Monday, August 2

What is the best condition for photosynthesis in the science lab?
Our Photosynthesis Experiment!
Whether temperature of water affects the rate of photosynthesis in the plants.

Example of our experiment (It is not pond water, but tape water)
Firstly there will be 3 sample. Each sample will have different temperatures of water. There will be: a warm water sample, cold water sample and a room temperature water sample.

Rates of photosynthesis are affected by many ways!
The rate of photosynthesis is affected by a number of factors including light levels, temperature, amount of water, amount of nutrients. If the condition that the plants needs are improved, the rate of photosynthesis should also increase.

Temperature
Take it for example if we were to increase the temperature from 10 degrees to 20 degrees. Will the rate of photosynthesis increase in double too? Yes! This is so as the enzymes in the plants will be closer to their optimum working temperature. Ad temperature increases, the molecules in the cells will be moving at a faster rate due to kinetic energy theory. However, if the temperature were to increase to a certain level, the rate of photosynthesis will drop as the plant's enzymes are denatured. Therefore, they are more likely to join onto the enzymes and react. But will there by any difference if we were to let the temperature in the environment remain the same, but the temperature of water that the plant absorbs change? That is for us to find out!


What can photosynthesis affect?
Many would know hat light plays a very vital role for photosynthesis in plants. But do you know that plants sensitivity to light plays a role in the control of plant structural development(Morphogenesis). The use of light to control structural development is called photomorphogenesis, and it is dependent on the presence of specialized photoreceptor, which are the chemical pigments capable of absorbing specific wavelengths of light.


Plants use 4 kinds of photoreceptor:
-Phytochrome
-Cryptochrome
-A UV-B photoreceptor
-Protochlorophyllide a

Phytochrome and Cytochrome
They are photoreceptor proteins which are complex molecules structures formed by joining a protein with a light-sensitive pigment.
Cytochrome is also known as the UV-A photoreceptor, because it absorbs ultraviolet light in the long wave "A" region.

UV-B photoreceptor
It is one or more compounds that have yet to be identified with certainty.

Protochlorophyllide a
As its name suggested, it is a chemical precursor of chlorophyll

Wavelengths

White light is separation into the different colours(=wavelengths) of light by passing it through a prism. Wavelength is define as the distance as the distance from peak to peak(Or trough to trough). The energy of it inversely proportional to the wavelength. Thus, the longer the wavelength, the the lesser energy.


Wavelengths and other aspects of the wave nature of lights

The orders of the colours is determined by the wavelength of light. Visible light is one small part of the electromagnet spectrum. The longer the wavelength of visible light, the more red the colour. Likewise, the shorter the wavelengths are towards the vilet side of the spectrum. Wavelengths which are longer then red are referred to as infrared, while those shorter then violet are ultraviolet.

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