Overview Of Photosynthesis Worksheet
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1
2Overview of Photosynthesis
The Sites of Photosynthesis
Leaves are a plant's main ______________________ organs. Leaf structure is closely associated with its
photosynthetic function. Leaves must permit _____________________ access to the photosynthetic cells, but
impede ____________ from diffusing out. The ________________ that is a waste product of photosynthesis must be
allowed to escape from the leaf.
The ______________ cells in leaves are specialized for photosynthesis. These cells contain many ________________,
the organelles that perform photosynthesis.
Chloroplasts are the sites of photosynthesis. These double-______________ bound organelles enclose additional
membranes called ________________. The disc-shaped thylakoids possess an interior space. The ________________
are stacked to form _____________, which are suspended in the ____________ of the chloroplasts.
Overview of Photosynthesis
Photosynthesis converts __________________ to the __________________ of sugars and other organic compounds.
This process consists of a series of chemical reactions that require ___________________ and ___________________
and store chemical energy in the form of ________________. Light energy drives the reactions. _________________
is a by-product of photosynthesis and is released into the atmosphere. The following equation summarizes
photosynthesis:
6_______ + 6_______ --> __________ + 6_______
Photosynthesis transfers ____________ from water to energy-poor CO
molecules, forming energy-rich sugar
2
molecules (C
H
O
). This electron transfer is an example of an __________________________ process: the water is
6
12
6
oxidized (loses electrons) and the CO
is reduced (gains electrons). Photosynthesis uses light energy to drive the
2
electrons from water to their more energetic states in the sugar products, thus converting __________________ to
__________________.
In plants, photosynthesis occurs in chloroplasts, mainly in leaf cells. The ________________________ occur along
the ______________ membranes within the chloroplasts, where pigments capture light energy. The sugar-making
reactions of the ____________________ occur in the _____________, the fluid between the inner membrane of the
chloroplast and the thylakoids.
In the light reactions, light is absorbed by __________________ molecules, exciting their electrons. The energy of
+
excited electrons is then used to join ADP and phosphate to form ________. NADP
joins with excited electrons to
form __________, which temporarily stores the energized electrons. In the process, ____________ is split and
____________ is released.
In the Calvin cycle, energy from ________, electrons from ___________, and _____________ from carbon dioxide
are combined to produce sugar molecules.
Light Energy and Pigments
Sunlight is a type of energy called _____________, or electromagnetic energy. Electromagnetic energy travels
through space in a manner similar to the motion of waves in water. The distance between the crests of two
adjacent waves is called a ________________. The full range of electromagnetic wavelengths is known as the
______________________ spectrum. What we call visible light--the wavelengths that our eyes see as different
colors--is only a small fraction of the spectrum. The light reactions of photosynthesis use only certain wavelengths,
or colors, of visible light.
The thylakoid membrane in chloroplasts contains light-absorbing molecules called _______________. Different
pigments absorb light of different wavelengths. One pigment, ____________________, absorbs mainly blue-violet
and red light. This molecule participates directly in the light reactions. Another molecule, _____________________,
absorbs mainly blue and orange light. We do not see these absorbed colors when we look at a leaf. Instead, we see
the green wavelengths that are _________________ back from the leaf or _________________ through it.
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