What is the role of KOH in this experiment? The KOH binds with the CO2 and forms a solid at the bottom of the vial, allowing us to accurately measure the oxygen consumption without the release of carbon dioxide interfering.

Then, Why do germinated seeds respire more?

When a plant germinates it is at the early stages in its “life” and growth. Germinating seeds are used in the experiment because germinating plants respire a lot more than a plant that has already grown, this is because the new plants require more energy and oxygen to get started.

Considering this, How do Respirometers work? How the Respirometer Works. When the tip of the respirometer is submerged, no additional air will enter. As O2 is used up, the pressure of gases inside the respirometer decreases. Notice that as the gas volume inside the vial decreases, the pressure of water outside the vial forces water into the pipette.


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What is the rate of oxygen consumed by germinating peas?

According to experimental data, the germinating peas consumed significantly lot more oxygen compared to the non-germinating peas. The germinating peas showed nearly an oxygen consumption rate of almost 0.0825mL/minute (Figure 1.0).

Why do germinating peas consume more oxygen?

Germinating pea seeds require more energy to grow which allow them to have a high rate of respiration to take in more oxygen compared to a non-germinating pea seed, which is dormant. When the temperature of its surround is increased, the pea consumes more oxygen because warmer temperature increases enzyme activities.

What is the process of aerobic respiration?

Aerobic respiration is the process of producing cellular energy involving oxygen. Cells break down food in the mitochondria in a long, multistep process that produces roughly 36 ATP. Aerobic respiration is the process of breaking down the food that comes into a cell using oxygen to help power that process.

Why does cellular respiration increase with temperature?

The increase in temperature enhances the rate of cellular respiration. It is due to the heat speeds up the reactions, means the kinetic energy is higher. It means reactions speed up and rate of cellular respiration increases. When temperature decreases, in order to conserve energy, cellular processes slow.

Why do germinated peas undergo cell respiration?

The food stored in the seed provides the pea plant cells with the energy they need to maintain themselves and divide, since the plant is not yet capturing sunlight through photosynthesis. The pea plant cells depend on cellular respiration to furnish them with the energy they need to stay alive and grow.

How does body size affect the rate of respiration?

Respiration should generally increase with body mass, as larger organisms need more energy; thus, b is usually positive but is commonly less then 1, meaning that while larger animals use overall more oxygen per individual than small animals they use less oxygen per unit body mass.

Why is it necessary to correct the pea readings with the bead readings?

The oxygen consumption increased over time in the germinating peas. Why is it necessary to correct the readings from the peas with the readings from the beads? This is necessary to show the actual rate at which cellular respiration occurs in peas. The beads served as a control variable.

What is the role of KOH in the cellular respiration experiment quizlet?

Advantages of Aerobic Respiration

This releases only enough energy to make two ATP molecules. With oxygen, organisms can break down glucose all the way to carbon dioxide. This releases enough energy to produce up to 38 ATP molecules.

What was the purpose of the beads?

Beads are used for religious purposes, as good luck talismans, for barter, and as curative agents.

Why do germinating peas produce carbon dioxide?

To fulfill the high-energy needs of a germinating seedling, cellular respiration increases as a seed emerges from dormancy and begins germinating. As the seeds respire, they are taking in oxygen and respiring out carbon dioxide, but the carbon dioxide is absorbed by the calcium hydroxide.

What does a Respirometer measure?

A respirometer is a device used to measure the rate of respiration of a living organism by measuring its rate of exchange of oxygen and/or carbon dioxide.

What affects cellular respiration?

We’ll first review what cellular respiration is, and then explore how three factors affect it: temperature, glucose availability, and oxygen concentration.

Why did the vial have to be completely sealed?

What is the difference between germinating and Nongerminating peas?

Germination is the growth processes of a seed. It requires a lot of energy to break the seed coat and as it continues to grow this energy need increases. Non-germinating seeds, however, are dormant and use very little respiration. Some respiration must occur in order for the seed to live.

Do seeds do cellular respiration?

Seeds don’t breathe in the same way mammals do. Instead, they breathe at a cellular level. In cellular respiration, the seed uses stored sugars, water and oxygen to burn energy at a cellular level and germinate, or sprout.

