I) Research Question: To what extent does light effect the rate of photosynthesis in green spinach leaves? II) Hypothesis: If the leaf is exposed to light in the presence of a Carbon source, then the leaf disks float to the surface of the solution due to an increased rate of Oxygen (O2) production through photosynthesis. III) Hypothesis Explanation: when light is absorbed by leaf pigments such as chlorophyll A or B, electrons within each photosystem are boosted to a higher energy level. Leafs then produce Adenosine Triphosphate (ATP) to reduce NADPH (ferredoxin), and incorporate Carbon dioxide (CO2) into organic molecules in a process called carbon fixation. When leaves are put in the water and undergo the process of the light-dependent reaction,
Haya Al-Khater Mr. Gurney Biology HL December 1, 2014 The Effect of Light intensity on rate of photosynthesis Research question- How does light intensity affect the rate of photosynthesis in Spinach leaves (Spinacia oleracea)? Hypothesis- My hypothesis is that light intensity and photosynthesis rate have a positive correlation. Meaning that as light intensity increases, photosynthesis rate will increase. This is because as light intensity increase, the rate of light-dependent reactions increase since light dependent reactions use light as an energy source. When light hits the surface of the leaf, it is absorbed by chlorophyll pigments.
"Transpiration is the process where plants absorb water through the roots and then give off water vapor through pores in their leaves. An example of transpiration is when a plant absorbs water in its roots." Plants have several ways of controlling the amount of water they lose from the leaves. Presence of a cuticle - A cuticle is a waxy layer on the upper surface of leaves ( water cannot pass through it). It prevents the loss of too much water from the plant.
As oxygen was a visible product, we counted the oxygen bubbles made when we moved the source of light. Hypothesis: Plants need light to photosynthesize. In this experiment, the light intensity is changed by changing the distance of the source of light closer or further away from the elodea, so theoretically, when the intensity becomes stronger due to the light source being closer to the Elodea, the rate of photosynthesis should increase and
So it needs to pair up with other pigments that captures the wavelengths of light that chlorophyll misses especially the blue spectra and another function of these other pigments is to protect the leave from UV damage, an example for this kind of pigment is Xanthophyll. The reason why plant leaves are green is because the leave absorbs all the wavelengths of light except the green ones and the reflection of green is what we
Research Question: How does the presence of light impact the rate of transpiration in plants? Aim: The aim of this experiment was to investigate how the presence of light affects the rate of transpiration in plants. Hypothesis: As light intensity increases, the rate of transpiration (water uptake) in a plant increases. Background Information: In this experiment I will be investigating the impact of light intensity on the rate of water uptake, due to transpiration, by attaching a shoot from a leafy plant in the capillary tube of a potometer, and then measuring how long it takes for a bubble to move a set distance. The faster the bubble moves, the greater the rate of transpiration.
When the leaves go through the process of a light-dependent reaction by being placed in water, oxygen is created through photosynthesis and is released into the interior of the leaf. This causes the leaf to rise. However, since cellular respiration is happening at the same time, the oxygen is also being used up. This means that the leaves must
In this experiment, the earthworms spent more time in the dark area than the light (Figure 1). The time spent in the dark observed was 1.6 times longer than the expected statistical time if their movement was random (t-test: t=3.3330, DF= 19, p=0.0035; Figure
This also applies to sun tans where sun stimulates melanocytes to multiply making the skin brown. Light not only does this but also reacts with other things. When hydrogen peroxide is kept in dark bottles, it is kept so that light can initiate a chemical degradation process. This proves that light almost affects
Chloroplasts are organelles that carry on photosynthesis; carbon dioxide diffuses into the chloroplasts in the leaves (Mader, S. 2010). Sugar and oxygen are released during the process. In order to photosynthesize, plants depend on light energy from the sun. The rate of photosynthesis will increase or decrease depending on the colour of light being absorbed, blue light results in the most photosynthesis occur and green light results in no photosynthesis occurring. Oxygen is released during the day and taken in at night through the stomata, which are small openings on the surface of the leaf.