Page 122 - Science Course 1 (Book 1)

Mo4-L3a: Photosynthesis: How Do Plants Get Energy?

Photosynthesis

Photosynthesis is a series of chemical reactions that
convert light energy, water, and carbon dioxide into
the food-energy molecule glucose and give off
oxygen.

Two types of mesophyll cells inside a leaf contain Near the top surface of the leaf are palisade
chloroplasts, the organelles where photosynthesis mesophyll cells, which are packed together.
occurs.
Spongy mesophyll cells have open spaces
between them, and gases needed for photosynthesis
flow through the spaces.

In the first step of photosynthesis,
plants capture the energy in light.

This occurs in chloroplasts, which Chlorophyll
contain plant pigments.

Chlorophyll, the most common
plant pigment, is necessary for
photosynthesis.
Inner Membrane

Stroma

Granum
Thylakoid
Outer Membrane
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