Glossary of biology

4. The pathway by which carbon atoms cycle between organisms and the environment.
7. A meteor that has landed on the surface of the Earth.
8. intensity, The strength or quantity of light.
10. Long threads of DNA, found in the nucleus of a cell.
11. Parts of a chromosome that determine a feature of an organism.
13. The quantity of a crop that is harvested.
14. Long, hollow tubes through which water moves in a plant; they are made up of dead, empty cells joined end to end.
16. Small holes in the epidermis of a leaf, which allow gases to diffuse into and out of the leaf
17. The loss of water vapour from a plant‘s leaves.
18. Objects in space that are smaller than an asteroid.
19. Specialised cells on the outer surface of a root, which absorb water and mineral ions from the soil.
20. A young animal developing inside the uterus.

1. A substance containing minerals, which is added to soil to help plants to grow well.
2. The way that plants make glucose and oxygen from carbon dioxide and water, using energy from light.
3. To do with a fetus.
5. partly-melted snow
6. A green pigment found inside chloroplasts in some plant cells, which captures energy from light.
9. The loss of large numbers of species.
12. collapsed; plant leaves become like that if they are short of water.
15. Meteoroids as they are moving through the Earth's atmosphere.