Extreme Environments
What is an extreme environment?
An environment where conditions such as temperature, pressure, or moisture are so harsh that most organisms cannot survive.
What is migration?
Movement of animals from one region to another in response to seasonal changes.
What is light pollution?
Excessive or artificial light at night.
What do microorganisms need to grow?
Warmth, moisture, and nutrients.
What basic conditions do plants need to grow?
Sunlight, water, air, nutrients, and suitable soil.
Why are tardigrades famous for surviving extreme conditions?
They enter cryptobiosis, shutting down their metabolism to survive heat, freezing, radiation, and dehydration.
What environmental cues trigger migration or hibernation?
Changing temperature, available food, day length (photoperiod), and seasonal patterns.
Why does light pollution confuse baby sea turtles?
They mistake bright artificial lights for moonlight and crawl away from the ocean.
Why do microbes grow well on household surfaces?
Many surfaces are warm, damp, and touched frequently, giving microbes access to nutrients and moisture.
Why might tap water, salt water, and greywater affect plants differently?
Each contains different minerals and chemicals that can help or harm roots and soil balance.
Describe one adaptation of an animal that lives in extreme heat and one that lives in extreme cold.
Heat: camels store water and tolerate high temperatures.
Cold: polar bears have thick blubber and dense fur for insulation.
Give an example of an Australian migratory species and explain why it migrates.
Bogong moths migrate to cooler alpine areas to avoid summer heat and find suitable resting sites.
How does light pollution affect nocturnal animals like possums or bats?
It disrupts feeding, navigation, hunting, and predator–prey behaviour.
How does temperature influence microbial growth?
Warm environments speed up metabolic reactions; cold environments slow or stop growth.
How do drought conditions affect plant survival?
Roots may dry out, photosynthesis slows, leaves wilt, and the plant may die if water is not available.
Q1) How do physical conditions in deserts make survival difficult?
Q2) How do desert animals overcome these challenges?
Q1) Deserts are extremely hot during the day, very cold at night, and have very little water. These conditions make survival difficult because animals can overheat, dehydrate, or struggle to find food.
Q2) Desert animals survive by using special adaptations:
How does hibernation help animals survive harsh environments?
It slows heart rate, breathing, and metabolism so animals use less energy when food and warmth are scarce.
Explain how light pollution affects bird migration.
Birds use stars and natural light to navigate; artificial lights cause disorientation, collisions with buildings, and wasted energy.
Predict what would happen to bacteria if the pH of their environment changed dramatically.
Many bacteria die or become inactive because extreme pH damages their cell structures and enzymes.
How does firestick farming support long-term plant and ecosystem health?
Cool burns clear dead materials, return nutrients to soil, encourage new growth, prevent extreme wildfires, and support biodiversity.
Explain why studying extremophiles like tardigrades helps scientists learn about life beyond Earth.
Extremophiles show how life can survive in places with extreme radiation, cold, or low oxygen, helping scientists understand where life might exist on Mars, Europa, or other harsh environments.
Choose one migratory animal and explain its full journey, including physical challenges and survival adaptations.
Example: Humpback whales migrate thousands of kilometres from Antarctica to tropical waters for breeding. They use stored fat (blubber) for energy and rely on ocean currents and magnetic fields to navigate.
Propose 3 realistic actions a community could take to reduce light pollution and explain how each improves survival for multiple species.
Examples:
(1) Shielded lights → reduces skyglow and protects birds.
(2) Dimming beach lights → protects turtles.
(3) Motion sensors → reduces unnecessary brightness, helping nocturnal animals.
Describe an experiment that tests how moisture affects microbial growth, including a hypothesis, variables, and expected results.
Hypothesis example: “More moisture increases microbial growth.” Variables: independent = moisture; dependent = amount of mould. Control = same temperature, same food source. Expected: moist samples show more growth.
Evaluate how changing one physical condition—such as soil type or pH—could impact plant growth in a controlled experiment.
Example: Sandy soil drains water too quickly, causing drought stress; clay soil may stay too wet, causing root rot. Data would show slower or faster growth depending on condition.