Year 11 Module 4: Ecosystem Dynamics Quiz

What is the main focus of Module 4 in Year 11 Biology?

• Ecosystem Dynamics

• Cellular Respiration

• Human Anatomy

• Genetic Inheritance

Answer explanation

Module 4 in Year 11 Biology primarily focuses on Ecosystem Dynamics, exploring interactions within ecosystems, energy flow, and the impact of human activities on these systems.

Which of the following is an abiotic factor?

• Competition

• Symbiosis

• Water availability

• Predation

Answer explanation

Water availability is an abiotic factor, as it is a non-living component of the environment. In contrast, competition, symbiosis, and predation are biotic factors, involving interactions between living organisms.

What technique involves surveying a line through a given area to record which organisms are present?

• Transect mapping

• Capture-mark-recapture

• Quadrat sampling

• Radiometric dating

Answer explanation

Transect mapping involves surveying a straight line through an area to systematically record the organisms present along that line, making it the correct technique for this question.

What caused the extinction of the Thylacine?

• Hunting by farmers

• Introduction of new species

• Natural disasters

• Climate change

Answer explanation

The Thylacine, or Tasmanian tiger, was primarily driven to extinction due to hunting by farmers who viewed it as a threat to livestock. This intense hunting pressure, combined with habitat loss, led to its decline.

What evidence supports the idea of continental drift?

• Aboriginal rock paintings

• Gas analysis

• Ice core samples

• Mid-ocean ridges

Answer explanation

Mid-ocean ridges provide evidence for continental drift as they are formed by tectonic plates moving apart, allowing magma to rise and create new oceanic crust, demonstrating the dynamic nature of Earth's surface.

What can ice cores reveal about past climates?

• Continental drift

• Fossil records

• Atmospheric gas composition

• Species distribution

Answer explanation

Ice cores provide valuable data on past climates by trapping bubbles of ancient air, which reveal the atmospheric gas composition, including greenhouse gases. This helps scientists understand historical climate changes.

Which radioisotope is used in radiometric dating to determine the age of fossils?

• Thorium-232

• Potassium-40

• Carbon-14

• Uranium-238

Answer explanation

Carbon-14 is the primary radioisotope used in radiometric dating for fossils, particularly those up to about 50,000 years old. It decays at a known rate, allowing scientists to estimate the age of organic materials.

What is an example of a sclerophyll plant?

• Eucalyptus

• Pine

• Moss

• Fern

Answer explanation

Eucalyptus is a classic example of a sclerophyll plant, characterized by its hard, leathery leaves that are adapted to withstand dry conditions. In contrast, pine, moss, and fern do not share these specific traits.

What is the purpose of restoration plans in mining areas?

• Restore vegetation and habitats

• Increase mining efficiency

• Expand mining operations

• Reduce mining costs

Answer explanation

Restoration plans in mining areas aim to restore vegetation and habitats that have been disturbed by mining activities. This is crucial for environmental recovery and biodiversity, making it the correct choice.

What is the impact of predation on population dynamics?

• Increases prey population

• Decreases predator population

• Creates a balance between predator and prey populations

• Has no impact on population dynamics

Answer explanation

Predation plays a crucial role in regulating populations. It helps maintain a balance between predator and prey, preventing overpopulation of either group, which can lead to ecosystem instability.