WorksheetsEcosystem Populations Dynamics
Total questions: 22
Worksheet time: 14mins
Many lichens grow on the bark of trees. The relationship between the lichens and the tree is:
parasite-host
symbiosis
mutualism
commensalism
Which one of the following best defines the term 'food web'?
the variety of food that a top carnivore eats
a combination of different heterotrophs
a long food chain with at least four trophic levels
a diagram that shows all the feeding interactions in an ecosystem
Which of the following statements about radioactive decay is true?
all isotopes decay at the same rate
the rate of radioactive decay increases with time
radioactive decay occurs at a regular measurable rate for each isotope
the rate of decay for most isotopes is unknown
Gas analysis of ice cores in Antarctica has shown which trend over the last 100 years?
Atmospheric concentrations of greenhouse gases have increased
There has been no change in atmospheric concentrations of greenhouse gases
Atmospheric concentrations of greenhouse gases have decreased
Global temperatures have decreased
What type of environment are sclerophyll plants adapted to?
tropical climates with nutrient rich soils
wetlands and estuaries
harsh, dry climates and nutrient-deficient soils
mangrove swamps
Why is it when habitat is fragmented, smaller population sizes lead to extinction?
small populations are unable to breed
individuals will always migrate out of the area
there are too many individuals in one habitat
gene flow is restricted and inbreeding occurs
What is the highest number trophic level in this food web?
4
3
2
5
Students wanted to investigate the distribution patterns of periwinkles and brown algae at various distances from the high tide mark on a rock platform. The best sampling technique would be:
Point Sampling
Transect
Quadrats and Transect
Capture-Recapture
What can ancient Aboriginal rock paintings tell us about past ecosystems in Australia?
the type and abundance of animals that were important at the time of the artwork
reveal species that are no longer found in the area or are extinct
indicate the distriubution of species in Australia
all of the above
Radiometric dating is a technique used to calculate:
the age of fossils
the age of rocks and minerals
the type of species
the closest related ancestor of a species
