What is meant by the term photosynthesis?
Reveal answer
An endothermic process using light energy to synthesise glucose from carbon dioxide and water.
Key words: photosynthesis
2(e) NUTRITION · RECALL
2.18 Photosynthesis and energy conversion
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What is meant by the term chlorophyll?
Reveal answer
A pigment that absorbs light energy for photosynthesis.
Key words: chlorophyll
What is meant by the term chemical energy?
Reveal answer
Energy associated with chemical structure and transferred during reactions.
Key words: chemical energy
What is meant by the term producer?
Reveal answer
An organism that synthesises organic molecules from inorganic raw materials.
Key words: producer
What is meant by the term net gas exchange?
Reveal answer
The overall gas movement after photosynthesis and respiration are both considered.
Key words: net gas exchange
Inputs, process and fates, Light energy. Role in photosynthesis? Later fate or significance?
Reveal answer
Role in photosynthesis: Absorbed by chlorophyll. Later fate or significance: Transferred into chemical energy stores.
Key words: Light energy
Inputs, process and fates, Carbon dioxide. Role in photosynthesis? Later fate or significance?
Reveal answer
Role in photosynthesis: Supplies carbon atoms. Later fate or significance: Becomes part of glucose and other organic molecules.
Key words: Carbon dioxide
Inputs, process and fates, Water. Role in photosynthesis? Later fate or significance?
Reveal answer
Role in photosynthesis: Supplies hydrogen and electrons in the overall process. Later fate or significance: Also supports transport and cell turgor.
Key words: Water
Inputs, process and fates, Glucose. Role in photosynthesis? Later fate or significance?
Reveal answer
Role in photosynthesis: Organic product. Later fate or significance: Respiration, starch, cellulose, lipid and amino-acid synthesis.
Key words: Glucose
Inputs, process and fates, Oxygen. Role in photosynthesis? Later fate or significance?
Reveal answer
Role in photosynthesis: Released product. Later fate or significance: Used in aerobic respiration by many organisms.
Key words: Oxygen
True or false, and why? “Plants get their food from the soil.”
Reveal answer
False. They absorb water and mineral ions from soil but synthesise organic molecules using carbon dioxide and light energy.
True or false, and why? “Sunlight is a material reactant.”
Reveal answer
False. Light transfers energy; carbon dioxide and water supply matter.
True or false, and why? “Plants do not respire.”
Reveal answer
False. Plant cells respire continuously, including while photosynthesis occurs.
True or false, and why? “Photosynthesis creates energy.”
Reveal answer
False. It transfers light energy into chemical energy stores.
What energy change happens in photosynthesis?
Reveal answer
Light energy is transferred to chemical energy stored in glucose.
Key words: light energy · chemical energy