Download Ch. 7: Cells are Busy Places: Converting Sunlight into Sugar

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Ch. 7: Cells are Busy Places: Converting Sunlight into Sugar
Describe Photosynthesis (in your own words).
Process that plants use to combine light, Carbon Dioxide & water to make food (glucose) + oxygen gas.
Happens in chloroplasts.
Read “Converting Sunlight into Sugar” (page 327) in your BSCS book.
1.
What do plants need to grow?
Water, sun, carbon dioxide and the FOOD the make!
2.
What is the food that plants make for themselves? Sugar or glucose
3. What is the process called that makes sugars? photosynthesis
Read “Energy” (page 327-329) in your BSCS book.
4. What is energy & what forms does it come in?
Capacity to do work. Chemical, light, electrical, mechanical
5.
In what form do organisms store their energy?
organic molecules
6. The energy inside of molecules found in food and gasoline is called chemical energy.
7. An important property of energy is that it cannot be created or destroyed, but it can be transferred
from one form to another.
What form of energy is the food you eat transferred into when you go hiking? Mechanical
8.
energy
9.
The food contains
chemical energy that is turned into
Mechanical energy.
10. What must plants do to use the Sun as an energy source?
Convert the sun’s light energy into chemical energy
11. What is the only type of radiant energy that plants use to do photosynthesis?
12.
In plants, what is the green pigment called that absorbs light?
SUN
chlorophyll
Stop & Think (p. 329)
1. The chemical energy gasoline is converted into mechanical energy to make a car move. Give
another example of energy being converted from one form to another.
AWV-maybe food energy to mechanical energy in bodies or electrical energy to light energy
in a lamp
2. Where do plants get their energy?
FROM THE SUN!
3. Explain why the following statement is incorrect: “Plants get their food from the soil.”
Plants don’t eat food like animals. Make their own food from photosynthesis. Soil doesn’t give ENERGY.
4. Using the spectrum figure 7.4. Imagine the discovery of a new desert plant that has a unique pigment
in its leaves called “azurephyll”. This pigment strongly absorbs all sunlight from green light (500 nm) to
red light (700nm). If you observed this plant in the desert, what color would the leaves appear to be?
Why? Blue/purple b/c the pigment wouldn’t absorb light in the blue part;; it would reflect
it instead.