Download Photosynthesis

Biology 102
Name _______________________ No. ___
Date _______________ Class ____
http://www.worsleyschool.net/science/files/photosynthesis/page.html
At the bottom of every food chain are____________, organisms that make food from ingredients
available in their environment. __________ are a good example, they make their food from _________.
Here are some words you need to be familiar with:
Photosynthesis- process where plants use __________________________to produce food and oxygen.
Respiration - process where cells use their ________ to release____________________.
Let’s examine these processes in detail, & relate them to the cell parts responsible for each function.
An individual cell is a small component from which living tissue is made, and there are many kinds of
cells, each containing parts within them that perform various functions.
Plant cells contain________________. These little 'factories' within the plant cells use the compound
_________________ to take the energy from _____________, and combine it with ______________
and__________... to produce ________ and ____________ (a form of sugar).
The chemical equation describing this reaction, photosynthesis, could be written this way:
6CO2 + 6H2O + energy --> 6O2 + C6H12O6
In each individual reaction, the chloroplast needs _______ molecules and _______ molecules, and
also_______________. From these it can manufacture, by breaking down the molecules and
rearranging the individual atoms, exactly 6 O2 molecules and 1 glucose molecule (C6H12O6).
Notice that the glucose molecule is large, containing a total of 24 atoms. It takes _________ to create
this big molecule, and this energy remains stored in the molecule until it is released in ____________.
Other 'factories' in the cell make use of glucose molecules; these organelles are the _______________.
Each mitochondrion takes glucose, breaks it down into atoms, and mixes it with more oxygen atoms to
produce,_______________________... energy in a form that can be used by all cells.
The chemical equation describing this reaction, cellular respiration, can be written this way:
6O2 + C6H12O6 --> 6H2O + 6CO2 + energy
In each individual reaction, the mitochondrion needs 6 O2 molecules and 1 glucose (C6H12O6)
molecule. From these, using energy stored in the bonds of the glucose molecule, it can produce
6 CO2 molecules, 6 H2O molecules, and a new form of energy.
This energy is stored by building a molecule called ______, or adenosine
triphosphate, in which the covalent bonds between atoms (the
. phosphate parts of the molecule) store a lot of ____________.
The other products of respiration, ________________, can be reused during photosynthesis. The ATP is
sent out to other cells in the organism to provide them with _____________. The tissues of plants contain
organic compounds, which contain some of the ATP the plant has made. The plant then becomes a
source of energy for other organisms, _______________, like insects or cows, which eat the plants.
Photosynthesis
This chapter will deal with photosynthesis: the series of chemical reactions in plants and other organisms that use
carbon dioxide to form food (carbohydrates).
A) Web URL: http://web.fscj.edu/David.Byres/photosyn.html
Read the section on Photosynthesis
1) What does “photo synthesis” literally mean ? ____________________________________________________
________________________________________________________________________________________
2) In which country was Van Helmont born? _______________________________________________________
3) What did Van Helmont’s experiment show about plants ? __________________________________________
________________________________________________________________________________________
4) In 1766 Joseph Priestley had a meeting with ____________________________________________________
5) How did Joseph Priestley find that plants produce oxygen ? ________________________________________
________________________________________________________________________________________
_________________________________________________________________________________________
6) What type of drink did Priestley invent? ________________________________________________________
7) What did Jan Ingenhousz discover about photosynthesis? _________________________________________
_______________________________________________________________________________________
8) What two colors of light are most effective in photosynthesis?__________ and _________
B) Web site name: University of Illinois : The virtual cell Web URL: http://www.life.uiuc.edu/plantbio/cell/
Read the section “Plant Cell” then return to the top of the page, select “Zoom”, in the “Search” area click
on the down arrow and select “chloroplast”. Then click on the diagram of the cell. When you see the
green chloroplast, select “Cut” then click again on the chloroplast. You can click several times on it to
gradually zoom in. Remember to read the information under the diagram every time you see a new view.
9) What is the “grana”? ______________________________________________________________________
10) What is the “stroma”______________________________________________________________________
When you get to a high magnification, click on “Function” (under the Zoom button) then click on the diagram once
more to see light being absorbed by the chloroplast.
C. Web site name: Arizona State University Web URL:http://photoscience.la.asu.edu/photosyn/study.html
Read “Why study photosynthesis”
11) What three examples of stored energy come from photosynthesis?
______________________________________________________________________________________
12) What does a plant use carbohydrates for? _____________________________________________________
13) What country uses ethanol as a major automobile fuel? ___________________________________________
14) What is the connection between plastics and photosynthesis? ______________________________________
______________________________________________________________________________________
15) How does photosynthesis counteract the effect of combustion of fossil fuels? __________________________
_______________________________________________________________________________________
16) List one more reason that photosynthesis is important: ___________________________________________
______________________________________________________________________________________
http://ftexploring.com/photosyn/photosynth.html
Read this page and summarize the process of photosynthesis in the space below.
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On the same page, click the link “Photosynthesis Basics” (top left side). Read the page and
summarize the process of cellular respiration.
__________________________________________
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Why Do Leaves Change Color in the Fall?
http://www.sciencemadesimple.com/leaves.html
We all enjoy the colors of autumn leaves. Did you ever wonder how and why a fall leaf changes color?
Why a maple leaf turns bright red? Where do the yellows and oranges come from? To answer those
questions, we first have to understand what leaves are and what they do.
Leaves are nature's _________________. Plants take _________ from the ground through their roots.
They take a gas, ___________________ from the air. Plants use ____________ to turn H 2o and
CO2 into__________. Glucose is a kind of sugar. Plants use glucose as food for ___________ and as
a building block for growing. The way plants turn water and carbon dioxide into sugar is called
____________________. That means "_________________________." A chemical called ________
helps make photosynthesis happen. Chlorophyll is what gives plants their___________________.
As summer ends and autumn comes, the days get shorter and shorter. This is how the trees "know" to
begin getting ready for winter.
During winter, there is not enough _________ or _________ for
photosynthesis. The trees will rest, and live off the food they stored
during the summer. They begin to shut down their food-making
factories. The green ______________ disappears from the leaves.
As the bright green fades away, we begin to see ________ and
_________ colors. Small amounts of these colors have been in the
leaves all along. We just can't see them in the summer, because
_____________________________________________.
The bright reds and purples we see in leaves are made mostly in the fall. In some trees, like maples,
__________ is trapped in the leaves after photosynthesis stops. Sunlight and the cool nights of autumn
cause the leaves turn this glucose into a _____ color. The brown color of trees like oaks is made from
wastes left in the leaves.
It is the combination of all these things that make the beautiful colors we enjoy in the fall.