2.20 Lesson: Leaves and Photosynthesis

2.20 Leaves and Photosynthesis

​This is a quick review of cellular organization.

Photosynthesis & Cellular Respiration

• Reactants of one process....

• ... are the products of the other process

​Quick review of yesterday's lesson: No notes needed

Energy renewal

• Energy captured from sunlight by photosynthetic organisms is used and released in the cellular respiration of living things.

• The energy that living things use, must continually be renewed through photosynthesis.

​Review from yesterday: and from: 2.18 Glucose and ATP lesson

​Review: no notes needed - from 2.19 Chloroplast lesson

Capturing the Sun's Energy

• This energy-capturing process occurs in the leaves and other green parts of the plant.

• Chloroplasts are green organelles inside plant cells. In most plants, leaf cells contain more chloroplasts than other parts of the plant

• Chloroplasts capture the light energy and use it to power the second stage of photosynthesis.

Layers of a Leaf

​A leaf consists of the following layers:

​1. Cuticle

​2. Upper epidermis

​3. Palisade mesophyll

​4. Spongy mesophyll

​5. Lower epidermis

​6. Pores (openings) also known as stomata

Cuticle - ​Thick, waxy covering that protects plants from drying out

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​Epidermis - Single, protective layer of cells

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​Mesophyll - Conducts photosynthesis, has chloroplasts 

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​Stomata - Allow gases into and out of the leaf for photosynthesis

Guard Cells - Control the opening and closing of stomata
Transpiration - Process of leaves losing water vapor through the stomata.

​Key notes page! Also draw and label
(3 minutes)

​You will be expected to label this in the Quiz: Write in your notebook and label for the Openbook Quiz that you will have 7 minutes to finish.