plants respire only when there is no light ..

Aim To see whether light effects the rate of Photosynthesis in plants or not....

the chloroplast only in the presence of light

All organisms, animals and plants, must obtain energy to maintain basic biological functions for survival and reproduction. Plants convert energy from sunlight into sugar in a process called photosynthesis. Photosynthesis uses energy from light to convert water and carbon dioxide molecules into glucose (sugar molecule) and oxygen (Figure 2). The oxygen is released, or “exhaled”, from leaves while the energy contained within glucose molecules is used throughout the plant for growth, flower formation, and fruit development.

The Plan In my experiment I am going to see how light affects the rate of photosynthesis.

Plants only photosynthesise in light - they respire all the time.

There are four things that are required by the plant before it can carry out photosynthesis, they are light, chlorophyll, carbon dioxide and water ....

This process is also affected by the temperature surrounding the plant (the species of plant we experimented with, pond weed, photosynthesised best at around 20 degrees centigrade.) Light, temperature & CO2 are known as limiting factors, and each is as important as the next in photosynthes...


Photosynthesis Practical :: Papers

All living things get the energy they need to live from a chemical reaction called respiration. This process needs glucose as a starting point. First we'll see how respiration works, and then look at how plants use respiration in combination with photosynthesis.

BBC - KS3 Bitesize Science - Food chains : Revision, Page 4



My results do agree with my prediction to a certain extent, because I
predicted that the rate of photosynthesis would increase as the light
intensity did because the light provides energy for the reaction, and
the more energy the plant has, the faster it will be able to
photosynthesise.

10/01/2018 · Respiration in plants

Photosynthesis usually results in a net food gain (net glucose gain), once respiration has been accounted for. This means that there is an increase in the biomass of the plant.

Plant cells respire, just as animal cells do

It will be very interesting to see how light will influence the rate of photosynthesis in plants and what will happen if they do not get the required light in order to produce starch .

If they stop respiring, they will die


I thought this because as the light intensity is becoming higher and
higher, I expected something to take over as the limiting factor (the
factor in the shortest supply, such as temperature or carbon dioxide
concentration), and prevent the plant from photosynthesising any
faster.

Free rate of photosynthesis Essays and Papers - …

All of the cells in a plant do cellularrespiration, but not all do photosynthesis. Lookat a tree. How much of it is green? The entiretree (except the outer bark) is living cells. Some are deep inside the trunk or roots. Theynever do photosynthesis. So where do they gettheir energy? From the sugar that the leaves make. The sugar and other stuff move around in the treesap. The cells that don’t do photosynthesis aredoing cellular respiration all day long to gettheir energy from the sugar.