DENDROLOGY

Detailed explanation-1: -Count the number of bubbles emerging from the cut end of the stems in one minute. Repeat the count five times and record your results. Calculate the average number of bubbles produced per minute. Repeat the experiment at different distances away from the light source.

Detailed explanation-2: -For a given light intensity, the rate of photosynthesis will be measured by measuring the volume of gas displaced in a set amount of time.

Detailed explanation-3: -Measuring photosynthesis via the uptake of carbon dioxide Using an IRGA – Uptake of CO2 can be measured with the means of an IRGA (Infra-Red Gas Analyser) which can compare the CO2 concentration in gas passing into a chamber surrounding a leaf/plant and the CO2 leaving the chamber.

Detailed explanation-4: -An increase in light intensity will produce an increase in the rate of photosynthesis until a level of light intensity is reached [normally 38% 1] above which the rate does not increase because the light saturation point has been reached and another factor (CO2 concentration or temperature) is limiting.

Detailed explanation-5: -A common experiment when studying plant biology is investigating factors affecting the rate of photosynthesis. Plants produce oxygen which is invisible and odorless, so the experiment is usually carried out with water plants; the bubbles of oxygen produced are observed.