Domain: Healthcare — Medicine
Target concept: Morphological Observation of Microcapsules

Video generation prompt: Take a small amount of vitamin C microcapsules and place them on a slide. Add one drop of distilled water, cover with a coverslip, and observe the morphology of the microcapsules under a microscope.

Evaluation guide:
(i) Target concept: Visual confirmation of intact microcapsule morphology in aqueous suspension via light microscopy.
Minimum mechanism: Microcapsules must remain physically discrete and spherical when hydrated, implying a stable, non-porous, water-insoluble shell matrix that resists osmotic swelling or disintegration.
(ii)Storyline: [Frame 0–2] Static shot of clean glass slide → [Frame 3–4] Hand deposits dry microcapsules (visible as fine granular powder resolving into distinct spheres) → [Frame 5–6] Pipette delivers single distilled water droplet that beads up and partially wets microcapsules → [Frame 7–8] Coverslip lowers vertically, contacting water surface, flattening droplet into thin film without air bubbles → [Frame 9–10] Seamless cut or focus transition to microscope eyepiece view showing magnified field with spherical microcapsules evenly distributed and optically isolated in aqueous medium; all transitions preserve fixed lab-table viewpoint and consistent top-down illumination.

Manual:
Experimental Procedure
1. Place a small amount of vitamin C microcapsules onto a clean glass slide.
2. Add one drop of distilled water directly onto the microcapsules.
3. Gently lower a coverslip to cover the water droplet.
4. Observe under microscope at 100× magnification.
Observation of Experimental Phenomena
Microcapsules appear as discrete, spherical, non-adherent particles suspended in water; no dissolution, swelling, or aggregation occurs; edges are smooth and sharply defined.
Summary of Experimental Principles
Vitamin C microcapsules are typically composed of polymer shells (e.g., gelatin or chitosan) encapsulating ascorbic acid; their morphological integrity in aqueous medium confirms shell stability and successful microencapsulation.

Prompt Grounding rubric:
level_1: None of the five setup elements for this procedure (the vitamin C microcapsules, the glass slide, the distilled water droplet, the coverslip, and the microscope field-of-view) is ever shown; the video contains no slide-based sample preparation and no magnified view at any point.
level_2: At least one of the five setup elements is missing entirely, or the elements shown appear out of the specified order (microcapsules placed on slide → water droplet added → coverslip lowered → microscope view), for example the coverslip is already seated before any water droplet appears, the microscope view appears before the coverslip is placed, or only two or three of the five elements are shown at all.
level_3: All five setup elements appear and follow the correct order (microcapsules on slide → water added → coverslip lowered → microscope view), but at least one element is visually misidentified: for example the microcapsules are rendered as a fine white crystalline powder or table-salt-like granules rather than as discrete round particles, the coverslip is rendered as an opaque solid chip instead of a thin transparent square, or the microscope field shows amorphous crystals rather than rounded particles.
level_4: All five setup elements appear in the correct order and each is recognizable by its shape and role: the microcapsules as small round particles distinct from the background, the slide as a flat rectangular glass surface, the water as a clear convex droplet, the coverslip as a thin transparent square, and the microscope view as a circular magnified field containing visible round particles; a viewer could correctly label every element and every step; only cosmetic imperfections remain, such as a slightly uneven hand motion while lowering the coverslip or a brief glare on the glass that does not obscure any element.
level_5: All five setup elements are rendered with unambiguous clarity in the correct order: individually distinguishable round microcapsules are visible on the slide before water is added, the water droplet visibly beads on contact with the powder, the coverslip visibly descends onto and flattens the droplet, and the microscope view is centered, in focus, and clearly shows multiple discrete round particles; no element is occluded, duplicated, or substituted at any point, and it is visually unambiguous at every moment which of the five elements or steps is being shown.

