Photosynthesis and light intensity

Generate hypotheses about rates of photosynthesis in response to increasing light intensity about four plant species.

Photosynthesis and light intensity

Chloroplast and Thylakoid In photosynthetic bacteria, the proteins that gather light for photosynthesis are embedded in cell membranes.

In its simplest form, this involves the membrane surrounding the cell itself.

Photosynthesis and light intensity

A typical plant cell contains about 10 to chloroplasts. The chloroplast is enclosed by a membrane. This membrane is composed of a phospholipid inner membrane, a phospholipid outer membrane, and an intermembrane space.

Enclosed by the membrane is an aqueous fluid called the stroma. Embedded within the stroma are stacks of thylakoids granawhich are the site of photosynthesis. The thylakoids appear as flattened disks.

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The thylakoid itself is enclosed by the thylakoid membrane, and within the enclosed volume is Photosynthesis and light intensity lumen or thylakoid space. Embedded in the thylakoid membrane are integral and peripheral membrane protein complexes of the photosynthetic system.

Plants absorb light primarily using the pigment chlorophyll. The green part of the light spectrum is not absorbed but is reflected which is the reason that most plants have a green color.

Besides chlorophyll, plants also use pigments such as carotenes and xanthophylls. These pigments are embedded in plants and algae in complexes called antenna proteins. In such proteins, the pigments are arranged to work together. Such a combination of proteins is also called a light-harvesting complex.

Although all cells in the green parts of a plant have chloroplasts, the majority of those are found in specially adapted structures called leaves.

Certain species adapted to conditions of strong sunlight and ariditysuch as many Euphorbia and cactus species, have their main photosynthetic organs in their stems.

Photosynthesis and light intensity

The cells in the interior tissues of a leaf, called the mesophyllcan contain betweenandchloroplasts for every square millimeter of leaf. The surface of the leaf is coated with a water-resistant waxy cuticle that protects the leaf from excessive evaporation of water and decreases the absorption of ultraviolet or blue light to reduce heating.

The transparent epidermis layer allows light to pass through to the palisade mesophyll cells where most of the photosynthesis takes place.

Light-dependent reactions Main article: Light-dependent reactions In the light-dependent reactionsone molecule of the pigment chlorophyll absorbs one photon and loses one electron. This electron is passed to a modified form of chlorophyll called pheophytinwhich passes the electron to a quinone molecule, starting the flow of electrons down an electron transport chain that leads to the ultimate reduction of NADP to NADPH.

What is Light Intensity? - Definition from MaximumYield

In addition, this creates a proton gradient energy gradient across the chloroplast membranewhich is used by ATP synthase in the synthesis of ATP. The chlorophyll molecule ultimately regains the electron it lost when a water molecule is split in a process called photolysiswhich releases a dioxygen O2 molecule as a waste product.

The overall equation for the light-dependent reactions under the conditions of non-cyclic electron flow in green plants is: The photosynthetic action spectrum depends on the type of accessory pigments present.

For example, in green plants, the action spectrum resembles the absorption spectrum for chlorophylls and carotenoids with absorption peaks in violet-blue and red light.Part I.

BBC Bitesize - GCSE Combined Science - Photosynthesis - AQA - Revision 2

Light intensity and Photosynthesis Experimental Procedure A. Respiration rate measurement. (Plant samples ought to be in the dark respiring until a steady state is reached before recording respiration.) 1. The respiration chamber system should be turned on, attached to a computer and.

LAB REPORT: PHOTOSYNTHESIS AND LIGHT Michael Tekin Lab section: 02A, Tuesday 21, – Relationships between CO 2 Assimilation and Light Intensity Figure 1. CO 2 assimilation of parade roses was measured at different light intensities.

The equation of the trend. Plants, on the other hand, are experts at capturing light energy and using it to make sugars through a process called photosynthesis.

This process begins with the absorption of light by specialized organic molecules, called pigments, that are found in the chloroplasts of plant cells.

Light Reactions of Photosynthesis Laboratory 7. 1 Laboratory 7: The characteristic feature of photosynthesis is the use of two light reactions in series to drive electrons from water to NADP+, up the spectrum, however, has its maximum intensity in the middle of the visible spectrum, near nm (yellow light).

Chlorophyll does not. // Provide alternate content for browsers that do not support scripting // or for those that have scripting disabled. This virtual experiments require Adobe Flash. Biology Coursework ÐŽV Does The Light Intensity Affect the Rate of Photosynthesis The Investigation In this experiment I will investigate the affect in which the light intensity will have on a plants photosynthesis process.

Photosynthesis Virtual Lab