Asked by: Salvadora Awdiewsky
Asked in category: science, chemistry, science, chemistry, science, chemistry, science, chemistry
Last Updated: 8th Jul 2024

What is the Pondweed Experiment?

This practical experiment measures the rate of photosynthesis by counting the bubbles that rise from the cut end a Cabomba pondweed. This method is more reliable than the Elodea pondweed.
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Another question is: Why is pondweed being used in photosynthesis experiments

The carbon dioxide in pond weed is dissolved in its water. You can adjust the amount of dissolved carbon dioxide by adding sodium hydrogen carbonate to the water. Water used for photosynthesis is water already in the plant.

How can you measure photosynthesis rate in pondweeds? You can measure photosynthesis by measuring the production of oxygen Oxygen by counting the bubbles from pondweed or using the Audus apparatus for measuring the amount of gas that has evolved over time.

Similar question: What is the independent variable of the pondweed experiment, too?

Independent variable - The light intensity (how close to the sun is). Dependant variable- The number of oxygen bubbles released (the rate photosynthesis). Variables that can be controlled - the size and volume of the pondweed as well as the water it is boiled in, its temperature, and the water's temperature.

What does the light do to photosynthesis?

An aquatic organism can be used to study the effect of light intensity on photosynthesis. In water plants, investigation can show the effect of high lighting on photosynthesis. You can use Elodea or Cabomba which can be purchased in aquarium shops. Photosynthesis is a process in which plants release oxygen bubbles, which can be counted.

17 Related Question Answers Found

What type of reaction is photosynthesis?

endothermic reaction

How do plants use glucose?

During photosynthesis, plants trap light energy with their leaves. Plants use the energy of the sun to change water and carbon dioxide into a sugar called glucose. Glucose is used by plants for energy and to make other substances like cellulose and starch.

What is photosynthetic rate?

Photosynthetic capacity (Amax) is a measure of the maximum rate at which leaves are able to fix carbon during photosynthesis. It is typically measured as the amount of carbon dioxide that is fixed per metre squared per second, for example as μmol m−2 sec−1.

Does sodium bicarbonate absorb oxygen?

A Amount of oxygen evolved decreases as carbon dioxide in water is absorbed by sodium bicarbonate. C Amount of oxygen evolved increases as the availability of carbon dioxide increases. D Amount of oxygen evolved increases as carbon dioxide in water is absorbed by sodium bicarbonate.

Does Hydrilla produce oxygen?

Hydrilla, like all plants, gives off CO2 and uses oxygen during the night time (although the opposite is true during the day), which can bring oxygen levels to dangerously low levels for fish.

What gas is used during photosynthesis?

carbon dioxide gas

What is audus apparatus?

The Audus apparatus (sometimes referred to as the photosynthesis apparatus) is normally used at AS/A2 level to estimate the rate of photosynthis in terms of the rate of evolution of gas by a suitable aquatic plant such as cambodia or elodea sp.

How do plants get energy?

Plant cells obtain energy through a process called photosynthesis. This process uses solar energy to convert carbon dioxide and water into energy in the form of carbohydrates. Secondly, that energy is used to break down carbon dioxide and form glucose, the main energy molecule in plants.

What is the aim of photosynthesis experiment?

The aim of this experiment is to investigate the factors affecting photosynthesis in Elodea. Photosynthesis The aim of this experiment is to investigate the factors affecting photosynthesis in Elodea. Plants photosynthesise in order to produce energy, in the form of glucose, from sunlight.

Why was sodium bicarbonate nahco3 added to the solution?

When sodium bicarbonate is added to the water, the bicarbonate ion acts as a carbon source for photosynthesis causing the leaf disks to sink. As photosynthesis proceeds, oxygen is released into the interior of the leaf, which changes its buoyancy causing the disk to rise.

What would happen to the number of bubbles if the plant was placed in the dark?

Plant cells respire in the light and the dark, releasing carbon dioxide. In the light, photosynthesis can also happen, and carbon dioxide is absorbed from the air. If the light is bright enough, the rate of absorption becomes greater than the rate of release.

What is a controlled experiment in biology?

Controlled Experiment Definition. A controlled experiment is a scientific test that is directly manipulated by a scientist, in order to test a single variable at a time. The variable being tested is the independent variable, and is adjusted to see the effects on the system being studied.

What is a controlled variable in science?

A control variable (or scientific constant) in scientific experimentation is an experimental element which is constant and unchanged throughout the course of the investigation. The control variables themselves are not of primary interest to the experimenter.

How does temperature affect photosynthesis experiment?

The temperature does increase the rate of photosynthesis up to 45°C. After the optimum point, the rate begins to decrease due to the denaturing of the enzymes(as they are proteins they denature in 40 °C) , causing fewer collisions between the enzyme and its substrate.

Why is it important that the LED light source does not get hot?

In one sense this is true: LEDs are cool to the touch because they generally don't produce heat in the form of infrared (IR) radiation (unless of course they are IR LEDs). IR radiation heats the enclosures and surroundings of incandescent bulbs and other sources, making them hot to the touch.

Why is sodium hydrogen carbonate solution used instead of water?

1. Why is sodium hydrogen carbonate solution used instead of water? Sodium hydrogencarbonate increases carbon dioxide availability, and ensures that carbon dioxide is not a limiting factor for the the reaction. Plain water water may not contain enough oxygen so that the maximum rate of photosynthesis can occur.

Why do we use sodium bicarbonate in photosynthesis experiment?

The function of the sodium bicarbonate in this experiment, was providing carbon dioxide for photosynthesis to occur. Light independent reactions take part in the stroma. For photosynthesis to happen for a light independent reaction, carbon dioxide needs to enter the plant.
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