1. Leaves S7-3-1 Look! Vascular tissue!

2. 1 main function of a leaf Make food It uses the process photosynthesis to make food for the plant (more on this later!)

3. 2 types of leaves Simple—blade in one piece Ex. maple, oak, apple trees Compound— blade is divided into many leaf- like parts Ex. marigold, sensitive plant

4. Photosynthesis Food is synthesized (made) using sun’s energy Sun’s energy is captured by chlorophyll (green pigment in the leaf) Chemical reactions take place—sugar (AKA glucose AKA C 6 H 12 O 6 ) 6H 2 O + 6CO 2 ----------> C 6 H 12 O 6 + 6O 2 C 6 H 12 O 6 **AKA = Also Known As Add sunlight

5. Parts of a leaf Mesophyll: inner part of leaf Veins: Phloem & xylem Cuticle: waxy covering, prevents excess water loss Epidermis: outer covering Palisade mesophyll: most chloroplasts located here Spongy mesophyll: gases (CO 2 & O 2 ) are exchanged here Stoma: opening for CO2 to come in & O2 to go out Guard cells: Surround stoma, regulate its opening & closing Enlarged view: **I apologize for this blurriness of this picture! It is as if the leaf is cut in half and you are looking at a side view!

6. Transpiration Water is evaporated through the leaves by the sun Each time a water droplet is “picked up,” it pulls the next droplet through This is how the water gets from the roots to the leaves Red arrows show the path of the water

7. Specialized leaves #1 Tendrils—Thin leaves that reach out and “lasso” objects to help plant extend itself Ex. peas, pumpkins Spines—Thin, pointy leaves; help to reduce water loss Ex. Cacti

8. Specialized leaves #2 Reproduction— “babies” drop from the grown leaf Ex. Spider plant Kalanchoe “Fake petals”—Some leaves are brightly colored and look like petals (to attract pollinators) Ex. Poinsettias

9. Specialized leaves #3 Carnivorous plants—some leaves catch insects to eat sundew insects get stuck on sticky drops on leaves Pitcher plant Insects land on leaf and slide down into digestive juice Venus flytrap Snap shut when insect lands on leaf

10. We EAT the leaves of many plants! Specialized leaves #4 FOOD! Cabbage Herbs, such as parsley and basil Spinach Lettuce Bulbs: Onion and garlic Cloves

11. Questions : Please answer of separate piece of paper 1. List the one main function of a leaf. 2. What category of leaf is shown here: 3. What 2 substances react with each other during photosynthesis? 4. What 2 substances are produced through photosynthesis? 5. Can a plant make food in the dark? Explain. 6. What part of the leaf captures the sun’s energy? In which section of the leaf are these organelles located? 7. What is the job of the cuticle? 8. In which direction does transpiration move water? 9. Name 3 specialized functions of leaves (besides food). 10. List your 3 favorite leaf foods.