bio

Bio 105: Ch 4 Photosynthesis Worksheet

1. Write the overall reaction of photosynthesis. Label the reactants and products.

2. Draw a picture of a chloroplast. Label the thylakoid, grana, and stroma.

3. Place the words into the diagram.

4. Pigment molecules in chloroplasts absorb light from the visible region of the electromagnetic spectrum.

Visible light

Violet

Blue

Green Yellow

Orange

Red

380 400 500 600 700 750

Wavelength (nm)

a. What color is light that has a wavelength of 700 nm?

b. If a light bulb is emitting a yellow colored light, what is the wavelength of the light?

c. Chlorophyll is a pigment that absorbs red and blue light. Plants containing a lot of chlorophyll are green-colored. Explain why plants with chlorophyll are green.

5. The main purpose of the light reactions of photosynthesis is to capture energy from and store it in molecules and

. The energy is captured using an “antenna” called a . Light reactions take place in the of the chloroplast.

6. The main purpose of the Calvin cycle of photosynthesis is to make sugar out of . This requires two products from the light reactions:

and . The Calvin cycle takes place in the _ of the chloroplast.