Question

what is the main purpose of photosynthesis?
a to absorb oxygen and release carbon dioxide
b to convert solar energy into chemical energy stored in carbohydrates
c to release energy from glucose for cell use
d to break down chemical bonds in atp
question 16 (1 point)
what are the reactants (inputs) for photosynthesis?
a nitrogen and hydrogen
b carbon dioxide and water
c oxygen and glucose
d carbon monoxide and water
question 17 (1 point)
what are the products (outputs) of photosynthesis?
a glucose and oxygen
b oxygen and nitrogen
c atp and carbon monoxide
d water and carbon dioxide

Explanation:

• For the first question: Photosynthesis is the process by which plants use sunlight to convert carbon dioxide and water into glucose (a carbohydrate) and oxygen. The main purpose is to convert solar energy into chemical energy stored in carbohydrates. Option a is the opposite of photosynthesis (more like respiration in some aspects), option c is about cellular respiration (releasing energy from glucose), option d is not related to photosynthesis's main purpose.
• For the second question: The chemical equation for photosynthesis is \(6CO_2 + 6H_2O+light

ightarrow C_6H_{12}O_6 + 6O_2\). So the reactants (inputs) are carbon dioxide (\(CO_2\)) and water (\(H_2O\)). Nitrogen and hydrogen are not involved in the basic photosynthesis reaction (option a wrong), oxygen and glucose are products (option c wrong), carbon monoxide is not a reactant (option d wrong).

• For the third question: From the photosynthesis equation \(6CO_2 + 6H_2O+light

ightarrow C_6H_{12}O_6 + 6O_2\), the products (outputs) are glucose (\(C_6H_{12}O_6\)) and oxygen (\(O_2\)). Nitrogen is not a product (option b wrong), ATP is not a direct product (option c wrong), water and carbon dioxide are reactants (option d wrong).

Answer:

• First question: B. To convert solar energy into chemical energy stored in carbohydrates
• Second question: B. Carbon dioxide and water
• Third question: A. Glucose and oxygen