Plant tissues, organs and systems
- Created by: tazzer03
- Created on: 26-11-17 13:23
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- Plant tissues, organs and systems
- plant tissues
- epidermal tissues
- upper
- allows light to pass to mesophyll
- to protect leaf and stop water loss
- thin and transparent waxy cuticle
- maximum light penetration!
- allows light to pass to mesophyll
- lower
- allow gases to diffuse
- many stomata
- covers plant
- upper
- palisade mesophyll
- carries out photosynthesis
- a lot of chloroplasts!
- carries out photosynthesis
- spongy mesophyll
- increases surface area for CO2 absorption
- irregular shaped cells with many air spaces
- allow CO2 and O2 to diffuse between them!
- phloem
- transport dissolved sugars from leaves to rest of the plant
- TRANSLOCATION
- transport dissolved sugars from leaves to rest of the plant
- meristem
- performs mitosis
- made of small cells with thin walls
- found at growing tips of shoots and roots
- xylem
- carry water & minerals from roots to rest of plant
- thick walls made of lignin
- support plant
- vessels are hollow (dead)
- increases surface area
- epidermal tissues
- plant organs
- root
- stem
- leaf
- transpiration
- loss of water vapour from leaves
- lost through stomata
- open to let CO2 in for photosynthesis
- stomata & guard cells control gas exchange & water loss
- lost through stomata
- affected by...
- temperature
- more evaporation when temp increases
- more kinetic energy = quicker movement of particles
- more evaporation when temp increases
- humidity
- LESS transpiration when humidity increases
- concentration in leaf less saturated that in the air
- LESS transpiration when humidity increases
- air flow
- mover wind = more transpiration
- water vapour is blown away maintaining a steep diffusion gradient between inside and outside the leaf
- still air = less transpiration
- water vapour builds up outside leaf
- mover wind = more transpiration
- light intensity
- more light = more photosynthesis
- stomata open
- more light = more photosynthesis
- temperature
- adaptations
- XEROPHYTES
- plants adapted to survive in environment with little water
- cactus
- needles = less surface area
- marram grass = leaves curl
- sunken stomata
- waxy, waterproof cuticle
- most stomata on underside
- XEROPHYTES
- loss of water vapour from leaves
- translocation
- movement of materials from leaves to other tissues
- plant tissues
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