Domain: Engineering — Agricultural Engineering
Target concept: Dissect and observe the male flower (imperfect flower) of pumpkin, verify that it lacks a pistil, and possesses only sepals, petals, and stamens, demonstrating structural incompleteness.

Video generation prompt: Place a fresh male pumpkin flower on a tray, remove the petals with forceps, and then longitudinally dissect the flower with a scalpel to expose its internal structure.

Evaluation guide:
(i) Target concept: Structural demonstration of floral sexual unisexuality via direct anatomical observation of a male Cucurbita pepo flower.
Minimum mechanism: Biological integrity of fresh male flower specimen; mechanical competence of dissection to reveal internal whorls without tissue destruction; optical clarity sufficient to distinguish stamen morphology from pistil absence.
(ii)Storyline: Frame 1–2: Intact male pumpkin flower centered on tray, showing yellow petals + green calyx. Frame 3–4: Forceps grasp and lift away all five petals, revealing stamen column beneath. Frame 5–6: Scalpel aligns with floral axis and cuts longitudinally, splitting receptacle symmetrically. Frame 7–10: Dissected halves splay open, exposing stamens centrally and confirming complete absence of pistil tissue in the axis; view held steady, no occlusion, full anatomical legibility.

Manual:
Experimental Procedure
1. Place fresh male pumpkin flower on tray.
2. Use forceps to remove all petals.
3. Use scalpel to longitudinally dissect flower from apex to base.
Observation of Experimental Phenomena
After dissection: stamens (yellow anthers on fused filaments) are fully exposed in center; no pistil, stigma, or ovary present in floral axis.
Summary of Experimental Principles
Male pumpkin flowers are imperfect: they possess sepals, petals, and stamens—but lack a pistil—demonstrating structural incompleteness.

Prompt Grounding rubric:
level_1: No male pumpkin flower appears on any tray; neither forceps nor a scalpel is visible; no petal is removed and no longitudinal cut is made; the scene matches none of the objects or actions named in the prompt.
level_2: A male pumpkin flower is visible, but it is not resting on a tray, or only one of the two tools (forceps, scalpel) ever appears; the petals are not stripped away with forceps and no lengthwise cut is made with a scalpel; the required sequence (place on tray, remove petals, dissect) is missing a step or performed out of order.
level_3: The flower is placed on a tray, forceps strip away the petals, and a scalpel makes a single longitudinal cut through the flower, in that order; but either the cut fails to fully expose the fused stamen column, or the hollow center where a pistil would sit is not clearly visible once the cut is made.
level_4: All three actions occur in the correct order with the correct tools; the split-open flower stays in view with both the stamen column and the empty central axis visible, unobstructed by the forceps or scalpel; every petal is detached before the cut begins.
level_5: Meets every requirement of the 4-point level, and additionally the final open half-flower shows the fused yellow anther column sitting alone at the center with no petal fragments caught in the cut, no tool blocking the exposed tissue, and the cut receptacle held steady and legible through the closing frame.

Scientific and Causal Correctness rubric:
level_1: The dissected flower actually shows a pistil, stigma, or ovary (i.e., a female or bisexual flower is depicted), or the specimen is not a pumpkin flower at all; stamens are absent or a swollen ovary-like mass is mislabeled as the stamen column; the colors or shapes shown contradict a mature male Cucurbita pepo flower (e.g., no yellow-orange anthers).
level_2: The flower is a pumpkin flower, but its sex cannot be determined from the video: petals are removed yet the anther column stays hidden within surrounding tissue, or no stamens are ever exposed; when stamens are shown, they are the wrong color (e.g., pale green instead of yellow/orange) or appear as a single fused lump rather than a distinct column.
level_3: The flower is correctly shown to be male: once the petals are removed, the yellow-orange fused anther column is visible and no stigma, style, or ovary appears anywhere in the cut; however, the video does not clearly contrast the anther column against the hollow region where a pistil would normally sit (e.g., the base of the column is cropped or blocked from view).
level_4: All structures match a male Cucurbita pepo flower: green sepals, five yellow-orange petals removed by forceps, and a single fused staminal column at the center; after the longitudinal cut, no pistil, stigma, or ovary tissue appears at any point, and the area beneath/around the anther column reads as flat rather than swollen.
level_5: Meets every requirement of the 4-point level, and additionally the anther column shows plausible mature-flower detail (three fused anther lobes on one central filament, visibly coated in yellow pollen grains) while the floral axis around and beneath it stays smooth and unswollen, with no bump, remnant, or extra tissue anywhere that could be mistaken for a pistil base.

Spatiotemporal Consistency rubric:
level_1: The flower, tray, forceps, or scalpel jump to a different position, or vanish and reappear, between consecutive frames; the longitudinal cut appears before the petals have actually been removed; the tray itself disappears while the flower is mid-dissection; the light over the tray suddenly blanks out or floods the frame so the cut cannot be seen.
level_2: The tray visibly shifts or rotates between shots; the forceps or scalpel blink in and out of frame while mid-action; petal removal and the longitudinal cut appear to happen in the same instant with no separation between the two steps; the cutting motion skips (two or more visible jumps) or blurs badly enough that the exposed stamen column cannot be judged; the light over the tray brightens or dims noticeably partway through the sequence.
level_3: The flower stays in the same spot on the tray from the first frame to the last; the forceps and scalpel are each visible for the whole action they perform; every petal is removed before the scalpel makes contact, with a clear pause between the two steps; the light over the tray stays at roughly the same brightness and angle throughout; the flower tissue is not torn or warped in ways a real cut would not produce.
level_4: Meets every requirement of the 3-point level, and additionally the camera never pans, tilts, or zooms; the flower stays centered and fully in frame through all three steps; nothing blocks the view of the stamen region while it is being exposed; the forceps' grip-and-lift motion and the scalpel's entry angle (along the flower's long axis, not from the side) both look mechanically plausible.
level_5: Meets every requirement of the 4-point level, and additionally the whole sequence reads as one continuous, uninterrupted action: the forceps lift the petals away without dragging or re-gripping, the scalpel travels in a single unbroken pass from the top of the flower to its base, there is no visible camera shake or sudden frame-to-frame flicker, and the cut edges of the tissue separate smoothly (a slight natural spreading) rather than snapping open, stretching unnaturally, or looking distorted.