Question

show what you know respiration 1. identify each of the following as a reactant or product of respiration. c6h12o6 sugar a: reactant o2 oxygen b: reactant h2o water c: product answer the following questions: 2. where in the cell does respiration occur? a. endoplasmic reticulum b. mitochondria c. the nucleus d. chloroplast 3. what is the purpose of having mitochondria in plant cells when they already have chloroplasts? a. to store water b. to transform energy from sunlight into sugar c. to transform sugar into energy d. to store nutrients 4. respiration is a __________ reaction in which sugar is oxidized to produce energy. 5. the energy produced by respiration is in the form of adenosinetriphosphate or ________. 6. the reactants and products for respiration are exactly the same for a plant cell and an animal cell, the difference is the __________ of the reactants. 7. what is the relationship between the chemical reaction for photosynthesis and the chemical reaction for respiration? 8. although plants produce and release oxygen during photosynthesis, they also require it. why? 9. what is the chemical equation (balanced!) for cellular respiration?

Explanation:

1. Sugar ($C_6H_{12}O_6$) and oxygen ($O_2$) are reactants in respiration. Water ($H_2O$) is a product.
2. Respiration occurs in the mitochondria.
3. Mitochondria transform sugar into energy in plant cells. Chloroplasts convert sunlight into sugar.
4. Respiration is an oxidation - reaction to produce energy.
5. The energy from respiration is in the form of adenosine triphosphate (ATP).
6. The difference between plant and animal cell respiration is the source of reactants.
7. Photosynthesis and respiration are reverse chemical reactions. Photosynthesis uses carbon - dioxide and water to make sugar and oxygen, while respiration uses sugar and oxygen to make carbon - dioxide, water and energy.
8. Plants need oxygen for respiration to break down sugar for energy.
9. The balanced chemical equation for cellular respiration is $C_6H_{12}O_6 + 6O_2

ightarrow6CO_2+6H_2O + \text{energy}$.

Answer:

1. A. Reactant; B. Reactant; C. Product
2. d. the mitochondria
3. c. to transform sugar into energy
4. oxidation
5. ATP
6. source
7. They are reverse chemical reactions.
8. For respiration to break down sugar for energy.
9. $C_6H_{12}O_6 + 6O_2

ightarrow6CO_2+6H_2O + \text{energy}$