Cells
- Created by: AIV17
- Created on: 31-03-19 15:34
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- Cells
- Characteristics of living things
- Growth
- A permanent increase in size and dry mass by an increase in cell number or cell size or both
- Sensitivity
- The ability to detect or sense stimuli in the internal or external environment and to make appropriate responses
- Reproduction
- The processes that make more of the same kind of organism
- Respiration
- The chemical reactions in cells that break down nutrient molecules and release energy for metabolism
- Excretion
- Removal from organisms of the waste products of metabolism(chemical reactions in cells including respiration),to-xic materials and substances in excess of requirements
- Movement
- An action by an organism or part of an organism causing a change of position or place
- Nutrition
- Taking in of materials for energy, growth and development; plants require light , carbon dioxide, water and ions; animals need organic compounds and ions and usually need water
- Growth
- are surrounded by a
- Cell wall
- made mainly of cellulose
- that form criss-crossing fibres to form a very strong covering that
- protect and support the cell even from bursting because of swelling
- of the polysaccha-rides group
- that form criss-crossing fibres to form a very strong covering that
- Fully permeable
- Inside is:
- Cell membrane
- A very thin layer of protein and fat that controls what goes in and out of the cell
- Partially permeable
- inside is:
- Cell membrane
- made mainly of cellulose
- Cell wall
- Almost all of them can carry out activities which are characteristic of living things, but many of them are specialised on a function.
- Characteristics of living things
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