WorksheetsIB ESS Topic 2
Total questions: 15
Worksheet time: 15mins
After a forest fire, an ecosystem would start regrowth through -
primary succession
secondary succession
climax community
limiting factors
How does energy enter an ecosystem?
sunlight
soil
animals
Which of the following processes removes carbon from the atmosphere?
Plant Respiration
Auto and factory emissions
Photosynthesis
Animal Respiration
One characteristic feature of the tundra is that only the surface thaws in the summer and refreezes in the winter, leaving a permanently frozen subsoil. This characteristic is known as
Hoarfrost
Glaciation
Permafrost
Crystallization
Which biome covers most of the land mass near Earth's equator?
Desert
Grassland
Tropical rainforest
Temperate forest
__________ primary productivity is the total amount of energy that producers convert to chemical energy in organic molecules per unit of time.
Net
Total
Gross
Secondary
How do lichens contribute to primary succession?
Lichens decompose organic matter from animals and plants
Lichens begin to break down rock to form soil
Lichens are nitrogen fixing bacteria
Lichens convert carbohydrates into fossil fuels.
What is formed during primary succession that doesn't need to be formed during secondary succession?
pioneer species
soil
climax community
lichens
Which catastrophic event will most likely have the effect of returning an ecosystem to primary succession?
A tornado
A volcanic eruption
A flood
A drought
Which of the following best describes primary succession?
Volcano wipes out ecosystem that gradually grows back from ash covered soil
Volcano creates a new island of rock that must break down to form an ecosystem
Forest fire burns down forest that must bounce back over time
Tornado destroys a crop that must slowly grow back over time.
What term could be described as an equilibrium?
pioneer species
primary succession
secondary succession
climax community
What best describes the term succession?
rapid changes that create an ecosystem overnight
gradual changes over time to fully create or restore and ecosystem
forest with the tallest trees
the rate species produce offspring
In the context of IB ESS Topic 2, what is the role of a keystone species in an ecosystem?
A) They are the most abundant species in the ecosystem
B) They have a disproportionately large impact on their environment relative to their abundance
C) They are the primary producers in the ecosystem
D) They are the top predators in the ecosystem
Which of the following is an example of a mutualistic relationship in an ecosystem?
A) A lion hunting a zebra
B) A bee pollinating a flower
C) A parasite infecting a host
D) A bird eating a worm
In an ecosystem, what is the primary function of decomposers?
A) To produce energy through photosynthesis
B) To break down dead organic matter and recycle nutrients
C) To compete with primary consumers for food
D) To provide shelter for small animals
