process is vital for producers in an ecosystem?
Cellular respiration
Photosynthesis
Decomposition
Predation
What effect does habitat loss have on biodiversity?
It increases biodiversity
It leads to species extinction
It stabilizes ecosystems
It creates more food sources
Seasonal migration occurs when:
Animals change their diet seasonally
Organisms move to a different habitat due to changing conditions
Organisms permanently move to new areas
Animals hibernate
Which factor could cause a decline in population size?
Increased food availability
More predators
Favorable climate conditions
Less competition
Which of the following is an abiotic factor in an ecosystem?
Bacteria
Water
Predators
Plants
What happens when decomposers break down dead organisms?
Energy is lost to the environment
Nutrients are recycled into the soil
New producers are created
The food web stops functioning
Which ecosystem disturbance is caused by humans?
Seasonal temperature changes
A forest fire due to lightning
Deforestation for agriculture
A volcanic eruption
Explain the difference between a dichotomous key and a food web. Give an example of each.
A dichotomous key is used to identify organisms, while a food web shows feeding relationships; example: key for plant species, food web of a pond.
A dichotomous key shows energy flow, while a food web identifies species; example: food web of a forest, key for animal tracks.
Both are used to classify animals; example: key for mammals, food web for birds.
Both show predator-prey relationships; example: key for insects, food web for fish.
Explain the importance of mitochondria in cells and why they are often called the "powerhouse of the cell."
Mitochondria produce energy for the cell, which is why they are called the "powerhouse."
Mitochondria store genetic information for the cell.
Mitochondria help the cell divide during mitosis.
Mitochondria are responsible for photosynthesis in plant cells.
How does habitat destruction impact ecosystems? Provide a real-world example.
It can lead to loss of species and disrupt food chains, such as deforestation causing loss of animal habitats.
It increases biodiversity in the area.
It improves soil fertility and plant growth.
It has no effect on the ecosystem.
Discuss how climate change might affect a specific ecosystem. Include two possible effects.
Climate change can cause temperature rise and altered rainfall, affecting species survival and plant growth.
Climate change only affects the weather, not ecosystems.
Climate change increases the number of species in an ecosystem.
Climate change makes ecosystems more stable.
How do biotic and abiotic factors interact in an ecosystem? Provide an example.
Biotic factors like plants depend on abiotic factors like sunlight and water to grow.
Biotic factors only interact with other biotic factors.
Abiotic factors have no effect on living things.
Biotic and abiotic factors are unrelated in ecosystems.
What happens to an ecosystem if a keystone species is removed? Provide an example.
The ecosystem remains unchanged and stable.
The ecosystem may collapse or change drastically, as keystone species have a large impact on the structure of the community. For example, removing sea otters can lead to an overpopulation of sea urchins, which destroys kelp forests.
Only the keystone species is affected, while other species thrive.
The ecosystem becomes more diverse and balanced.
Describe the role of decomposers in an ecosystem and explain why they are essential to nutrient cycling.
Decomposers produce energy from sunlight and are not involved in nutrient cycling.
Decomposers break down dead organisms and waste, returning nutrients to the soil, which is essential for nutrient cycling.
Decomposers only eat living plants and animals.
Decomposers prevent nutrient cycling by locking nutrients in dead matter.
