Key Stage 2
Meaning
MRS GREN is a memory tool to help remember what makes something alive.
MRS GREN
If something is Alive is must be able to:
- Move - To change direction.
- Respire - Get energy from food.
- Sense - To be able to respond to changes in the environment.
- Grow - Get get bigger.
- Reproduce - To make copies of itself.
- Excrete - To get rid of waste products.
- Nutrition - To take in new materials for growth and repair.
Examples
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- Move - A uses its legs and wings to move in search of food.
- Respire - A fly gets energy from the food they eat.
- Sense - A fly can see with its eyes and taste with its feet.
- Grow - A fly begins its life in an egg and grows into a maggot before becoming a fly.
- Reproduce - Flies can mate to make new flies.
- Excrete - A fly breaths out waste gas and leave droppings of waste material.
- Nutrition - Flies must take in new material by eating food.
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- Move - The leaves of an oak tree will move to aim toward the sun.
- Respire - Trees make their own food and send it around the tree to be used for energy.
- Sense - Oak trees sense the change in temperature and amount of light and lose their leaves in winter.
- Grow - Oak trees begin as a small seed and grow up to 20 metres tall.
- Reproduce - Oak trees make seeds called acorns which can grow into new oak trees.
- Excrete - Oak trees let out waste gases.
- Nutrition - Oak trees take in minerals and water the soil.
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Key Stage 3
Meaning
MRS GREN is an acronym used to help remember the criteria for something to be considered alive.
About MRS GREN
- MRS GREN is a mnemonic, which is a tool to help remember something.
MRS GREN stands for:
- Movement - All living creatures can change direction when moving.
- Respiration - All living creatures can get energy from food.
- Sensitivity - All living creatures can respond to changes in the environment.
- Growth - All living creatures can get bigger by taking on new material.
- Reproduction - All living creatures can make copies of themselves.
- Excretion - All living creatures can get rid of waste materials.
- Nutrition - All living creatures can take on new materials for movement, growth and repair.
Examples
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- Movement - This micro-organism has a tail called a flagellum which it can use to swim.
- Respiration - This micro-organism makes its own food and uses that food for energy.
- Sensitivity - This micro-organism can sense light using an organelle called an eye spot.
- Growth - This micro-organism gets bigger before dividing.
- Reproduction - This micro-organism divides to make two identical copies of itself.
- Excretion - This micro-organism gets rid of waste with a contractile vacuole.
- Nutrition - This micro-organism takes in nutrients from the water around it.
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- Movement -
- Respiration -
- Sensitivity -
- Growth -
- Reproduction -
- Excretion -
- Nutrition -
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