BIOL 1000 Lecture Notes - Lecture 3: No. 12 Group Raf, No. 5 Group Raf

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30 Nov 2015

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The effect of light intensity on photosynthetic rate of the species: cabomba. When the distance of light is closer to the treatments and the light intensity increases than photosynthetic rate also increases is closer to the treatment the photosynthetic rate will increasue due to energy the light will produce. The electron goes from ground to excited state producing more product. Nadph from light reactions which will increase the rate of reactions. When the distance of light is further and the light intensity decreases. As light intensity increases, the photosynthetic rate increases until a point is reached where the rate begins to level off. At low light intensity, photosynthesis occurs slowly because only a small quantity of atp and nadph is created by the light dependent reactions. When both data sets are compared it can be said that the data of treatment were statistically significant.

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The blue part of the light spectrum has been associated with leaf characteristics which also develop under high irradiances. In this study blue light doseâresponse curves were made for the photosynthetic properties and related developmental characteristics of cucumber leaves that were grown at an equal irradiance under seven different combinations of red and blue light provided by light-emitting diodes. Only the leaves developed under red light alone (0% blue) displayed dysfunctional photosynthetic operation, characterized by a suboptimal and heterogeneously distributed dark-adapted F v /F m , a stomatal conductance unresponsive to irradiance, and a relatively low light-limited quantum yield for CO 2 fixation. Only 7% blue light was sufficient to prevent any overt dysfunctional photosynthesis, which can be considered a qualitatively blue light effect. The photosynthetic capacity (A max ) was twice as high for leaves grown at 7% blue compared with 0% blue, and continued to increase with increasing blue percentage during growth measured up to 50% blue. At 100% blue, A max was lower but photosynthetic functioning was normal. The increase in A max with blue percentage (0â50%) was associated with an increase in leaf mass per unit leaf area (LMA), nitrogen (N) content per area, chlorophyll (Chl) content per area, and stomatal conductance. Above 15% blue, the parameters A max , LMA, Chl content, photosynthetic N use efficiency, and the Chl:N ratio had a comparable relationship as reported for leaf responses to irradiance intensity. It is concluded that blue light during growth is qualitatively required for normal photosynthetic functioning and quantitatively mediates leaf responses resembling those to irradiance intensity.

What is the additional materials and equipment needed and what is the possiable issue and what is the data that author tried to observed in this experiments and what relvent to and what the author trying to summerize?

1. The absorption of light by light harvesting complexes and transfer of that photon to one or two reaction centers represents one of the most complex and structurally ordered systems in biology. Four-part question.

a. Describe the structurally arrangements of light harvesting chromophores from purple photosynthetic bacteria, green photosynthetic bacteria and chloroplasts.

b. Describe the movement of a photon of light from the light harvesting complex(s) to the photosynthetic reaction centers in purple photosynthetic bacteria, green photosynthetic bacteria and chloroplasts.

c. In chloroplasts has does the organelle control distribution of photons of light between photosystem I and photosystem II.

d. Considering the similarities between photosynthetic reaction centers in purple photosynthetic bacteria, green photosynthetic bacteria and chloroplasts what do you think was the driving force for the differences between light harvesting complexes.

Mark all correct statements about the supergroup, Archaeplastida.

Archaeplastida includes all of the photosynthetic organisms on Earth

Archaeplastida includes only species that are descended from an ancestor that is thought to have become photosynthetic by engulfing a photosynthetic prokaryote

Archaeplastida includes all of the photosynthetic eukaryotes on Earth

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BIOL 1000 Lecture Notes - Lecture 3: No. 12 Group Raf, No. 5 Group Raf

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