Cambridge O Level Biology · Syllabus 5090 · Development of Organisms and Continuity of Life
Germination
What is Germination?
The beginning of growth of the embryo in a seed, once conditions are suitable. Germination requires water, a suitable temperature and oxygen, and it begins with the seed absorbing water and ends with the radicle and then the plumule emerging.
This definition is part of the Development of Organisms and Continuity of Life chapter in Cambridge O Level Biology.
Common mistakes with Germination
- “Light is required for germination.” Why wrong Seeds are usually buried and germinate in the dark. Light is needed for photosynthesis, which comes after germination. Say instead Germination requires water, a suitable temperature and oxygen. If a supplied experiment shows a light effect for one species, report that result without generalising it.
Questions students ask about Germination
Do seeds need light to germinate?
Generally no. Germination requires water, a suitable temperature and oxygen. Most seeds are buried and germinate in the dark. Light becomes necessary afterwards, when the seedling's leaves reach the surface and it must photosynthesise because the food store in the cotyledons is running out. If a particular experiment shows a light effect for a named species, report that result without generalising it.