Question

levels of carbon dioxide in the ______ are fairly constant. it is in aquatic plants, e.g. pondweed, that we tend to see greater fluctuations in carbon dioxide concentrations. low levels of carbon dioxide ______ the rate of photosynthesis.

1. ______: photosynthesis is an enzyme - controlled reaction. high temperatures can ____ the enzymes so that they no longer work. low temperatures __ down enzyme activity, so the rate of photosynthesis is decreased. there is an ______ temperature at which the enzymes work at their best.

word bank: slow, chlorophyll, colors, temperature, altered, denature, optimal, atmosphere

Explanation:

Part 1 (Carbon Dioxide Section)

First Blank:

The first sentence is about the level of carbon dioxide in a certain place being fairly constant, and aquatic plants have more fluctuations. The word that fits here is "atmosphere" because atmospheric carbon dioxide levels are relatively stable compared to aquatic environments.

Second Blank:

Low levels of carbon dioxide would affect the rate of photosynthesis. Since carbon dioxide is a reactant in photosynthesis, low levels would "slow" the rate (as there's less of a key reactant).

Part 2 (Temperature Section - Labeled 9))

First Blank (Title):

The section is about how temperature affects photosynthesis (since it's about enzyme - controlled reactions and temperature's impact on enzymes). So the title should be "Temperature" (as it's the factor being discussed).

Second Blank:

High temperatures can "denature" enzymes. Denaturation is the process where enzymes lose their specific three - dimensional structure (including the active site) due to high temperature, and this makes them non - functional.

Third Blank:

Low temperatures "slow" down enzyme activity. Lower temperatures mean less kinetic energy for the enzyme and substrate molecules, so the rate of reaction (enzyme activity) decreases.

Fourth Blank:

There is an "optimal" temperature at which enzymes work at their best. Optimal temperature is the temperature range where the enzyme's activity is the highest, as the kinetic energy of molecules is just right for effective collisions between enzyme and substrate.

Filled - in Text:

• Levels of carbon dioxide in the \(\boldsymbol{\text{atmosphere}}\) are fairly constant. It is in aquatic plants, e.g. pondweed, that we tend to see greater fluctuations in carbon dioxide concentrations. Low levels of carbon dioxide \(\boldsymbol{\text{slow}}\) the rate of photosynthesis.
• 9) \(\boldsymbol{\text{Temperature}}\): photosynthesis is an enzyme - controlled reaction. High temperatures can \(\boldsymbol{\text{denature}}\) the enzymes so that they no longer work. Low temperatures \(\boldsymbol{\text{slow}}\) down enzyme activity, so the rate of photosynthesis is decreased. There is an \(\boldsymbol{\text{optimal}}\) temperature at which the enzymes work at their best.

Answer:

Part 1 (Carbon Dioxide Section)

First Blank:

The first sentence is about the level of carbon dioxide in a certain place being fairly constant, and aquatic plants have more fluctuations. The word that fits here is "atmosphere" because atmospheric carbon dioxide levels are relatively stable compared to aquatic environments.

Second Blank:

Low levels of carbon dioxide would affect the rate of photosynthesis. Since carbon dioxide is a reactant in photosynthesis, low levels would "slow" the rate (as there's less of a key reactant).

Part 2 (Temperature Section - Labeled 9))

First Blank (Title):

The section is about how temperature affects photosynthesis (since it's about enzyme - controlled reactions and temperature's impact on enzymes). So the title should be "Temperature" (as it's the factor being discussed).

Second Blank:

High temperatures can "denature" enzymes. Denaturation is the process where enzymes lose their specific three - dimensional structure (including the active site) due to high temperature, and this makes them non - functional.

Third Blank:

Low temperatures "slow" down enzyme activity. Lower temperatures mean less kinetic energy for the enzyme and substrate molecules, so the rate of reaction (enzyme activity) decreases.

Fourth Blank:

There is an "optimal" temperature at which enzymes work at their best. Optimal temperature is the temperature range where the enzyme's activity is the highest, as the kinetic energy of molecules is just right for effective collisions between enzyme and substrate.

Filled - in Text:

• Levels of carbon dioxide in the \(\boldsymbol{\text{atmosphere}}\) are fairly constant. It is in aquatic plants, e.g. pondweed, that we tend to see greater fluctuations in carbon dioxide concentrations. Low levels of carbon dioxide \(\boldsymbol{\text{slow}}\) the rate of photosynthesis.
• 9) \(\boldsymbol{\text{Temperature}}\): photosynthesis is an enzyme - controlled reaction. High temperatures can \(\boldsymbol{\text{denature}}\) the enzymes so that they no longer work. Low temperatures \(\boldsymbol{\text{slow}}\) down enzyme activity, so the rate of photosynthesis is decreased. There is an \(\boldsymbol{\text{optimal}}\) temperature at which the enzymes work at their best.