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Life processes are the way that we decide if something is living or non-living. All living organisms must carry out all of the processes, but they way they have adapted to do so is different across species.
These processes can be easily remembered with the pneumonic MRS C GREN.
Life processes are the way that we decide if something is living or non-living. All living organisms must carry out all of the processes, but they way they have adapted to do so is different across species.
These processes can be easily remembered with the pneumonic MRS C GREN.
Movement
Movement
Living things can move. Even living things that seem to stay in one place (like plants) can turn to face the Sun or open and close their flowers.
Respiration
Respiration
Respiration is a process that allows living things to convert food into the energy at a cellular level they need to carry out all other life processes.
There are two general ways that this can be done: aerobic (using oxygen) or anaerobic (without oxygen).
Aerobic Respiration:
C6H12O6 + O2 → H2O + CO2 + (36)ATPsugar + oxygen → water + carbon + energydioxide
Anaerobic Respiration:
C6H12O6 → C3H6O3 + (2)ATP sugar → lactic acid + energySensitivity
Sensitivity
Living things can respond to changes in the environment they live in. Some living things are very sensitive. In ecology, these are called indicator species. This means they can tell scientists whether the environment they live in is a healthy one.
Circulation/Control
Circulation/Control
All living things can move energy or resources around within their ‘bodies’ (circulation), and this movement is kept under close control in response to changes in the environment and inside the living thing. This control process is called homeostasis.
Reproduction
Reproduction
Living things can reproduce to make a new, separate lifeform. Different forms of reproduction range from splitting in two (single cells), to making seeds (plants), laying eggs (birds, fish and lizards) or having live young (humans and many other animals).
Growth
Growth
All living things grow. Even very small living things made of a single cell grow bigger, especially for the next requirement.
Excretion
Excretion
Excretion means that living things can get rid of waste that is produced from converting energy. Every time you breathe out, you are excreting waste from your body!
Nutrition
Nutrition
All living things need to consume some kind of food to power their energy conversion (respiration). Humans need to eat food made from other living things, but plants can absorb nutrition from their environment.
Nutrition
ESA Level 2 Biology Study Guide - Chapter 19: NutritionNutrition
Nutrition.pdfCirculation - Internal Transport
ESA Level 2 Biology Study Guide - Chapter 20: Internal Transport in Animals Circulation - Internal Transport
Internal Transport.pdfGas Exchange
ESA Level 2 Biology Study Guide - Chapter 21: Gas Exchange Gas Exchange
Gas Exchange.pdf
The Curious Case of the Takahē
The Curious Case of the Takahē
A Life Processes in Takahē
A Life Processes in Takahē
Nutrition: Takahē diet is mostly grasses and tussocks. Their beaks are adapted to strip seeds and shoots without damaging the plant and their digestive system is adapted to having two different ways to obtain nutrients from their food!
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