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Worksheets10th Grade Biology Ecology Practice
Total questions: 25
Worksheet time: 14mins
In a pond, two species of fish feed on insects and worms. The insects feed on the green plants that live in the water. What constitutes a population in this ecosystem?
All the living organisms
All the animals
All the fish
All the fish of one species
What is the ecological term for a group of different types of organisms that live together and interact with each other?
Community
Domain
Ecosystem
Population
Which type of organism is most likely to be photosynthetic?
Primary consumer
Heterotroph
Autotroph
Secondary Consumer
Food webs consist of:
All the consumers in an ecosystem
All producers in an ecosystem
The combined total of interconnected food chains
The species responsible for recycling the ecosystem’s biomass
The movement of materials from living organisms back to the abiotic environment is dependent on:
Autotroph
Primary Producer
Decomposer
Primary consumer
The first trophic level of a food chain or web is always occupied by a(n):
Decomposer
Animal
Primary consumer
Primary producer
A food web is given. Which labelled organism in the web are both secondary and tertiary consumers?
Carnivorous insects
Spiders
Stoats
Rabbits
In a meadow, crickets eat plants, frogs eat the crickets, and snakes eat the frogs. Which are the primary consumers?
plants
crickets
frogs
snakes
The difference between a food chain and a food web is that
only a chain shows trophic levels
only webs have more than one species of organism
only chains tell the feeding relationships between organisms
only webs show how different chains are connected in an ecosystem
The secondary consumers are the:
Autotrophs
Herbivores
Carnivores
Top Predators
Which are characteristics of a species?
I. The potential to interbreed to produce fertile offspring.
II. The formation of a population with members of the same species within a community.
III. The overproduction of offspring.
I and II
I and III
II and III
I, II and III
Which of the following ecological units includes abiotic factors?
Community
Ecosystem
Population
Trophic level
Which of the following secrete chemicals that break down dead organic material to recycle its biological molecules?
bacteria
fungi
decomposers
all of them
Which list includes three abiotic factors that affect aquatic plants?
number of decomposers, pH of water, day length
water temperature, oxygen concentration, light intensity
carbon dioxide concentration, number of primary consumers, wavelength of light
water temperature, number of secondary consumers, carbon dioxide concentration
The total dry weight of all living organisms in an ecosystem is called its:
Productivity
Biomass
Trophic level
Energy
Why is a diagram of energy flow from trophic level to trophic level shaped like a pyramid?
Organisms at each level store most of the energy and pass little on
There are more producers than primary consumers, and so on
Organisms eventually die as they get older
Most energy at each level is lost, leaving little for the next
In the flow of energy from one trophic level to the next one, high amount of energy is being lost. Which of the followings is not a reason of this energy loss?
Heat
Undigested food particles
Metabolic activities
Photosynthesis
The image shows an Arctic food web.
What is the role of the Arctic hare?
Detritivore
Primary consumer
Secondary consumer
Saprotroph
What will happen to the food web above if the sea otter disappears?
Large fish increase and sea urchins decrease
Abalones increase and sharks increase
Sea urchins increase and kelps decrease
Sea stars decrease and sharks increase
The Australian pitcher plant (Cephalotus follicularis) is a green plant that traps and feeds on flies and other live insects. What is this plant’s mode of nutrition?
Producer and saprotroph
Autotroph and detritivore
Autotroph and heterotroph
Consumer and saprotroph
The diagram represents a pyramid of energy.
What level does the letter X represent?
Light
Primary consumers
Abiotic environment
Producers
What is lost between trophic levels in ecosystems and cannot be recycled?
Heat
Nitrogen
Carbon compounds
Biomass
The diagram shows the food web for an aquatic ecosystem in which letters R–Z represent individual species.
Which organism is a tertiary consumer?
Organism T
Organism W
Organism U
Organism Y
Bacteria are especially important in making ______ available to plants
water
nitrogen
carbon
phosphorus
The figure shows a simplified model of the carbon cycle. Each arrow represents a process which involves a transfer of carbon.
What are processes X, Y and Z?
X: Combustion Y: Respiration Z: Photosynthesis
X: Fossilisation Y: Combustion Z: Respiration
X: Fossilisation Y: Respiration Z: Combustion
X: Combustion Y: Assimilation Z: Photosynthesis
