SCIENCE

4. Sharp, modified leaves on a cactus that help reduce water loss.
5. Tiny, building-block units that make up all solids, liquids, and gases.
7. The sticky top part of the female reproductive organ that catches pollen.
13. The process where a seed begins to sprout and grow into a young plant.
14. The gas that makes up the largest percentage (~78%) of Earth's atmosphere.
16. The female reproductive structure of a flower (also known as the pistil).

1. State of matter that has a fixed shape and fixed volume.
2. The state of matter where particles are spread far apart and move rapidly.
3. The process when a male pollen cell joins with a female egg inside the ovary.
6. The process of a liquid turning into a gas when heated.
7. The male part of a flower that produces pollen.
8. The green pigment in leaves that absorbs light energy for photosynthesis.
9. State of matter that flows and takes the shape of its container, but has a fixed volume.
10. The scattering of seeds away from the parent plant.
11. What the ovary of a flower turns into after fertilisation.
12. The gas that human beings and animals need to breathe to survive.
15. The sweet liquid produced by flowers to attract insects and birds.