Photosynthesis and Cellular Respiration

3. A reaction that absorbs energy from its surroundings, usually in the form of heat.
4. The solid part of the Earth, consisting of rocks, minerals, and soil.
6. An organelle known as the powerhouse of the cell, where ATP is produced.
7. A process that leads to the transformation of one set of chemical substances to another.
9. The attraction between atoms that allows the formation of chemical substances.
14. A reaction that releases energy, usually in the form of heat.
16. An organelle in plant cells where photosynthesis takes place.
17. A substance that is formed as a result of a chemical reaction.
18. A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound.
21. Energy that travels by waves or particles, particularly electromagnetic radiation such as light.
22. The process by which green plants use sunlight to synthesize foods with the help of chlorophyll.
23. A green pigment found in plants that is essential for photosynthesis.
24. All the water on Earth's surface, including oceans, rivers, and lakes.
25. A substance that takes part in and undergoes change during a chemical reaction.

1. The series of processes by which carbon compounds are interconverted in the environment.
2. Referring to processes that require oxygen to occur.
5. A simple sugar that is an important energy source in living organisms.
8. A substance that gives color to plant tissues and is involved in photosynthesis.
10. Referring to processes that occur without oxygen.
11. Energy stored in the bonds of chemical compounds, which can be released during a chemical reaction.
12. Adenosine triphosphate, the primary energy carrier in cells.
13. The process by which cells convert glucose and oxygen into energy, carbon dioxide, and water.
15. The stored energy in an object due to its position or arrangement.
19. The layer of gases surrounding the Earth, essential for life.
20. The global sum of all ecosystems, representing the zone of life on Earth.