KEY CONCEPT Leaves absorb light and carry out photosynthesis.

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Presentation transcript:

KEY CONCEPT Leaves absorb light and carry out photosynthesis.

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

Mesophyll is between the leaf’s dermal tissue layers. cuticle upper epidermis palisade mesophyll spongy mesophyll lower epidermis

Guard cells surround each stoma. 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

There are two types of mesophyll cells. Most leaves are specialized systems for photosynthesis. (don’t memorize this, it is just background info) 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

Leaves have many adaptations (you’ll get to this later in the year) . for extreme temperatures, ex: pine needles

Leaves have many adaptations. for extreme temperatures, ex: pine needles for water loss, ex: cactus spines for aquatic environments, ex: water lily

Leaves have many adaptations. for extreme temperatures, ex: pine needles for water loss, ex: cactus spines for aquatic environments, ex: water lily for getting food, ex: Venus’ flytrap

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