Biology Paper 1: Everything on Plants
- Created by: BethB
- Created on: 21-04-19 10:59
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- Plants
- Organisation
- Plant Tissues
- Epidermal
- Palisade Mesophyll
- Spongy Mesophyll
- Xylem and Phloem
- Meristem
- The epidermal tissues are covered with a WAXY CUTICLE
- REDUCE WATER LOSS
- UPPER EPIDERMIS is transparent so light can pass through it to the palisade layer
- X and P form a network of VASCULAR BUNDLES which deliver water/ nutrients to entire leaf
- Can also SUPPORT the STRUCTURE
- Plant Tissues
- Transpiration
- Rate
- Temperature
- Warmer = faster transpiration happens
- Particle have more energy to evaporate and diffuse out of the stomata
- Warmer = faster transpiration happens
- Light Intensity
- Brighter = greater transpiration rate
- Stomata begin to close as it gets darker - photosynthesis doesn't happen in the dark
- Brighter = greater transpiration rate
- Humidity
- Air Flow
- Better air flow around a leaf = greater transpiration rate
- Poor = water vapour just surrounds the leaf and doesn't move away
- High concentration of water particles outside the leaf as well as inside
- Diffusion doesn't happen as quickly
- High concentration of water particles outside the leaf as well as inside
- Poor = water vapour just surrounds the leaf and doesn't move away
- Better air flow around a leaf = greater transpiration rate
- Temperature
- Transpiration is the loss of water from the plant
- Caused by the evaporation and diffusion of water from a plant's surface
- Evaporation = slight shortage of water in the leaf
- So more water drawn up through XYLEM vessels to replace it
- Constant transpiration stream of water through the plant
- Becaue there's more water inside the plant than the air outside, water escapes from the leaves through the stomata by DIFFUSION
- So more water drawn up through XYLEM vessels to replace it
- Rate
- Translocation
- PHLOEM TUBES transport FOOD
- BOTH DIRECTIONS
- Transport food substances made in the LEAVES to rest of the PLANT
- PHLOEM TUBES transport FOOD
- Plant Defences
- Physical
- Chemical
- Mechanical
- Plant Diseases
- Rose Black Spot
- RBS is a fungus that causes PURPLE or BLACK spots to develop on the leaves of rose plant
- Means less photosynthesis can happen so growth is stunted
- Leaves can turn yellow and drop off
- RBS is a fungus that causes PURPLE or BLACK spots to develop on the leaves of rose plant
- Untitled
- Tobacco Mosaic Virus (TMV)
- Virus that affects many species of plant, including tomatoes
- Causes a mosaic pattern on leaves - parts of the leaves become discoloured
- Plant can't photosynthesise as well, so growth is affected
- Rose Black Spot
- 5 USES of GLUCOSE
- Respiration
- Making Cellulose
- Making Amino Acids
- Stored as oils/ fats
- Stored as Starch
- Adaptations
- Organisation
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