What was used as a measure of the rate of respiration in the lab?

In this experiment, an apparatus called a respirometer is used. A respirometer is a tool used to observe exactly how much oxygen was consumed by the peas and the glass beads.

What are the main events of glycolysis How is ATP formed?

Aerobic (“oxygen-using”) respiration occurs in three stages: glycolysis, the Krebs cycle, and electron transport. In glycolysis, glucose is split into two molecules of pyruvate. This results in a net gain of two ATP molecules. Life first evolved in the absence of oxygen, and glycolysis does not require oxygen.

How does temperature affect cellular respiration?

The increase in temperature enhances the rate of cellular respiration. It is due to the heat speeds up the reactions, means the kinetic energy is higher. It means reactions speed up and rate of cellular respiration increases. When temperature decreases, in order to conserve energy, cellular processes slow.

What does cellular respiration produce?

Most of the steps of cellular respiration take place in the mitochondria. Oxygen and glucose are both reactants in the process of cellular respiration. The main product of cellular respiration is ATP; waste products include carbon dioxide and water.

What is the role of KOH in the cellular respiration experiment quizlet?

One complete breath comprises one inhalation, when the chest rises, followed by one exhalation, when the chest falls. To measure the respiratory rate, count the number of breaths for an entire minute or count for 30 seconds and multiply that number by two. .

Why do germinated peas consume more oxygen?

Now, regarding the glass beads—the purpose of this part of the experiment is to account for any pressure changes in our respirometers, which are due to factors other than pea respiration. We subtract these pressure changes from those observed in the other respirometers in order to get the CORRECTED PRESSURE DIFFERENCE.

Why will we be using vials with glass beads only?

The vial with glass beads alone will permit detection of any changes in volume due to atmospheric pressure changes or temperature changes. As oxygen is used up by the respiring seeds, the gas pressure inside the respirometer will decrease and the water will flow into the pipet down its pressure gradient.

What is the difference between germinating and Nongerminating seeds?

It requires a lot of energy to break the seed coat and as it continues to grow this energy need increases. Respiration is required to access this energy so as the seed germinates its respiration rates increase. Non-germinating seeds, however, are dormant and use very little respiration.

What is the difference between germinating and Nongerminating seeds?

a. KOH Takes up carbon dioxide given off by cellular respiration. The carbon dioxide given off in vial 1 will obscure the uptake of oxygen in that vial. Soybeans don’t move as animals do.

Are non germinating peas alive?

The nongerminating peas consumed far less oxygen than the germinating peas. This is because, though germinating and nongerminating peas are both alive, germinating peas require a larger amount of oxygen to be consumed so that the seed will continue to grow and survive.

What is the equation for cellular respiration?

C 6 H 12 O 6 + 6 O 2 –> 6 CO 2 + 6 H 2 O + ATP is the complete balanced chemical formula for cellular respiration.

What is fermentation and what are the two types?

The two most common types of fermentation are (1) alcoholic fermentation and (2) lactic acid fermentation. (1) Alcoholic fermentation : the type of fermentation in which ethyl alcohol is the main end product . This is very common in yeast (unicellular fungus) and also seen in some bacteria.

How are fermentation and cellular respiration similar?

~ Fermentation and cellular respiration are alike in that they both begin with a series of reactions known as glycolysis, which breaks glucose molecules into smaller pyruvate molecules. ~ Fermentation and cellular respiration differ in that fermentation does not require oxygen while cellular respiration does.

What is the purpose of the beads in Lab 5?

C 6 H 12 O 6 + 6 O 2 –> 6 CO 2 + 6 H 2 O + ATP is the complete balanced chemical formula for cellular respiration.

What is the purpose of cellular respiration?

The Purpose Cellular Respiration

Cellular respiration is the process by which cells in plants and animals break down sugar and turn it into energy, which is then used to perform work at the cellular level. The purpose of cellular respiration is simple: it provides cells with the energy they need to function.

Why is it important to use germinated seeds without leaves?

Now, regarding the glass beads—the purpose of this part of the experiment is to account for any pressure changes in our respirometers, which are due to factors other than pea respiration. We subtract these pressure changes from those observed in the other respirometers in order to get the CORRECTED PRESSURE DIFFERENCE.