Photosynthesis

Science 06-03-2013

Topic of today

• Topic: Photosynthesis

• Learning goals:– After todays lesson you will be able to:• Describe what is photosynthesis• List the reaction formula for the process of

photosynthesis• Explain in where in plants photosynthesis takes places• Explain why and how plants can survive only from light,

air and water

Photosynthesis

• What was photosynthesis again?

Energy

• ... + ... ... + ...

Photosynthesis

• What was photosynthesis again?

Sunlight Energy

• CO2 + H2O Glucose + O2

Photosynthesis

• Take a look around you…• Now answer the following question:– What wouldn’t exist in this classroom if

photosynthesis wouldn’t exist?

Photoautotrophs

Photosynthesis - Carbon assimilation

• Most autotrophic organisms get energy-rich electrons by using light– Photo-autotrophic– Carbon-assimilation = photosynthesis

• Plants and some bacteria contain green pigments which enables photosynthesis to take place

• In plant cells this photosynthetic pigments can be found in the chloroplasts

Location of photosynthesis• Chloroplasts are found mainly in the cells of the

mesophyll, the tissue in the interior of the leaf.

• Carbon dioxide enters the leaf, and oxygen exits, by way of microscopic pores called stomata

• Water absorbed by the roots is delivered to the leaves in veins

• A chloroplast has an envelope of two membranes surrounding a dense fluid called the stroma.

• Suspended within the stroma is a third membrane system, made up of sacs called thylakoids, which segregates the stroma from the thylakoid space inside these sacs.

• Chlorophyll, the green pigment that gives leaves their color, resides in the thylakoid membranes of the chloroplast.

Breatharians

Experiment + Lab Report

• Elodea