LAB TEST: PHOTOSYNTHESIS Questions
When something appears blue, it is absorbing all colors except
Blue Plants reflect back green and some yellow wavelengths of light that chlorophyll pigments cannot absorb and convert, therefore if an object appears blue it is because the object is reflecting blue wavelengths of light.
Which of the following statements about chlorophyll is correct? It appears green because it absorbs light in the green light spectrum. All of the choices are correct. It reflects all colors in the light spectrum except green. It reflects high-energy electrons. It reflects light in the green light spectrum.
It reflects light in the green light spectrum.Chlorophyll is a plant pigment that absorb specific wavelengths of light energy and reflect back the green wavelengths of light that chlorophyll pigments cannot absorb.
In paper chromatography, photosynthetic pigments from a plant pigment extract will separate due to their (Check all that apply)
Pigments responsible for photosynthesis can be separated based on their chemical composition on chromatography paper. Molecules that are soluble in the transport solution will move up the chromatography paper more quickly than the molecules that are attracted to the paper.
Chlorophyll is the main pigment found in plants. Other pigments are also present. If these other pigments were lost from a plant, but chlorophyll remained, what effect would this have on the plant?
The plant would no longer be able to absorb wavelengths of light distinct from the ones absorbed by chlorophyll.
Which best explains the role of plant pigments in photosynthesis?
absorbs light energy
A student set up an experiment to show that carbon dioxide is consumed by Elodea plants during photosynthesis. She filled two test tubes with distilled water and placed a piece of Elodea in each of the tubes. She added a drop of phenol red, which turns red in a basic solution and yellow in an acidic solution. She blew in each tube to add carbon dioxide, which caused the distilled water to become more acidic so the phenol red turned yellow. She wrapped Tube A in aluminum foil and left Tube B exposed to the light. What is the dependent variable in this experiment?
change in pH The variable being controlled in the experiment is the independent variable (light or no light). The change being seen is the dependent variable. The dependent variable is the change in the solutions pH.
The primary photosynthetic pigment is
chlorophyll
The organelle where photosynthesis occurs is the
chloroplast.
The specialized organelles that carry out photosynthesis are called
chloroplasts. The photosynthesis reaction takes place in the plants leaves and green stems inside the chloroplast organelle.
The light that is absorbed by a green plant leaf is
from the red and violet portion of the electromagnetic spectrum.
Different photosynthetic pigments from a plant pigment extract can be separated by
paper chromatography. Pigments responsible for photosynthesis can be separated based on their chemical composition on chromatography paper.
The color of a photopigment is due to
the color of light that it reflects.
In the white light experiment, in which elodea leaves and sodium bicarbonate were added to tubes, the net rate of photosynthesis was determined by volume changes in volumeters due to
the volume of CO2 produced during respiration.the volume of CO2 produced during respiration. Correct the amount of sodium bicarbonate used. Plant cells have both mitochondria and chloroplasts so in order to determine the net rate of photosynthesis, you would have to measure the amount of oxygen created during photosynthesis and the amount of oxygen used during cellular respiration.
The oxygen produced by a plant comes most directly from
H2O Water is split into hydrogen and oxygen. The hydrogen is used in the first part of photosynthesis (light dependent reactions) to drive the creation of ATP used in the Calvin cycle. The oxygen is released by the plant or used to create ATP during cellular respiration.
All of the following are required for the Calvin cycle except CO2. H2O. ATP. NADPH. rubisco.
H2O.In the Calvin cycle (light independent reaction), carbon dioxide is converted into carbohydrates with the help of ATP, NADPH and an enzyme called rubisco. Water was used in the first part of photosynthesis (light dependent reactions) to drive the creation of ATP used in the Calvin cycle.
If a solution is undergoing a reaction where CO2 is being used as a reactant, what color is the phenol red-containing solution shifting toward?
red
What is the main role of the pigment molecules?
Absorb photons and transfer light energy to the reaction center chlorophyll.
carotene xanthophyll chlorophyll a chlorophyll b
Chlorophyll a (absorbs red-violet light, appears blue-green), chlorophyll b (absorbs red-violet light, appears yellow-green), carotenes (absorb blue-violet light, appear orange), and xanthophylls (absorb blue light, appear yellow)
The molecule that traps the sun's energy is
Chlorophyll pigments are protein molecules imbedded in the chloroplast the thylakoid membrane.
