PHOTOSYNTHESIS,2

AIM: How are green plants adapted for photosynthesis?

Do now: If you were designing an efficient leaf for photosynthesis, describe the characteristics you would include and explain why.

Vocabulary- adaptation, epidermis, stomata, palisade layer, veins.

It is the main organ for photosynthesis in most green plants.

http://www.brainpop.com/science/cellularlifeandgenetics/photosynthesis/

Adaptation The leaf is adapted to carry out the

process of photosynthesis

the leaf solves how to make food

A- Provides large surface area for absorption of light energy

LEAF ANATOMY

Compare and contrast Spongy layer and Palisade layer of a leaf

Spongy layer vs. Palisade layer

At night the pores close, opening in the daytime

Guard cells maintain HOMEOSTASIS (stable condition inside plant cells)

http://www.brainpop.com/science/cellularlifeandgenetics/photosynthesis/

Adaptation The leaf is adapted to carry out the

process of photosynthesis

the leaf solves how to make food

Analyze the structures of the leaves below

Features of leavesAdaption PurposeLarge surface area To absorb more light

ThinShort distance for carbon dioxide to diffuse into leaf cells

ChlorophyllAbsorbs sunlight to transfer energy into chemicals

Network of veinsTo support the leaf and transport water and carbohydrates

Stomata Allow carbon dioxide to diffuse into the leaf

Structure of leaves Adaption PurposeEpidermis is thin and transparent

To allow more light to reach the palisade cells

Thin cuticle made of wax

To protect the leaf without blocking out light

Palisade cell layer at top of leaf To absorb more light

Spongy layerAir spaces allow carbon dioxide to diffuse through the leaf, and increase the surface area

Palisade cells contain many chloroplasts

To absorb all the available light

Which structures are listed in order from the least complex to the most complex?

(1) plant cell, leaf, chloroplast, rose bush(2) chloroplast, plant cell, leaf, rose bush(3) chloroplast, leaf, plant cell, rose bush(4) rose bush, leaf, plant cell, chloroplast

Regents question practice

In some land plants, guard cells are found only on the lower surfaces of the leaves. In some water plants, guard cells are found only on the upper surfaces of the leaves. Explain how guard cells in both land and water plants help maintain homeostasis. In your answer be sure to:

• identify one function regulated by the guard cells in leaves

• explain how guard cells carry out this function

EXIT SLIPHow do guard cells of a leaf help to maintain homeostasis in a plant?

http://www.thefullwiki.org/GCSE_Science/Photosynthesis Limiting Factors Photosynthesis requires the following 3 factors: Carbon dioxide Water Light There are a 3 factors which affect the rate at

which a plant can make glucose by photosynthesis. The Concentration of Carbon Dioxide The Light Intensity The Temperature