Biology Unit 2A
A mind map of the UNIT2A topics in GCSE biology, CELLS and PLANTS. This is from the AQA specification. Its purpose is for easy revision of key points.
- Created by: Dan Flatters
- Created on: 24-11-12 15:30
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- Biology Unit 2
- CELLS
- Cell Features
- ANIMALS- nucleus, cytoplasm, ribosomes, mitochondria, cell membrane
- Plant-nucleus, cell wall, cell membrane, vacuole, chloroplasts, cytoplasm, mitochondria, ribosomes
- Specialized Cells
- CONE CELL- Visual Pigment, detects light and sends stimulus to the brain. concentrated in the retina.
- ROOT HAIR CELL- Root Hair, it has a large surface area so it can collect more water through diffusion.
- SPERM CELL- Tail, stream lined head. it has a long tail for fast mobility and its head is streamlined.
- FAT CELL- Fat Store, it stores extra fat as its cell wall can expand.
- Diffusion/ Osmosis
- OSMOSIS
- If a body cell is surrounded by a high salt concentration, the size of the cell will decrease as more water is being passed out of the cell to create an equilibrium
- If a cell is surrounded by pure water it makes the cell inflate due to the cell trying to reach an equilibrium through osmosis.
- DIFFUSION
- The spreading out of particals from a high concentration to a low concentration
- spreads out until it meets an Equilibrium
- OSMOSIS
- Tissues, Organs and Organ Systems
- Tissues are a group of similar cells that work together to carry out a specific function
- Muscular Tissue
- Glandular Tissues
- Epithelial Tissues
- Organs are structures of cells of the same and different type that work together to carry out a specific function.
- The Heart
- The stomach
- The large intestine
- Organ Systems are groups of organs that work together to carry out a specific function
- Digestive System
- Saliva Glands, Liver, Stomach, Gall Bladder , Pancreas, Small Intestine, Large Intestine
- Respiratory
- Circulatory
- Digestive System
- Tissues are a group of similar cells that work together to carry out a specific function
- Cell Features
- PLANTS
- Photosynthesis Limiting Factors
- CO2
- as the CO2 levels increase so will the rate of photosynthesis but will eventually level off due to the other limiting factors.
- LIGHT INTENSITY
- TEMPERATURE
- As the temperature around a plant increases so will the rate of photosynthesis. until the temperature reaches a certain level inwhich it will suddenly decline. This is because the enzymes in the plant denature.
- CO2
- Glucose in plants
- Glucose is used to makes starch as starch is insoluble so no glucose is wasted.
- GLUCOSE USES
- Plants make glucose when they photosynthesis and goes towards:
- Cell Functions, Growth, Reproduction, Storage
- Organisms
- DISTRIBUTION
- Factors Effecting Distribution
- O2
- Light
- Temperature
- Light - more plants in areas with more light, plants get taller and grow earlier in the season
- Factors Effecting Distribution
- DISTRIBUTION
- Photosynthesis Limiting Factors
- CELLS
- The movement of water across a selectively permeable membrane
- OSMOSIS
- If a body cell is surrounded by a high salt concentration, the size of the cell will decrease as more water is being passed out of the cell to create an equilibrium
- If a cell is surrounded by pure water it makes the cell inflate due to the cell trying to reach an equilibrium through osmosis.
- Movement due to a concentration gradient
- Important in red blood cells, kidney tubes and the large intestine
- OSMOSIS
- As the levels of light increases so will the rate of photosynthesis but will eventually level off due to other limiting factors.
- LIGHT INTENSITY
- GLUCOSE -> LIPIDS
- GLUCOSE USES
- GLUCOSE -> CELLULOSE
- GLUCOSE + NITRATES -> AMINO ACIDS
- GLUCOSE -> CHLOROPHYLL
- Climate
- Factors Effecting Distribution
- O2
- Light
- Temperature
- Factors Effecting Distribution
- PH of soil
- Space
- Water
- CO2
- Nutrients Avalible
- CO2- more plants in areas with high amounts of CO2, plants will have larger leaves= more surface area
- DISTRIBUTION
- Light - more plants in areas with more light, plants get taller and grow earlier in the season
- DISTRIBUTION
- O2- more plants in areas with high levels of O2, plants have more STOMATA and the STOMATA stay open for longer
- Water- more plants grow around water sources, more root hair cells are present to take in water, large/shallow roots
- Measuring Distribution
- Organisms
- SAMPLING
- Count the organisms in the QUADRAT
- the areas must be random
- you must sample more than 1 are so the mean number can be calculated, know as QUANTATIVE SAMPLING
- Date Collection
- EG. 10 Quadrats of an area of 0.25m2 were used. what is the total area of the area sampled?
- 0.25X 10 = 2.5M2
- EG. 10 Quadrats of an area of 0.25m2 were used. what is the total area of the area sampled?
- TRANSECTS
- line transects are most commonly used
- tape is stretched between two points
- Sampling is carried out at regular intervals along the transect
- Organisms
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