What is the purpose of the syringe Bozeman leaf disk lab?
An empty syringe is used to remove gas from the leaves before the lab. As the chloroplasts absorb light they produce oxygen bubbles which eventually cause the leaves to float.
What is the point of the photosynthesis lab?
Objectives: To test the ability of plants to synthesis their food (sugars). To demonstrate the effect of light, carbon dioxide and chlorophyll on photosynthesis.
What is the variable in the photosynthesis in leaf disks experiment?
For example the one independent variable is the “light intensity” and the dependent is the “rate of photosynthesis” in leaf discs.
How does the photosynthesis lab work?
The light source provides light energy, the solution provides water, and sodium bicarbonate provides dissolved CO2. Plant material will generally float in water. This is because leaves have air in the spaces between cells, which helps them collect CO2 gas from their environment to use in photosynthesis.
What happens if you remove air from stomata?
If you draw the gases out from the spaces, then the leaves will sink because they become more dense than water. If this leaf disk is placed in a solution with an alternate source of carbon dioxide in the form of bicarbonate ions, then photosynthesis can occur in a sunken leaf disk.
Why do leaves float after photosynthesis?
Leaf disks float, normally. When the air spaces are replaced with water the overall density of the leaf disk increases and the disk sinks. As photosynthesis proceeds oxygen is released into the interior of the leaf which changes the buoyancy–causing the disks to rise.
For what purpose was Exercise 8.2 performed?
To determine the volume of oxygen produced during photosynthesis.
What factors affect the rate of photosynthesis in living leaves lab?
The main factors affecting rate of photosynthesis are light intensity, carbon dioxide concentration and temperature.
How did your variable affect the rate of photosynthesis?
Any change in the level of a limiting factor will affect the rate of reaction. For example, the amount of light will affect the rate of photosynthesis. If carbon dioxide and light levels are high, but temperature is low, increasing temperature will have the greatest effect on reaching a higher rate of photosynthesis.
Why do leaves sink in water?
Leaf Structure and Function The spongy mesophyll layer is normally infused with gases, oxygen and carbon dioxide. Leaves (or disks cut from leaves) will normally float in water because of these gases. If you draw the gases out from the spaces, then the leaves will sink because they become more dense than water.
Can plants survive without stomata?
Because plants must exchange gases through their stomata, closing them prevents plants from taking up carbon dioxide (CO2). These species are called isohydric, and tend to do poorly during droughts, because without the gas exchange that open stomata allow, they cannot produce carbohydrates for survival.
Can photosynthesis occur in the dark?
Plants and Respiration Plants respire all the time, whether it is dark or light, because their cells need energy to stay alive. But they can only photosynthesize when they have light.
What are the six steps of photosynthesis?
When Leaves open their pores which is known as stomata.
What are the three things needed for photosynthesis?
To perform photosynthesis, plants need three things: carbon dioxide, water, and sunlight. By taking in water (H2O) through the roots, carbon dioxide (CO2) from the air, and light energy from the Sun, plants can perform photosynthesis to make glucose (sugars) and oxygen (O2).
What are the results of photosynthesis?
The result of photosynthesis is glucose, which is stored as chemical energy in the plant cells. This stored chemical energy comes from the conversion of inorganic carbon (carbon dioxide) into organic carbon. Respiration releases the stored chemical energy.
What is the summary of photosynthesis?
In summary, photosynthesis is a process in which light energy is converted to chemical energy and used to produce organic compounds. In plants, photosynthesis typically occurs within the chloroplasts located in plant leaves.