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Chloroplast Model
Modèle de Chloroplaste, Granum et Thylakoid Matrix: Facilitates the visualization of the light-dependent reaction sites, assisting in the analysis of photophosphorylation pathways.
Modèle en 3D agrandi Detail-Oriented Stroma and DNA Representations: Enables advanced students to evaluate the chloroplast’s role in semi-autonomous replication and protein synthesis within plant cells.
$115.69
Quick Answer: The Chloroplast Model is an enlarged model of a chloroplast, the organelle in which photosynthesis takes place, opened to show its double membrane, the fluid stroma and the stacks of thylakoid discs called grana. It is used in biology lessons on plant cell structure and on the light-dependent and light-independent reactions.
Inside the Chloroplast
A chloroplast is a lens-shaped organelle found in the green cells of leaves and young stems. It is bounded by an envelope of two membranes. Inside is the stroma, a gel-like fluid, and suspended in it is a third membrane system: flattened sacs called thylakoids, stacked in places like piles of coins to form grana. Membranes called intergranal lamellae link one granum to the next. The stroma also holds starch grains, lipid droplets, ribosomes and a small circle of DNA. A chloroplast model shows these layers in three dimensions, which electron micrographs can only suggest.
The structure maps directly onto the chemistry of photosynthesis. The light-dependent reactions happen in the thylakoid membranes, where chlorophyll and other pigments in the photosystems absorb light, water is split to release oxygen, and the captured energy is used to make ATP and NADPH. Stacking the thylakoids into grana packs a large membrane area into a small space. The light-independent reactions, the Calvin cycle, happen in the stroma, where the enzyme rubisco fixes carbon dioxide and the ATP and NADPH are used to build sugars.
The listing does not state the magnification, whether the model is sectioned or separable, or its size, and its product image is not currently available. The DNA and ribosomes inside the chloroplast are also the basis of the endosymbiotic theory, which proposes that chloroplasts descend from free-living photosynthetic bacteria. For the organelle’s place in the whole cell, see the plant cell model, big.
Specifications
| Model of | Chloroplast, greatly enlarged and opened to show its interior |
| Membranes | Outer and inner envelope membranes, thylakoid membranes |
| Internal structures typically shown | Stroma, grana, intergranal lamellae, starch grains |
| Topics | Photosynthesis, plant cell ultrastructure, endosymbiosis |
| Magnification, parts and size | Confirm at enquiry |
Classroom Uses
- Locating the light-dependent and light-independent reactions of photosynthesis
- Interpreting electron micrographs of leaf cells
- Explaining the evidence for the endosymbiotic origin of chloroplasts
- Comparing chloroplasts with mitochondria in cell biology lessons
Care & Handling
- Hold the chloroplast model by its base or outer body, not by the stacked grana, which are its most delicate part.
- Dust with a soft brush; wet cleaning can seep between assembled layers.
- Store it covered and out of sunlight so the greens used for the thylakoids do not fade.
Why Choose LabEquip
Biology teachers preparing students for photosynthesis topics at secondary and pre-university level use a chloroplast model to show where each stage happens. LabEquip lists it among its biology lab products; for size and magnification, write via the contact page.
Frequently Asked Questions
What are grana and thylakoids?
Thylakoids are flattened membrane sacs inside the chloroplast that contain chlorophyll. A granum is a stack of thylakoids, and a chloroplast contains many grana linked by intergranal lamellae.
Where do the light-dependent reactions take place?
In the thylakoid membranes, where the photosystems absorb light. Water is split there, releasing oxygen, and the energy captured is used to make ATP and NADPH for the next stage.
What happens in the stroma?
The stroma is the site of the Calvin cycle, the light-independent reactions. Carbon dioxide is fixed by the enzyme rubisco, and ATP and NADPH from the thylakoids are used to make sugars.
Why do chloroplasts have their own DNA?
Chloroplasts are thought to descend from photosynthetic bacteria taken in by an early cell, the endosymbiotic theory. Their own circular DNA, bacterial-type ribosomes and double membrane support this idea.
How do chloroplasts differ from mitochondria?
Both have a double membrane and their own DNA and ribosomes. Chloroplasts capture light energy to build sugars and contain thylakoids, while mitochondria release energy from sugars in respiration and have folded inner membranes called cristae.
Which cells contain chloroplasts?
Mainly the palisade and spongy mesophyll cells of leaves, with fewer in guard cells and young green stems. Root cells and other cells that receive no light usually have none.
Last Updated: September 2026
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