BIOA02H3 Chapter 8: chapter 8

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28 Apr 2011

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Document Summary

Life depends on absorption of light energy from sun not very efficient ~ 4% of light actually used. Pigments absorb light in visible spectrum (400 700nm: most common pigment in all photoautotrophs is chlorophyll plants, some algae an cyanobacteria havechlorophyll a. Absorbtion in blue (400-450 nm) and red (650-700 nm) Chlorophyll appears green because it reflects green wavelengths (500 to 600 nm) Accessory pigments include carotene, phycocyanin, phycoerythrin, xanthophylls have characteristic absorption spectra that reveals their biological effectiveness at different wavelengths of light. Chlorophyll molecule reaction center a special pigment molecule where energy from photons of light is concentrated act as antennae to maximize light absorption electrons pass down energy gradient from higher energy (shorter l energy (longer l. Electrons pass from one to another pigment molecule within photsystem. Light dependent reactions process responsible for aerobic oxygenic atmosphere occurs in photoautotrophic organisms.

Related Questions

Plants are net ____ consumers and _____ producers.

TRUE or FALSE: During photosynthesis, glucose is made during the light-independent (dark) reactions.

TRUE or FALSE: The products of photosynthesis are carbon dioxide and water.

What is the main product of photosynthesis?

What is the energy source for the process of photosynthesis?

In what organelle does photosynthesis occur?

TRUE or FALSE: All organismsâ lives depend of photosynthesis.

Animals are net ___ consumers and net ____producers.

What are discrete packets of kinetic energy in light?

Give two examples of accessory pigments for photosynthesis.

TRUE or FALSE: The primary photosynthetic pigment chlorophyll a.

What is the empirical formula for glucose?

During glycolysis, molecules of glucose are broken down into ___ molecules of _____.

Which comes first: glycolysis, kreb cycle, or electron transport chain?

Where in the cell does glycolysis occur?

Photosynthesis Lab Report

Plant Structure and Function

Through the process called __________ plants convert lightenergy into

__________ energy. Record your answerbelow.

In which structure of the plant does photosynthesis occur?

What is the difference between xylem and phloem?

Based on lab, Exercise 1, what is the name and function of thestructure labeled with the letter âHâ?

Chloroplast

Based on Lab, Exercise 2, draw and label each part of thechloroplast. Sign, date and prepare an image of your drawing andinclude it with this lab report.

What part of the process of photosynthesis occurs in thethylakoid compartment?

What is the name and function of the structure labeled with theletter âEâ in Exercise 2?

Photosynthetic Products

What are the three products of photosynthesis?

What happens to the glucose that is not metabolizedimmediately?

In the test for starch, which tube demonstrated a positive testfor starch? How do you know?

Based on Lab, Exercise 3 explain why part of the leaf was amberin color.

Light Absorption

What pigment is used by plants to absorb light?

In the video demonstration in Exercise 4 what happens to thelight spectrum when a green filter is placed in front of the lightsource?

In step 3 of Exercise 4, which color was not absorbed by thespinach pigments?

Photosynthetic Pigments

What process is used in Exercise 5 to separate the plantpigments?

Look at the chromatogram results in Exercise 5. What color isreflected by chlorophyll a?

Which pigment reflected an orange color?

VI. Effect of Light and Temperature onPhotosynthesis

What was the conclusion of Blackmanâs first experiment on theeffect of light on photosynthesis?

In his second experiment, what effect did increasingtemperature have on the rate of photosynthesis?

Record the data from Exercise 6 below.

Lamp Distance	Temperature	Ave Bubble/min
75 cm
50 cm
25 cm

In the experiment in Exercise 6, what conclusion can be drawnabout the effect of light and temperature on rate ofphotosynthesis?

Summary Questions

Why do heterotrophs depend on autotrophs?

Name two reactants necessary for photosynthesis to occur.

How would the process of photosynthesis be affected if a planthad no stomata?

What tool is used to separate white light into differentwavelengths of color?

Explain why we see the color green on the leaves ofplants.

What color is absorbed the least by the petals on asunflower?

Photosynthesis consists of two phases. Which phase would beleast affected by living in an area where there are shorter daysand long periods of darkness?

How could air pollution affect food production and the priceyou pay for food at the supermarket?

peachtoad655

Chlorophyll is a pigment that absorbs specific wavelengths of light, and the absorption of that light leads to the passage of electrons to a higher energy state, where chemical energy can then be harvested from them. You would expect that a plant exposed to which color of light would produce the most photosynthesis?

Which color of light would you expect chlorophyll to absorb the least?

Most plants are green because....

chlorophyll absorbs green light well

chlorophyll does not absorb green light well

chlorophyll reflects green light well

both of the last two answers are correct

Thinking about the gases involved in respiration and photosynthesis, during the day, a plant is producing____ from respiration and releasing_____ from photosynthesis. But at night, a plant is only producing_______ from respiration.(spell your answers out completely).

Plants perform cellular respiration to produce.......

Which of the following is true about plants and cellular respiration?

plants perform cellular respiration only during the night

plants perform cellular respiration only during the day

plants perform cellular respiration during the night and day

plants do not perform cellular respiration

Which of the following is true regarding plants and photosynthesis?

plants perform photosynthesis only during the night