How much sun does a seed need to sprout?

What need plants in order to grow?

What side of a plant leaf takes in carbon dioxide?

The Effects of pH Levels and Phosphorous on the Photosynthesis Process of Aquatic PlantsStudy the coniferous spruce tree (Picea glauca as the species of choice) by measuring its lateral and sub-lateral branch angles in order to see how it collects sunlight from various angles on its south-facing side.

(what is stomata?)How do plants make food (photosynthesis basics)?

Follow in the steps of van Helmont, John Woodward, Joseph Priestley and Jan Ingenhousz and discover photosynthesisIs plant growth affected by exposure to ultraviolet light?

These kinds of observations led Priestley to offer an interesting hypothesis that plants restore to the air whatever breathing animals and burning candles remove.

But here we animals repay the favor.

So the hypothesis that water is the nutrient used by plants was rejected.

Repeat John Woodward's experiment:

In August of 1771, , an English Chemist, put a sprig of mint into a transparent closed space with a candle that burned out the air (oxygen was not discovered yet) until it soon went out.

Effects of different colors of light on plant growth.

Nucleus: 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 color wavelengths of light are absorbed. Plants mostly absorb red and blue wavelengths — they do not absorb light from the green range.


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

Where does photosynthesis take place?

The Effects of Elevated Carbon Dioxide Levels on the Transpiratoin Rates of Zonal Geranium PlantsHow Does the Introduction of NaF Affect the Rate of Photosynthesis in Isolated Chloroplasts?


In a series of experiments over as many as 77 days, Woodward measured the water consumed by plants.

For example, one plant showed a mass gain of about 1 gram, while Woodward had added a total of almost 76,000 grams of water during the 77 days of plant growth - this was a typical result.

The effect of light on seed germinationWhat is Transpiration?

The Effects of Different Colored Lights on Algal Oxygen ProductionPhotosynthesis Background Resources