A student set up a test tube containing sodium bicarbonate and topped it with a volumeter, but forgot to add the Elodea plant! Which of the statements below gives the result that the student would be likely to observe? Multiple Choice
The level of the liquid in the volumeter would remain constant since gas is neither being produced nor being used. Normally we would see the displacement of the liquid due to the rise in oxygen caused by photosynthesis if the plant was placed in the tube.
What would you expect to happen if you compare the rate of photosynthesis in bright white light and in darkness?
The rate of photosynthesis will be greater in bright white light than in darkness. Since photosynthesis requires light to proceed, the rate of photosynthesis would increase when exposed to white light compared to darkness.
A student set up an experiment to show the effect of light color on photosynthesis in Elodea plants. She filled three test tubes with distilled water and placed a piece of Elodea in each of the tubes. She added a drop of phenol red, which turns red in a basic solution and yellow in an acidic solution. She blew in each tube to add carbon dioxide, which caused the distilled water to become more acidic so the phenol red turned yellow. She exposed Tube A to white light, Tube B to green light, and Tube C was wrapped in aluminum foil. Which of the tubes should she expect to turn red the fastest?
Tube A Tube C is in the dark and the rate of photosynthesis is decreased. The solution will not lose CO2, therefore it will stay yellow. Tube A is exposed to white light and the rate of photosynthesis is increased. The solution will lose CO2, therefore it will change to red. Tube B is exposed to green light and the rate of photosynthesis is minimal. The solution will lose CO2, therefore it will change to red but much more slowly than tube A.
A student set up an experiment to show that carbon dioxide is consumed by Elodea plants during photosynthesis. She filled two test tubes with distilled water and placed a piece of Elodea in each of the tubes. She added a drop of phenol red, which turns red in a basic solution and yellow in an acidic solution. She blew in each tube to add carbon dioxide, which caused the distilled water to become more acidic so the phenol red turned yellow. She wrapped Tube A in aluminum foil and left Tube B exposed to the light. After 15 minutes, what should she expect to observe?
Tube A will be yellow and Tube B will be red.
Why would you not use green light and white light if you wanted to determine the dependence of specific color wavelengths on the rate of photosynthesis?
White light contains all visible wavelengths, not just one color. White light contains all visible wavelengths of light (ROYGBIV). You would not be comparing one specific color against the green, you would be comparing all colors against the green.
Photosynthesis is
divided into two major steps, light dependent reactions and light independent reactions. Water was used in the first part of photosynthesis (light dependent reactions) to drive the creation of ATP used in the Calvin cycle. In the Calvin cycle (light independent reaction), carbon dioxide is converted into carbohydrates with the help of ATP, NADPH, and an enzyme called rubisco.
Chlorophyll A and Chlorophyll B are
photosynthetic pigments. Chlorophyll a (absorbs red-violet light, appears blue-green), chlorophyll b (absorbs red-violet light, appears yellow-green), are the main pigments responsible for photosynthesis.
Molecules that absorb light energy are called
pigments. Chlorophyll is a plant pigment that absorb specific wavelengths of light energy and convert into chemical energy.
The full range of energy (seen and unseen) in sunlight can best be described as
the electromagnetic spectrum. The full range of light, electromagnetic spectrum includes visible light (ROYGBIV) and ultraviolet light (we use UV protection sunscreen to block these rays).
Which way do the chlorophyll bands move on the chromatography paper?
up the chromatography paper Chloroplast extract is placed at the end of chromatography paper and the end is placed in a solvent. The solvent carries the molecules as it migrates up the paper. In this way, the molecules are separated.
Among the different forms of electromagnetic radiation emitted by the sun, which form is absorbed by plants for photosynthesis?
visible light Plant pigments absorb visible light energy and convert this energy into chemical energy.
Most atmospheric oxygen comes from photosynthesis. From which of the following molecules is the oxygen derived?
water Water is split into hydrogen and oxygen. The hydrogen is used in the first part of photosynthesis (light dependent reactions) to drive the creation of ATP used in the Calvin cycle. The oxygen is released by the plant or used to create ATP during cellular respiration.
If a solution is undergoing a reaction where CO2 is being created as a product, what color is the phenol red-containing solution shifting toward?
yellow
How does a phenol red-containing solution look if CO2 level is high?
yellow Phenol red solution is red if carbon dioxide levels are low (alkaline pH). Phenol red solution is yellow if the carbon dioxide level is high (acidic pH).
