KEY CONCEPT Leaves absorb light and carry out...

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21.4 Leaves KEY CONCEPT Leaves absorb light and carry out photosynthesis.

Transcript of KEY CONCEPT Leaves absorb light and carry out...

  • 21.4 Leaves

    KEY CONCEPT Leaves absorb light and carry out photosynthesis.

  • 21.4 Leaves

    Most leaves share some similar structures.

    • The blade is usually broad and flat. – collects sunlight for

    photosynthesis – connects to the stem by a

    petiole

    blade

    petiole

  • 21.4 Leaves

    • Mesophyll is between the leaf’s dermal tissue layers.

    cuticle

    upper epidermis

    palisade mesophyll

    spongy mesophyll

    lower epidermis

  • 21.4 Leaves

    – Stomata open and close when guard cells change shape.

    – When stomata are open, water evaporates and gas exchanges.

    – Stomata close at night and when plant loses too much water.

    guard cells stoma

    • Guard cells surround each stoma.

  • 21.4 Leaves

    • Leaves may be simple, compound, or double compound.

    Simple leaf Compound leaf Double compound leaf

  • 21.4 Leaves

    • Leaf veins may be parallel or pinnate.

    Pinnate veins Parallel veins

  • 21.4 Leaves

    • Leaf margins may be toothed, entire, or lobed.

    Toothed margin Entire margin Lobed margin

  • 21.4 Leaves

    Most leaves are specialized systems for photosynthesis.

    • There are two types of mesophyll cells. – both types contain chloroplasts – palisade mesophyll absorbs sunlight – spongy mesophyll connects to stomata

    xylem

    phloem

    cuticle

    upper epidermis

    palisade mesophyll

    spongy mesophyll

    stomata

    lower epidermis

  • 21.4 Leaves

    – for extreme temperatures, ex: pine needles

    • Leaves have many adaptations.

  • 21.4 Leaves

    • Leaves have many adaptations. – for extreme temperatures,

    ex: pine needles – for water loss,

    ex: cactus spines

  • 21.4 Leaves

    – for aquatic environments, ex: water lily

    • Leaves have many adaptations. – for extreme temperatures,

    ex: pine needles – for water loss,

    ex: cactus spines

  • 21.4 Leaves

    – for aquatic environments, ex: water lily

    – for getting food, ex: Venus’ flytrap

    • Leaves have many adaptations. – for extreme temperatures,

    ex: pine needles – for water loss,

    ex: cactus spines


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21.4 Leaves KEY CONCEPT Leaves absorb light and carry out photosynthesis.

21.4 Leaves KEY CONCEPT Leaves absorb light and carry out photosynthesis.

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