biology 1 week 6 review questions
1. what is on the left side of a chemical equation? reactants or products?
2. what is on the right side of a chemical equation? reactants or products?
3. circle the reactant: 2h2 + o2 → 2h2o
4. if a plant needed to make sugar what process would it use?
5. what is the equation for photosynthesis?
6. would 3 molecules of h2o be enough to start a photosynthesis reaction?
7. what is the light reaction? where does it take place?
8. what is the dark reaction? where does it take place?
9. when making purses, the amount of leather you have limits how many can be made, what is this an example of?
10. how many molecules of oxygen are produced during one reaction of photosynthesis?
11. what are the 4 limiting factors of photosynthesis?
12. if 15 molecules of glucose were made, how many times did photosynthesis occur?
13. if there was unlimited light available what would happen to the rate of photosynthesis as the light intensity increased?

Question

Accepted Answer

### Question 1
# Brief Explanations:
In a chemical equation, the left - hand side represents the substances that undergo the reaction, which are called reactants. For example, in the reaction $A + B
ightarrow C+D$, $A$ and $B$ are reactants.
# Answer:
Reactants

### Question 2
# Brief Explanations:
In a chemical equation, the right - hand side shows the substances that are formed as a result of the reaction, known as products. Taking the reaction $A + B
ightarrow C + D$ as an example, $C$ and $D$ are products.
# Answer:
Products

### Question 3
# Brief Explanations:
In the chemical equation $2H_2+O_2
ightarrow2H_2O$, the reactants are the substances on the left - hand side of the arrow. So $H_2$ (or $2H_2$) and $O_2$ are the reactants. We need to circle $H_2$ and $O_2$ (in the given equation, the reactants are $2H_2$ and $O_2$).
# Answer:
Circle $2H_2$ and $O_2$

### Question 4
# Brief Explanations:
Plants produce sugar (glucose) through the process of photosynthesis. In photosynthesis, plants use carbon dioxide, water, and light energy to synthesize glucose and oxygen.
# Answer:
Photosynthesis

### Question 5
# Brief Explanations:
The equation for photosynthesis is $6CO_2 + 6H_2O\xrightarrow[Chlorophyll]{Light}C_6H_{12}O_6+6O_2$. Carbon dioxide and water are converted into glucose and oxygen in the presence of light and chlorophyll.
# Answer:
$6CO_2 + 6H_2O\xrightarrow[Chlorophyll]{Light}C_6H_{12}O_6+6O_2$

### Question 6
# Brief Explanations:
The photosynthesis equation requires 6 molecules of $H_2O$ (from $6H_2O$ in the equation $6CO_2 + 6H_2O\xrightarrow[Chlorophyll]{Light}C_6H_{12}O_6+6O_2$). Since 3 is less than 6, 3 molecules of $H_2O$ are not enough.
# Answer:
No

### Question 7
# Brief Explanations:
The light reaction of photosynthesis is the stage where light energy is converted into chemical energy (in the form of ATP and NADPH). It takes place in the thylakoid membranes of the chloroplasts. In this reaction, water is split to release oxygen, and light energy is used to generate ATP and NADPH.
# Answer:
The light reaction is the stage of photosynthesis that converts light energy into chemical energy (ATP, NADPH) and splits water to release $O_2$; it takes place in the thylakoid membranes of chloroplasts.

### Question 8
# Brief Explanations:
The dark reaction (also known as the Calvin cycle) is the stage of photosynthesis that uses the ATP and NADPH from the light reaction to convert carbon dioxide into glucose (a sugar). It takes place in the stroma of the chloroplasts.
# Answer:
The dark reaction (Calvin cycle) uses ATP and NADPH to fix $CO_2$ into glucose; it takes place in the stroma of chloroplasts.

### Question 9
# Brief Explanations:
In the example of making purses, the amount of leather is a limiting factor. A limiting factor is a resource or condition that limits the rate or extent of a process (in this case, the number of purses that can be made). Just like in photosynthesis, factors like light, water, etc., can limit the rate of the process.
# Answer:
Limiting factor

### Question 10
# Brief Explanations:
From the photosynthesis equation $6CO_2 + 6H_2O\xrightarrow[Chlorophyll]{Light}C_6H_{12}O_6+6O_2$, we can see that 6 molecules of oxygen are produced per one photosynthesis reaction.
# Answer:
6

### Question 11
# Brief Explanations:
The four main limiting factors of photosynthesis are light intensity (affects the light reaction), carbon dioxide concentration (affects the dark reaction), temperature (affects the rate of enzyme - catalyzed reactions in photosynthesis), and the amount of chlorophyll (the pigment that absorbs light).
# Answer:
Light intensity, carbon dioxide concentration, temperature, amount of chlorophyll

### Question 12
# Brief Explanations:
From the photosynthesis equation $6CO_2 + 6H_2O\xrightarrow[Chlorophyll]{Light}C_6H_{12}O_6+6O_2$, one photosynthesis reaction produces 1 molecule of glucose. If 15 molecules of glucose are made, then the number of times photosynthesis occurred is equal to the number of glucose molecules, so it is 15 times.
# Answer:
15

### Question 13
# Brief Explanations:
If light is unlimited, initially, as light intensity increases, the rate of photosynthesis will increase because more light energy is available for the light reaction (more ATP and NADPH can be produced). However, at a certain point, other factors (like $CO_2$ concentration, temperature, or enzyme availability) will become limiting, and the rate will stop increasing and reach a plateau. But if we assume only light is considered and other factors are non - limiting (which is a theoretical case), the rate will increase with increasing light intensity until other factors limit it. But in most cases, when light is the only factor considered and it's unlimited in the sense that other factors are sufficient, the rate will increase as light intensity increases (up to the point where the system is saturated, but the question says "unlimited light available" which is a bit of a theoretical scenario, so the rate will increase with increasing light intensity).
# Answer:
The rate of photosynthesis will increase as light intensity increases (until other factors become limiting, but with unlimited light assumed, it will keep increasing as light intensity rises).

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