The oak tree and soil organisms are part of material cycles in a woodland ecosystem.
Use words from the box to complete the sentences. Each word may be used once, more than once, or not at all.
| amino acids | carbon dioxide | decompose |
| glucose | nitrates | respire |
The oak tree absorbs dissolved ..... from the soil through its root hair cells to synthesise proteins.
Saprobiontic fungi and bacteria in the soil will ..... dead organic matter, returning mineral ions to the environment.
