practice questions: 1. our (human) cells need atp to function. where does the energy from atp originally come from? a. glucose b. starch c. sun d. chlorophyll 2. what process is involved in converting sunlight energy to energy stored in glucose? a. cellular respiration b. photosynthesis c. digestion d. both a and b 3. what process is involved in converting energy stored in glucose to energy stored in atp? a. cellular respiration b. photosynthesis c. digestion d. both a and b 4. which of the following process(es) do plants perform? a. cellular respiration b. photosynthesis c. digestion d. both a and b 5. oxygen is a waste product of photosynthesis. where does the oxygen originally come from? a. carbon dioxide b. water c. atp d. glucose 6. which stage of photosynthesis is oxygen produced? a. light independent reaction/calvin cycle b. light dependent reaction 7. which stage of photosynthesis is glucose produced? a. light independent reaction/calvin cycle b. light dependent reaction 8. in addition to light and chlorophyll, photosynthesis requires: a. water b. carbon dioxide c. glucose d. oxygen e. both a and b f. both c and d

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Accepted Answer

### Question 1
# Brief Explanations:
ATP's energy in human cells ultimately traces back to the sun. Plants capture solar energy via photosynthesis, store it in glucose, and humans obtain glucose (and then convert it to ATP) from food sources like plants. Glucose is a product of photosynthesis, starch is a storage form in plants, and chlorophyll is a pigment for photosynthesis, not the energy source. So the original energy source is the sun.
# Answer:
c. Sun

### Question 2
# Brief Explanations:
Photosynthesis is the process where plants (and some organisms) convert sunlight energy into chemical energy stored in glucose. Cellular respiration breaks down glucose for energy, digestion breaks down food, and photosynthesis is the specific process for converting sunlight to glucose - stored energy.
# Answer:
b. Photosynthesis

### Question 3
# Brief Explanations:
Cellular respiration is the process that breaks down glucose (where energy is stored) and converts that energy into ATP. Photosynthesis makes glucose, digestion breaks down food into nutrients, so cellular respiration is the process for converting glucose - stored energy to ATP - stored energy.
# Answer:
a. Cellular respiration

### Question 4
# Brief Explanations:
Plants perform photosynthesis to make glucose and cellular respiration to break down glucose for energy (all living cells do cellular respiration). Digestion is a process in organisms with digestive systems, and plants don't have a digestive system. So plants perform both cellular respiration and photosynthesis.
# Answer:
d. Both a and b

### Question 5
# Brief Explanations:
In photosynthesis, the light - dependent reactions split water ($H_2O$) into oxygen, protons, and electrons. The oxygen is released as a waste product. Carbon dioxide is used in the Calvin cycle to make glucose, ATP is an energy carrier, and glucose is a product, so the oxygen comes from water.
# Answer:
b. Water

### Question 6
# Brief Explanations:
The light - dependent reactions of photosynthesis involve the splitting of water, and this process releases oxygen. The light - independent reaction (Calvin cycle) is about making glucose from carbon dioxide, so oxygen is produced in the light - dependent reaction.
# Answer:
b. Light Dependent Reaction

### Question 7
# Brief Explanations:
The light - independent reaction (Calvin cycle) uses the products of the light - dependent reactions (ATP, NADPH) to fix carbon dioxide and produce glucose. The light - dependent reaction produces ATP and NADPH, so glucose is produced in the light - independent reaction.
# Answer:
a. Light Independent Reaction/Calvin Cycle

### Question 8
# Brief Explanations:
The reactants of photosynthesis are light, chlorophyll (pigment), water, and carbon dioxide. Glucose and oxygen are products. So in addition to light and chlorophyll, photosynthesis requires both water and carbon dioxide.
# Answer:
e. Both a and b

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