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m s

on 9 March 2013

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Transcript of Photosynthesis

Photosynthesis What is photosynthesis? The word photosynthesis, photo + synthesis comes from the Greek words φώς which means light and σύνθεση which means combination. Definition The process with which plants use the simple inorganic molecules carbon dioxide and water, in the presence of chlorophyll and light, to make glucose and oxygen is called photosynthesis. EQUATION Word equation carbon dioxide + water light energy chlorophyll glucose + oxygen Balanced chemical equation leaf stalk main vein leaf blade branching vein The cuticle is a waxy material that covers the upper and lower epidermis. It reduces water loss by evaporation and acts as a barrier to the entry of harmful microorganisms
The stomata are pores that are mainly situated at the lower epidermis of the leaf. They allow carbon dioxide to diffuse into the leaf and oxygen and water vapour to diffuse out
The palisade cells are elongated cells situated in the mesophyll of the leaf. They are the main site of photosynthesis due to the large number of chloroplasts they contain.
The spongy cells are also situated in the mesophyll of the leaf. These cells form the main gas exchange surface of the leaf. They absorb carbon dioxide and release oxygen and water vapour.
The xylem is a tissue that transports water and mineral ions to all the parts of the leaf
The phloem is a transport system that supplies all the other parts of the plant with the products of photosynthesis. Chloroplasts Chloroplasts are organelles that are situated in the green parts of plants especialy in the leaves.
They are green due to the green pigment called chlorophyll that they contain and they are members of a class of organelles called plastids.
Their main function is photosynthesis where they capture the sun's light energy and store it in energy storage molecules while breaking down water molecules. Chlorophyll Chlorophyll is a green pigment found in cyarobacteria and in chloroplasts of algae and plants and it is responsible for the green colour of chloroplasts.

It is a biomolecule critical in the process of photosynthesis as it allows plants to absorb energy from light. Simple photosynthesis experiment Identifying chlorophyll in leaves of a plant Materials: scissors
glass jars
coffee filters
acetone Cut up two or three large green leaves

Mix the leaf pieces in acetone and let sit for a day

Cut the coffee filters into strips and dip one end into the acetone

As the plant chemicals release by the acetone move up the filter paper

A strip of green becomes visible, this is the chlorophyll Sources: Edexel IGCSE Biology Student Book
www.vector-images.com by Maria Soderquist
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