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© James E. Mickle and Patty M. Aune 2002
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Photosynthesis and Respiration
Photosynthesis and Respiration
Objectives :
1. Describe the relationship between photosynthesis and respiration in energy flow.
2. Describe the process of anaerobic respiration.
3. Describe and discuss the process of photosynthesis.
4. Discuss the production, distribution and use of starch in leaves.
Before Lab : Read Sections 2.15, 5.21, 6.1 - 6.5, 6.8 and 7 (introduction) - 7.11 in Campbell et al.,
Biology, Connections and Concepts , 2
nd
, 3
rd
or 4
th
ed. or 5.21, 6.1 – 6.8, 6.13 and 7
(introduction) - 7.11 in the 5
th
ed. or Sections 2.15, 6 (introduction) – 6.6, 6.13 and 7
(Introduction) -7.6 in the 6
th
ed.
Turn in : This entire completed lab unit, including all tables, graphs, and questions. Two
photographs are required from this lab.
Introduction
"I just don't have the energy!" is a common cry. Is this really true? And just how do you get "the
energy." From a fatigue/psychology standpoint, it is difficult to say, but from a biological
viewpoint, the answer is by photosynthesis and respiration. Green plants are autotrophs, and as
such can undergo photosynthesis to use light energy to convert inorganic materials from the air
and soil into organic compounds. In a very real sense, plants are made "from thin air!"
The organic compounds made by plants contain chemical energy. This chemical energy is
utilized, through respiration, to do all of the work to keep the organism (and all of its cells) alive.
The relationship of photosynthesis and respiration for all living organisms can be summarized as
follows:
Light energy from the sun->
->plants make organic compounds(via photosynthesis)->
->plants and animals use the organic compounds as energy sources
(via respiration)->
->energy used for work and/or lost as heat
This relationship reflects energy flow in a food chain as well as the molecular flow of making and
using energy-rich organic compounds. In this laboratory unit, we will be looking at these two
basic processes: photosynthesis and respiration.
Photosynthesis
Plants require the same substances that you do to stay alive--organic foods, minerals, water, and
oxygen. You, however, cannot make your own organic foods. You consume these substances
before you are able to benefit from the energy they contain (via digestions and respiration). While
plants can make their own food via photosynthesis , they too must undergo respiration to utilize
the energy in these energy rich organic compounds.

BIO 106 Distance Lab 2 Photosynthesis/Respiration
Photosynthesis is the process by which plants make organic compounds (sugars) using inorganic
carbon dioxide (from the atmosphere) and water (from the soil) as raw materials and light as an
energy source. Plants obtain mineral nutrients from the soil. These substances, along with
water, are transported from the roots to the photosynthetic tissue in leaves and stems via the
vascular tissue called xylem .