Multiple Choice
Which of the following statements correctly defines a molecule?
2. Atoms & Elements
The Atom
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According to the Law of Conservation of Mass, where does most of a plant's biomass come from?
A
Sunlight absorbed by the leaves
B
Carbon dioxide absorbed from the air
C
Water absorbed by the roots
D
Nutrients from the soil
Verified step by step guidance1
Understand the Law of Conservation of Mass, which states that mass is neither created nor destroyed in a chemical reaction. This principle applies to the growth of plants as well.
Consider the process of photosynthesis, where plants convert carbon dioxide (
) and water (
) into glucose (
) and oxygen (
). This process is crucial for plant growth.
Recognize that the carbon atoms in glucose, which contribute significantly to the plant's biomass, originate from carbon dioxide absorbed from the air.
Evaluate the role of sunlight in photosynthesis. While sunlight provides the energy needed for the reaction, it does not contribute to the mass of the plant.
Consider the contributions of water and soil nutrients. Water is involved in photosynthesis and nutrient transport, but the primary source of biomass is the carbon from carbon dioxide.
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