Across
- 4. a tiny part in a plant containing chlorophyll—chloroplasts are where photosynthesis occurs
- 7. a substance, like starch or sugar, that is rich in energy and made up of carbon, hydrogen, and oxygen
- 10. the process by which plant cells use light to convert carbon dioxide and water into sugar, which is food for the plant
- 11. chain a way of describing how animals gain energy and matter from other organisms
- 12. one of the small openings on the surface of plant leaves through which gas exchange happens
- 13. a substance needed for healthy growth, development, and functioning
- 14. a gas found in the Earth's atmosphere, it is made up of two oxygen atoms and is necessary for life—the symbol for oxygen is O
Down
- 1. dioxide a gas found in the Earth's atmosphere, its molecules have one carbon atom and two oxygen atoms—it is a waste product of respiration in living things and also acts as a greenhouse gas, trapping energy from the Sun in the Earth's atmosphere
- 2. a simple sugar, often in the form of a carbohydrate, produced through photosynthesis
- 3. the substance everything is made of, something that takes up space and has weight
- 5. a method of growing plants in a nutrient solution, with or without the support of soil, sand, or gravel
- 6. a method of growing plants by suspending their roots in the air and spraying them with nutrient solutions
- 8. the cultivating of the soil, producing of crops, and raising of livestock
- 9. a gas, it is very common in the Universe and forms part of water—the symbol for hydrogen is H