Biology · KS3 Y8 · Cells & Organisation

The leaf as an organ

The leaf as an organFree2:50Heddy Score 3 of 7, below the standard
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What you need to know

  • Leaves are built to collect the three needs of photosynthesis: water, carbon dioxide and light.
  • Carbon dioxide enters through stomata, which are mostly on the underside of the leaf.
  • Guard cells open and close the stomata, balancing gas exchange against water loss, and many plants close them at night.
  • Chloroplasts containing chlorophyll absorb light, and leaf size, shape and waxy cuticle suit the plant's habitat.

In this clip

Runs 2:50, from 4:31 to 7:21 of the full video.

Also coversHabitats & adaptation
Heddy Score3/7, Below the standard
See the seven stars
  • Trusted source · passed. The creator's own upload, live and playable here.
  • On the map · not judged yet. A teacher watched it: it mainly teaches this map topic.
  • Spec-true · not judged yet. Accurate, and right for the current UK specification.
  • Focused · passed. One idea, short enough to watch in one go.
  • Accessible · passed. Good captions, clear sound and pictures.
  • Safe for children · not judged yet. Right for 11 to 16 year olds, with no sales pitch.
  • Proven · not judged yet. Earned from our students: they learn from it, find it helpful and watch it to the end.
★ passed · ☆ pending · ✕ failed
Our students

Not enough students yet

Our own students' answers. These are what move ★7 Proven.
On YouTube

1.16M views · 11.2K likes · Amoeba Sisters 2.98M subscribers

As reported by YouTube on 2026-11-01. Not part of the Heddy Score.
How the Heddy Score works

Why we picked it

Amoeba Sisters give a clear account of xylem and phloem, then explain how leaf structure collects what photosynthesis needs.

Amoeba Sisters on YouTubechecked 2026-10-22

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