plants angiosperms vs gymnosperms leaf structure adaptations n.
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Plants Angiosperms vs Gymnosperms Leaf Structure/Adaptations. What are the parts of a leaf? Cuticle-waxy covering to protect from water loss Palisade layer- column shaped cells containing chloroplasts, site of most photosynthesis

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Presentation Transcript
slide2

What are the parts of a leaf?

  • Cuticle-waxy covering to protect from water loss
  • Palisade layer- column shaped cells containing chloroplasts, site of most photosynthesis
  • Spongy mesophyll- loosely packed with air spaces allowing gases to circulate
  • Stomata- openings in leaf for gas exchange
  • Guard cells- cells which control the size of the stomata
add transpiration
Add transpiration

The evaporation of water from plants.

How does this help the plant maintain homeostasis?

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Leaf adaptations

  • spines- cactus spines protect the plant from predators & water loss

B. Tendrils- leaflets that are modified for climbing

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C. Thick leaves- modified for water storage

D. Pitcher type leaves-modified for catching insects

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Gymnosperms;

  • Non flowering vascular plants
  • Example: conifer
  • 1. Cone bearers: seeds found on scales of cone
  • 2. Needle like leaves with tough cuticle
  • 3. Shallow roots
  • 4. Bark to reduce water loss
  • 5. Evergreens: retain leaves all year
  • 6. Male cone produces pollen
  • 7. female cone produces seeds
plant responses
Plant Responses

Tropism-

a plants response to its environment.

There are 3 types

geotropism
Geotropism

A plants response to gravity

phototropism
Phototropism

A plants response to light

thigmotropism
Thigmotropism

A plants response to touch