appreciate the role of chloroplast in cell
Answers
Answer:
Plant chloroplasts are commonly found in guard cells located in plant leaves. Guard cells surround tiny pores called stomata, opening and closing them to allow for gas exchange required for photosynthesis. Chloroplasts and other plastids develop from cells called proplastids. Proplastids are immature, undifferentiated cells that develop into different types of plastids. A proplastid that develops into a chloroplast only does so in the presence of light. Chloroplasts contain several different structures, each having specialized functions.
Chloroplast structures include:
Membrane Envelope: contains inner and outer lipid bilayer membranes that act as protective coverings and keep chloroplast structures enclosed. The inner membrane separates the stroma from the intermembrane space and regulates the passage of molecules into and out of the chloroplast.
Intermembrane Space: space between the outer membrane and inner membrane.
Thylakoid System: internal membrane system consisting of flattened sac-like membrane structures called thylakoids that serve as the sites of conversion of light energy to chemical energy.
Thylakoid Lumen: compartment within each thylakoid.
Grana (singular granum): densely layered stacks of thylakoid sacs (10 to 20) that serve as the sites of conversion of light energy to chemical energy.
Stroma: dense fluid within the chloroplast that lies inside the envelope but outside the thylakoid membrane. This is the site of conversion of carbon dioxide to carbohydrates (sugar).
Chlorophyll: a green photosynthetic pigment within the chloroplast grana that absorbs light energy.
A chloroplast is also known as plastids.Plastids stored and harvesting needed substances for energy production.A chloroplast contain green pigment called chlorophyll which absorbs lights energy for photosynthesis.