of respiration and photosynthesis
Photosynthesis occurs in the chloroplasts and consists of two linked processes called the light reactions and the ..
Do carrots do photosynthesis? | Yahoo Answers
Without enough light, a plant cannot photosynthesise very quickly, even if there is plenty of water and carbon dioxide. Increasing the light intensity will boost the speed of photosynthesis.
The first event in photosynthesis - the primary photoevent-is always the absorption of a photon by a pigment. The most abundant(and effective) pigments are chlorophylls a and b. However, asyou will see in part B, chlorophylls can only absorb a portion of thevisible spectrum. To use light which is not absorbed by chlorophyllsplants employ accessory pigments, primarily carotenoids andxanthophylls. In this exercise you will examine the pigmentsextracted from several different plant tissues.
Biology of a Plant: Carrot Function | Home Guides | SF Gate
Report your findings on your datasheet in the usual format. In your introduction you should explain (one sentence) what photosynthetic pigments are, why you are interested in determining the absorption spectrum of a leaf, and what you specifically set out to do in this experiment. Your results should explain briefly why you performed the experiment, where the results are, and what the key results were. They should also include a table of raw data, and a figure in which you have plotted absorbance vs. wavelength. In your discussion you should explain why some regions of the spectrum are absorbed more effectively than others, and how this might affect photosynthesis.
Report your findings on your datasheet. Your introduction shouldexplain what photosynthetic pigments are, why plants have more thanone kind of photosynthetic pigment, and what the purpose of theexperiment is. Your results should include sentences saying what youset out to do, where the results are presented, and what your keyresults were. It should also include a table of Rf values and colorsfor each of the pigments detected in the 4 extracts. Your discussionshould include a tentative identification of the main pigments ineach extract, your reasoning, and some discussion of the differencesbetween the green and yellow leaves.
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The light-independent reactions use the NADPH and ATP generated bythe light reactions to incorporate CO2 into organic molecules andreduce these to form carbohydrates. This is done by means of a seriesof reactions called the Calvin or PCR (photosynthetic carbonreduction) cycle. The Calvin cycle can be split into 3 phases:CO2 fixation, reversing glycolysis, and regeneratingribulose 1,5-bisphosphate (RuBP). CO2 is fixed by an enzymecalled ribulose 1,5-bisphosphate carboxylase/oxygenase, orRubisco, for short. Rubisco adds CO2 to RuBP to form a 6carbon molecule which is rapidly converted to two molecules of3-phosphoglycerate (which are also intermediates in glycolysis).3-phosphoglycerate is next converted to 3-phosphoglyceraldehyde,which is either used for carbohydrate synthesis, or to regenerateRuBP via a fiendishly complex set of reactions.
Sometimes photosynthesis is limited by the concentration of carbon dioxide in the air. Even if there is plenty of light, a plant cannot photosynthesise if there is insufficient carbon dioxide.
Photosynthesis by carrot tissue cultures - ResearchGate
30/11/2017 · Photosynthesis by ca..
Photosynthesis and cellular ..
Photosynthesis by carrot tissue cultures | SpringerLink
The energy from these radiations is used by plants during photosynthesis for the production of glucose ..
Photosynthesis | Photosynthesis | Chloroplast
Study topic #8 (photosynthesis) flashcards. Play games, take quizzes, print and more with Easy Notecards.
Biology 2.3 Flashcards | Quizlet
Some plants and plantlike organisms have developed other pigments to compensate for low light or poor use of light. Cyanobacteria and red algae have phycocyanin and allophycocyanin as accessory pigments to absorbe orange light. They also have a red pigment called phycoerythrin that absorbs green light and extends the range of photosynthesis. The red pigment is found in vegetables. Some red algae are in fact nearly black, so that increases their photosynthetic efficiency. Brown algae have the pigment fucoxanthin in addition to chlorophyll to widen their absorption range. These red and brown algae grow to depths around 270 meters where the light is less than 1% of surface light.
PG 43 Photosynthesis and the Leaf A Becka Book 9.8.11 ..
however, the reactions by which this is accomplished arediabolically complex. Photosynthesis can be separated into two setsof reactions: the light reactions, which capture light and useits energy to make ATP and NADPH, and the light-independentreactions, which use the ATP and NADPH formed by the lightreactions to convert CO2 into carbohydrates. Both sets of reactionsoccur in the chloroplasts of higher plants; however, the lightreactions occur in the thylakoids, while the dark reactions occur inthe stroma. Photosynthesis is described in greater detail in chapter10 of your text and topic 7 of your lab manual.
What is chlorophyll and what is photosynthesis
Farmers can use their knowledge of these limiting factors to increase crop growth in greenhouses. They may use artificial light so that photosynthesis can continue beyond daylight hours, or in a higher-than-normal light intensity. The use of paraffin lamps inside a greenhouse increases the rate of photosynthesis because the burning paraffin produces carbon dioxide, and heat too.
lab 7 instructions - Wilkes University
Healthy plants convert light to energy via photosynthesis, but chlorophyll also emits a fraction of absorbed light as fluorescent glow that is invisible to the naked eye. The magnitude of the glow is an excellent indicator of the amount of photosynthesis, or gross productivity, of plants in a given region.
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