Mitochondria and Cellular Respiration
Because they are living cells need a constant supply of ENERGY.
To do this cells take in OXYGEN (O2) and FOOD/FUEL
(carbohydrates such as glucose) and combine them in a reaction
called CELLULAR RESPIRATION.
IMPORTANT
Glucose + Oxygen → Carbon dioxide + water + useable energy
C6H12O6 + 6O2
→ 6CO2 + 6H2O + useable energy
Cellular respiration takes place inside the
MITOCHONDRIA of the cell. ALL CELLS (plants &
animals) contain mitochondria which produce energy.
Cells in MUSCLE tissues may contain
several hundred mitochondria as they
use lots of energy!
Label the diagram below:
Outer membrane
Inner membrane
Matrix
Cristae
Chloroplasts & Photosynthesis
Plants are called PRODUCERS because they create FOOD
(glucose) from water, carbon dioxide, and sunlight in a reaction
called PHOTOSYNTHESIS. It is the OPPOSITE reaction of
cellular respiration.
IMPORTANT
chlorophyll
Carbon dioxide + water + light
→ Glucose + Oxygen
6CO2 + 6H2O + light
chlorophyll
→
C6H12O6 + 6O2
To do this, PLANT CELLS have special
organelles (components) called
CHLOROPLASTS. These structures contain a
GREEN pigment called CHLOROPHYLL which
makes the reaction happen! (It is not created
nor consumed in the reaction so we write it above the reaction
arrow.)
Almost all food chains on earth depend upon the
PHOTOSYNTHESIS reaction as it is the produced glucose that
supplies organisms with a food source to burn to create energy.
Examples:
Please Complete
Wheat → Flour → _______→ You
Grass → _______ → Steak → You
Write your own food chain:
Questions:
1. What are two products of cellular respiration?
2. What are two products of photosynthesis?
3. Some people say that plants need us and we need plants.
Explain this statement using the information you have learned.
4. What one word would best describe the above two processes?
5. Many plants have green leaves, but their stems, stalks, and
roots are not green. Why might this be? Make a hypothesis,
using an “I believe…” statement.