12 Questions
What is the primary function of the granum in chloroplasts?
Trap sunlight to energize the food-making process
Which part of the chloroplast is responsible for converting carbon dioxide into sugar?
Stroma
What role does sunlight play in photosynthesis?
Provides energy for the food-making process
If a plant lacks chlorophyll, what is the most likely consequence?
Inability to trap sunlight for photosynthesis
Where do plants absorb water from for photosynthesis?
Roots
How does chloroplast convert sunlight into plant power?
By absorbing specific wavelengths of sunlight with chlorophyll
Which part of the leaf absorbs carbon dioxide during photosynthesis?
Stomata
What is the main purpose of the Light-Dependent Reaction in photosynthesis?
Generate ATP energy molecules
What is the role of xylem in plants' internal highway system?
Absorb water and minerals from roots to transport to leaves
During photosynthesis, what is the primary function of the Calvin Cycle?
Use energy from ATP to fix carbon dioxide into glucose
In testing a leaf for starch, what does a blue-black color change indicate?
Presence of starch
What is the major by-product of photosynthesis that is released into the atmosphere?
Oxygen gas
Study Notes
Photosynthesis: Powering Life on Earth
- Plants create their own food through photosynthesis, using sunlight, water, and air.
- Chloroplasts, tiny green factories inside plant cells, are responsible for photosynthesis.
The Photosynthesis Powerhouse: Chloroplasts
- Chloroplasts have two key parts:
- Granum: stacked sacs containing chlorophyll (green pigment) that trap sunlight to energize food production.
- Stroma: colorless gel where energy from sunlight is used to convert CO2 into sugar (food for plants).
Sunlight: The Fuel
- Sunlight provides energy for photosynthesis through chlorophyll.
- Chlorophyll absorbs specific wavelengths of sunlight, converting it into plant energy.
Ingredients for Plant Food
- Plants use simple ingredients:
- Water: absorbed from the soil through roots.
- Carbon dioxide: taken in from the air through stomata on leaves.
Mechanisms of Photosynthesis
- Photosynthesis has two stages:
- Light-Dependent Reaction (Light Reaction): occurs in granum, where chlorophyll absorbs sunlight, releasing electrons and producing ATP.
- Calvin Cycle (Carbon-Fixing Factory): uses energy from ATP to fix CO2 into organic molecules like glucose (plant food).
Testing for Starch
- Iodine solution can be used to detect starch in leaves, bread, or potatoes.
- A blue-black color indicates the presence of starch.
Importance of Photosynthesis
- Photosynthesis has a domino effect on life on Earth:
- Food source for all living things, directly or indirectly.
- Releases oxygen as a by-product, essential for animal respiration.
- Helps regulate Earth's temperature by absorbing CO2 during photosynthesis.
Plant Highway System
- Plants have an internal transportation system:
- Xylem: transports water and minerals from roots to leaves.
- Phloem: transports food produced in leaves to other plant parts like roots, stems, fruits, and flowers.
Learn about the light-dependent reactions of photosynthesis, where sunlight is converted into energy for the production of ATP. Understand the role of chlorophyll and the mechanisms involved in this crucial step of photosynthesis.
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