Scientific and Causal Correctness rubric:
level_1: No scientifically plausible microcapsule behavior is shown: e.g., the microcapsules dissolve completely on contact with the water droplet, change color, or vanish, and the microscope view shows no discrete particles at all; this contradicts the basic premise that intact, water-insoluble microcapsules can be observed under water-mounted microscopy.
level_2: At least one depicted behavior directly contradicts vitamin C microcapsule chemistry: e.g., the microcapsules are shown fused into a single clump before the water droplet ever touches them, the water droplet spreads flat across the whole slide with no bead shape at any point, the coverslip causes the microcapsules to burst or leak color into the water, or the microscope view shows needle-like crystals or cell-like structures instead of round particles.
level_3: The microcapsules appear as discrete solid round particles on the dry slide, the water droplet forms a distinct convex bead on contact, the coverslip is lowered over the droplet without visible spillage, and the microscope view shows round particles, but at least one causal detail is scientifically off, such as the particles appearing softened or swollen before the water droplet ever reaches them, particle shape changing without the water droplet being visibly present, or the microscope view showing no visible contrast between an outer shell and an inner core.
level_4: All depicted phenomena are consistent with vitamin C microcapsule science: the microcapsules stay intact and round on the dry slide, the water droplet beads on the powder without dissolving it, the coverslip flattens the droplet into a thin film without rupturing any particle, and the microscope view shows round, separated particles with smooth, sharply defined edges; only non-causal cosmetic issues remain, such as slightly boosted particle brightness that does not change the perceived round shape.
level_5: Every depicted phenomenon matches vitamin C microcapsule science with no error: the microcapsules remain round and physically separate from each other before, during, and after the water droplet is added; the droplet keeps a convex, clear meniscus with no cloudiness; the coverslip contacts and flattens the droplet with no bursting or color leaking into the water; and the microscope view shows sharp, evenly lit, round microcapsules dispersed in the water with no swelling, dissolving, clumping, or shape change at any point in the sequence.

Spatiotemporal Consistency rubric:
level_1: Severe spatiotemporal breaks dominate the video: the slide, water droplet, or coverslip jumps to a different position between consecutive frames with no connecting motion shown, the shot cuts straight from an empty slide to a fully assembled microscope view with none of the intermediate steps ever appearing, the coverslip snaps down onto the slide with no downward motion at all, or the bench lighting swings abruptly from bright to dark (or dark to bright) between consecutive frames with no visible cause.
level_2: Several distinct continuity breaks occur: e.g., the water droplet's size or shape changes abruptly between two frames with no gradual spreading or beading shown, the coverslip's orientation changes by a large angle with no hand or tool visible moving it, the view cuts from the bench setup to the microscope field as a jarring, unexplained jump, or the illumination on the slide switches character (for example from soft even lighting to a hard directional glare) between one shot and the next with no light source or camera shown moving.
level_3: One clear spatiotemporal flaw occurs while the rest of the sequence is continuous: e.g., the microcapsules appear already surrounded by the water droplet with the water-addition motion skipped, the coverslip appears fully seated on the slide with the lowering motion skipped, the cut to the microscope view happens before the coverslip has visibly settled, or the slide's edge appears to bend or warp for a moment during the observation shot.
level_4: The slide, water droplet, and coverslip keep stable size, shape, and position relative to the bench throughout, the coverslip's descent is smooth and slows naturally just before contact, no microcapsule, droplet, or coverslip blinks out of view and reappears between frames, and the transition into the microscope view reads as a continuous zoom or clean cut rather than a jarring jump; only one minor flaw remains, such as brief refocusing blur in the final microscope shot that does not hide the microcapsules.
level_5: The entire sequence reads as one physically coherent take: the microcapsules sit stationary on the slide until the water droplet visibly lands and beads on contact, the coverslip descends smoothly, touches the droplet, and settles flat without bouncing or sliding sideways, the transition into the microscope view is a continuous focus pull or clean cut with no jump in scale or position, and the illumination visible on the bench during setup and inside the microscope field during observation both look like they come from one steady light source, with no unexplained switch to a harsh directional glare or back.