Light Intensity And Photosynthesis
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The lesson plan outlines an experiment to investigate how light intensity affects the rate of photosynthesis. Students will measure the rate of bubble production in Elodea over a range of distances from a lamp to determine the relationship between light intensity and photosynthesis. In the first lesson, students will set up the experiment and collect initial data. The second lesson will involve collecting additional data and graphing the results to show how the rate of photosynthesis changes with light intensity. The goal is for students to understand that light energy drives photosynthesis and more intense light results in a higher rate.
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Photosynthesis And Cellular Respiration Notes New
1. Photosynthesis uses energy from sunlight, carbon dioxide, and water to produce glucose and oxygen through a two-phase process of light-dependent and light-independent reactions.
2. Cellular respiration breaks down glucose and other food molecules to produce ATP through three main stages: glycolysis, the citric acid cycle, and the electron transport chain.
3. Both processes are essential for life - photosynthesis provides energy for plants and produces oxygen and glucose as an energy source for cellular respiration in plants and animals.
How does the color of the light affect the growth of a plant
The student conducted an experiment to determine how the color of light affects plant growth. Two identical plants were placed under different light sources - one under a blue light bulb and one under a natural light bulb. Over several weeks, the student observed and recorded data on the plants' growth. Their results showed that the plant under the natural light grew healthier and stronger, developing leaves, flowers, and a greater height, while the plant under blue light struggled, failing to flower and growing much smaller with weak branches. The student concluded that natural light allows for optimal plant growth compared to artificial blue light.
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Zara found a plant with variegated leaves that had both green and white areas. She predicted the green parts would contain starch from photosynthesis, but the white parts would not. To test this, she used iodine solution on sections of the leaf. Iodine turns blue-black in the presence of starch. Her results supported her prediction, as the iodine turned blue-black on the green areas but not the white areas, showing the green parts had synthesized starch through photosynthesis while the white parts had not.
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Photosynthesis definition states that the process exclusively takes place in the chloroplasts through photosynthetic pigments such as chlorophyll a, chlorophyll b, carotene and xanthophyll. All green plants and a few other autotrophic organisms utilize photosynthesis to synthesize nutrients by using carbon dioxide, water and sunlight. The by-product of the photosynthesis process is oxygen.Let us have a detailed look at the process, reaction and importance of photosynthesis.
What Is Photosynthesis in Biology?
The word “photosynthesis” is derived from the Greek words phōs (pronounced: “fos”) and σύνθεσις (pronounced: “synthesis“)Phōs means “light” and σύνθεσις means, “combining together.” This means “combining together with the help of light.”
Photosynthesis also applies to other organisms besides green plants. These include several prokaryotes such as cyanobacteria, purple bacteria and green sulfur bacteria. These organisms exhibit photosynthesis just like green plantsThe glucose produced during photosynthesis is then used to fuel various cellular activities. The by-product of this physio-chemical process is oxygen.
Photosynthesis Reaction
A visual representation of the photosynthesis reaction
Photosynthesis is also used by algae to convert solar energy into chemical energy. Oxygen is liberated as a by-product and light is considered as a major factor to complete the process of photosynthesis.
Photosynthesis occurs when plants use light energy to convert carbon dioxide and water into glucose and oxygen. Leaves contain microscopic cellular organelles known as chloroplasts.
Each chloroplast contains a green-coloured pigment called chlorophyll. Light energy is absorbed by chlorophyll molecules whereas carbon dioxide and oxygen enter through the tiny pores of stomata located in the epidermis of leaves.
Another by-product of photosynthesis is sugars such as glucose and fructose.
These sugars are then sent to the roots, stems, leaves, fruits, flowers and seeds. In other words, these sugars are used by the plants as an energy source, which helps them to grow. These sugar molecules then combine with each other to form more complex carbohydrates like cellulose and starch. The cellulose is considered as the structural material that is used in plant cell walls.
Also Read: Photosynthesis in Higher plants
Where Does This Process Occur?
Chloroplasts are the sites of photosynthesis in plants and blue-green algae. All green parts of a plant, including the green stems, green leaves, and sepals – floral parts comprise of chloroplasts – green colour plastids. These cell organelles are present only in plant cells and are located within the mesophyll cells of leaves.
Factors Affecting Photosynthesis
Photosynthesis process requires several factors such as:
Light Intensity: Increased light intensity results in a higher rate of photosynthesis. On the other hand, low light intensity results in a lower rate of photosynthesis.
The concentration of CO2: Higher conce
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At an average temperature of 10°C, the optimum fur length for survival is 15mm, with individuals distributed around this length. If the temperature drops to 5°C, individuals with longer fur are better insulated and more likely to survive and reproduce, passing on genes for longer fur. Over generations, the mean fur length of the population increases as longer-furred individuals survive at a higher rate than shorter-furred individuals, until the optimum length is reached again.
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Pushing the limits of ePRTC: 100ns holdover for 100 days
Light Intensity And Photosynthesis
- 1. Lesson title: Light Intensity and Photosynthesis Class: 11a2 Date:23rd Nov Period: 3 No. Pupils: 16 Boys: 3 Girls:13 Lesson Objectives (WALT): Light energy is absorbed by chlorophyll in green plants and used to convert carbon dioxide and water to oxygen and glucose Time Activity Content / Notes (key points, questions to ask, assessment of learning, safety) Before Have all the equipment where needed. entry 11.14 Starter 6 Recall the factors which affect photosynthesis. If we want to vary light and mins see the effect what needs to be in good supply and how will we do this? 11.20 Main Outline the practical with discussion on variables, errors, validity etc. activity 1 Students to draw own results table which is then marked in class. Students 1.5 lessons need to add sodium bicarbonate to provide a ready supply of co2 to make sure this does not limit the rate. It’s also a good idea to get the students to practice setting up the experiment so they know exactly what to do next lesson. Lesson 2 – collect data and draw graph. Suggest move lamp back from 0 to about 70cm and count bubbles produced for a minute every 10cm with three repeats Plenary Discuss results and what this shows- due the graphs looked like they would mins expect. Extra work Risk Assessment Homework Vocabulary (key words) Links with previous lessons Builds on ideas about limiting factors Specification Links • Photosynthesis is summarised by the equation: carbon dioxide + water (+ light energy) = glucose + oxygen During photosynthesis: − light energy is absorbed by a green substance called chlorophyll which is found in chloroplasts in some plant cells this energy is used by converting carbon dioxide and waterinto sugar (glucose) − oxygen is released as a by-product. Equipment Elodea, Sodium bicarbonate, Spatulas, Paper clips, Boiling tubes, 250ml glass beakers Meter rules, Stopwatches, lamps, Graph paper