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Six facts about chloroplasts

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  • They have a double membrane around them.

  • The space inside is called the stroma. The space may contain starch grains and lipid bodies.

  • The thylakoids are stacked to form structures called grana.
Some plants can take in carbon dioxide and use light energy to convert it to carbohydrates. This green pigment uses light energy to split water as the first part of photosynthesis. Secondary pigments harvest wavelengths of light that chlorophyll is unable to absorb.