- 1. The smallest unit of matter.
A) organelle
B) atom
C) molecule
- 2. A substance, made of atoms, that cannot be broken down into smaller substances.
A) organelle
B) element
C) molecule
- 3. A substance created when two or more atoms form chemical bonds with each other. It doesn't matter if the atoms are the same or are different from each other.
A) element
B) atom
C) molecule
- 4. a substance that is present at the start of a chemical reaction (an ingredient)
A) product
B) reactant
- 5. a substance obtained from another substance as a result of a chemical reaction (a result)
A) product
B) reactant
- 6. the organelle that contains chlorophyll
A) vacuole
B) chloroplast
C) cell wall
- 7. the green pigment of plants that traps the energy of sunlight for photosynthesis
A) chlorophyll
B) cytoplasm
C) cell wall
- 8. the complex process by which carbon dioxide and water are converted into glucose and oxygen by green plants, using energy from the sun and chlorophyll.
A) combustion
B) oxidation
C) photosynthesis
- 9. A simple sugar found in plant tissues. It is a product of photosynthesis.
A) fatty acids
B) aminio acids
C) glucose
- 10. An element found in water AND carbon dioxide. It is used to create glucose.
A) oxygen
B) hydrogen
C) carbon
- 11. An element found in water. It is used to create glucose.
A) hydrogen
B) carbon
C) nitrogen
- 12. An element found in carbon dioxide. It is used to create glucose.
A) nitrogen
B) carbon
C) hydrogen
- 13. a molecule made of carbon and oxygen atoms. It is a reactant in photosynthesis.
A) carbon dioxide
B) water
C) sodium chloride
- 14. a molecule made of hydrogen and oxygen atoms. It is a reactant in photosynthesis.
A) carbon dioxide
B) sodium chloride
C) water
- 15. A molecule made of two oxygen atoms. It is a product of photosynthesis.
A) oxygen molecule
B) carbon molecule
C) hydrogen molecule
- 16. The energy source for photosynthesis. It is used to break up the bonds of the reactants to form the products.
A) water
B) sunlight
C) mitochondria
- 17. The chemical equation for photosynthesis
A) 6O2 + 6H2O --->using sunlight ---> C6H12O6 + 6CO2
B) 6CO2 + 6O2 --->using sunlight ---> C6H12O6 + 6H2O
C) 6CO2 + C6H12O6 --->using sunlight ---> 6H2O + 6O2
D) 6CO2 + 6H2O --->using sunlight ---> C6H12O6 + 6O2
- 18. This organelle combines oxygen with glucose to form ATP or energy for the body.
A) mitochondria
B) nucleus
C) ribosome
D) chloroplast
- 19. Holes in plant leaves that allow carbon dioxide to enter and oxygen to leave.
A) chloroplast
B) roots
C) stomata
D) chlorphyll
- 20. The part of the plant that absorbs water and minerals from the soil.
A) stomata
B) chloroplast
C) chlorphyll
D) roots
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