explain photosynthesis ESchooltoday Home, All Lessons
 

plants and photosynthesisGreen plants make their own food
photosynthesis in green plants
what is light reactions and dark reactions
The internal structure of a leaf
What conditions are needed for photosynthesis
The chloroplast
CO2 for photosynthesis
Sunlight for photosynthesis
Water and photosynthesis
The root structure



NOTES

Other than glucose, which is an important source of carbohydrates, photosynthesis also produces proteins,
fats and water soluble sugars.


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light and photosynthesis

 

Where does photosynthesis take place?

Photosynthesis takes place inside plant cells in small things called chloroplasts. Chloroplasts (mostly found in the mesophyll layer) contain a green substance called chlorophyll. Below are the other parts of the cell that work with the chloroplast to make photosynthesis happen.

Structure of a mesophyll cell
mesophyll layer

What role do these parts play?
plant cellCell walls: provide structural and mechanical support, protect cells against pathogens, maintain and determine cell shape, control the rate and direction of growth and generally provide form to the plant.

plant cellCytoplasm: provides the platform for most chemical processes, controlled by enzymes.

plant cellCell membrane: acts as a barrier, controlling the movement of substances into and out of the cell.

plant cellChloroplasts: As described above, simply contain chlorophyll, a green substance which absorbs light energy for photosynthesis.

plant cellVacuole: the container that hold moisture, and keeps the plant turgid.

plant cellNucleus: this contains genetic make (the DNA), which controls the activities of the cell.

Chlorophyll absorbs the light energy needed to make photosynthesis happen. It is important to note that not all the colour wavelengths of light are absorbed. Plants mostly absorb red and blue wavelengths — they do not absorb light from the green range. 

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green plants make their own food


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