Domain: Natural Science — Morphology
Target concept: Growth under nutrient sufficient conditions vs. growth in phosphorus-deficient soil

Video generation prompt: Plant the same seedlings separately in two pots: the blue pot is filled with complete nutrient soil, and the red pot is filled with phosphorus-deficient soil. Place them side by side within a few weeks, providing identical light and watering conditions.

Evaluation guide:
(i) Target concept: Phosphorus deficiency induces specific, observable morphological adaptations in plants (stunting and anthocyanin-based purpling), distinct from general stress responses.
Minimum mechanism: Anthocyanin synthesis is upregulated under P-deficiency due to sugar accumulation and disrupted phosphate-dependent metabolism; this pigment accumulates preferentially in vascular tissues and abaxial epidermis, not uniformly or in response to light alone.
(ii)Storyline: [Phase 1: Setup] Two empty pots (blue/red) enter frame side-by-side → seedlings planted simultaneously into each → soil leveled → identical watering motion applied to both. [Phase 2: Growth interval] Time-lapse implied via subtle ambient light shift (no clock/text), no object movement. [Phase 3: Observation] Final frame holds steady: full view of both pots with seedlings fully visible, no occlusion, fixed camera, clear color and size contrast. Perspective must be frontal, eye-level, centered on pot rims: no top-down or oblique angle that distorts relative height or obscures stem bases.

Manual:
Experimental Procedure
1. Plant identical seedlings in two pots: blue pot with complete nutrient soil, red pot with phosphorus-deficient soil.
2. Place pots side-by-side under identical light and watering conditions.
Observation of Experimental Phenomena
After several weeks: red-pot seedling is shorter, has purplish-red stem base and leaf undersides, and darker green upper leaves; blue-pot seedling is taller and uniformly green.
Summary of Experimental Principles
Phosphorus deficiency inhibits energy transfer and nucleic acid synthesis, causing stunted growth and anthocyanin accumulation (purple-red pigment) in stems and leaf undersides — a diagnostic morphological adaptation.

Prompt Grounding rubric:
level_1: No two pots visible; no seedlings present; no blue or red pot color differentiation; no side-by-side spatial arrangement; no indication of planting or identical treatment.
level_2: Two pots present but same color (e.g., both blue or both red); or only one seedling visible; or pots not placed side-by-side; or watering/light actions absent or mismatched in number (e.g., water applied to only one pot).
level_3: Two pots visible and distinguishable by color (one blue, one red); two seedlings present (one in each pot); pots placed side-by-side in same frame; identical watering action shown once to each pot OR single simultaneous watering motion over both; lighting implied as uniform (no directional shadow asymmetry between pots).
level_4: All 3-point conditions satisfied AND both pots contain visibly identical seedlings at time of planting (same size, orientation, leaf count); watering action is clearly applied to both pots in synchrony (e.g., single pour split visually across both pots or two identical motions with matching timing/height/direction); no extraneous objects (e.g., labels, hands, tools) occluding pots or seedlings.
level_5: All 4-point conditions satisfied AND blue pot is exclusively blue-colored (no red tint, no pattern), red pot is exclusively red-colored (no blue tint, no pattern); seedlings are identically positioned vertically centered in each pot; no motion blur obscuring pot colors or seedling presence; no frame cut, zoom, or repositioning during the entire 10-second sequence; fixed viewpoint maintained.

Scientific and Causal Correctness rubric:
level_1: No growth difference visible; both seedlings appear identical in size, color, and vigor; or phosphorus-deficient seedling shows enhanced growth; or color change contradicts plant physiology (e.g., red leaves in deficient plant).
level_2: Growth difference present but inconsistent with phosphorus deficiency: e.g., red-pot seedling taller but greener; or blue-pot seedling yellowed/stunted; or color change occurs in wrong pot (e.g., blue-pot plant shows purple stem base).
level_3: Red-pot seedling is visibly smaller in height and has darker green or purplish-red coloration on stems/undersides of leaves; blue-pot seedling is taller and uniformly green; no contradictory symptoms (e.g., wilting or necrosis in either pot).
level_4: All 3-point conditions satisfied AND red-pot seedling shows compact growth habit (shorter internodes, smaller leaves) while blue-pot seedling shows extended growth habit (longer internodes, larger leaves); stem base of red-pot seedling exhibits distinct purplish-red pigmentation; leaf color contrast is consistent across all visible foliage (no mixed-color leaves in same plant).
level_5: All 4-point conditions satisfied AND purplish-red pigmentation is confined to stem base and abaxial (lower) leaf surfaces in red-pot seedling only; blue-pot seedling shows zero purplish discoloration anywhere; leaf size ratio (red vs. blue) is visibly discrepant with no overlap in scale perception; no senescence, spotting, or disease-like symptoms in either plant; only nutrient-specific morphology differences present.

Spatiotemporal Consistency rubric:
level_1: Pots teleport between frames; seedlings appear/disappear without planting action; sudden lighting shift (e.g., shadow vanishes on one pot); structural break (e.g., pot rim discontinuous, seedling stem bent unnaturally across frames).
level_2: One pot rotates or shifts position relative to the other between shots; watering motion starts in air and ends outside pots; seedling orientation changes abruptly without physical cause (e.g., 90° twist between consecutive frames); light direction inconsistent (shadows point opposite ways on same surface).
level_3: Both pots remain fixed in relative position and orientation; seedlings remain upright and stationary after planting; lighting remains uniform and stable (shadows consistent in direction and softness on both pots); no object clipping, warping, or perspective distortion affecting pot shape or seedling geometry.
level_4: All 3-point conditions satisfied AND no temporal discontinuity (e.g., no jump-cut between planting and observation phases); no motion stutter or frame duplication; watering motion is continuous and physically plausible (liquid trajectory connects source to soil surface in both pots); no parallax error between pots (both remain fully in focus with consistent depth rendering).
level_5: All 4-point conditions satisfied AND zero inter-frame jitter or micro-shake; no lens flare, chromatic aberration, or depth-of-field collapse affecting either pot; pot rims and seedling edges remain sharply defined throughout; no temporal aliasing (e.g., no strobing on moving water droplets); background remains static and unchanging in texture and tone.