Photosynthesis Process and Testing Starch Quiz

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Questions and Answers

What is the equation for photosynthesis?

6CO2 + 6H2O + light energy → C6H12O6 + 6O2

How can we test if a plant has carried out photosynthesis?

By testing for starch, which is produced during photosynthesis and stored in leaves

What turns dark blue/black in the presence of starch?

Iodine

What is one of the by-products of photosynthesis?

Oxygen Signup and view all the answers

How is oxygen collected and tested in an experiment to determine if a water plant has carried out photosynthesis?

Gas is collected in a test tube containing sodium hydrogencarbonate solution and tested with a glowing splint Signup and view all the answers

How do plants gain mass and weight?

Plants gain mass and weight from absorbing water and minerals from the soil through their roots, and energy from sunlight through their leaves during photosynthesis Signup and view all the answers

What did an experiment using a Coleus plant with variegated leaves indicate about chlorophyll and photosynthesis?

Only the green parts of leaves containing chlorophyll contained starch after an iodine test Signup and view all the answers

What did an experiment wrapping some leaves of a plant in aluminum foil and leaving others uncovered show about photosynthesis?

Only uncovered leaves contained starch after 2 days Signup and view all the answers

Why is photosynthesis important for both plants and animals?

Animals cannot produce their own food and rely on plants or other animals for food either directly or indirectly through food chains Signup and view all the answers

What is the first link in a food chain?

Producers like plants Signup and view all the answers

What role do decomposers like fungi and bacteria play in an ecosystem?

Break down dead or waste organic materials and return nutrients to the soil/environment for reuse by plants Signup and view all the answers

What impact do disruptions in a food web have on an ecosystem?

Disruptions can impact the whole ecosystem Signup and view all the answers

What are the steps to test for starch using iodine solution?

<ol> <li>Prepare the materials needed 2. Add a drop of iodine solution to a Petri dish as a control and record the color 3. Add a drop of starch solution and a drop of water to separate parts of another Petri dish 4. Add a drop of iodine solution to the starch solution and to the water separately 5. Observe and record any changes in color 6. Destarch the leaf sample by keeping it in darkness for 1-2 days</li> </ol> Signup and view all the answers

What are primary, secondary, and tertiary consumers based on?

What they feed on Signup and view all the answers

How do respiration and photosynthesis affect atmospheric oxygen and carbon dioxide levels?

Respiration releases CO2 while photosynthesis absorbs it, maintaining balance Signup and view all the answers

What is the purpose of keeping a leaf sample in darkness for 1-2 days before testing for starch?

To destarch the leaf sample Signup and view all the answers

What do food chains show?

The transfer of energy from producers to consumers Signup and view all the answers

What is the purpose of a food web?

To show the interconnected food chains in an ecosystem and energy transfer between organisms Signup and view all the answers

Study Notes

Photosynthesis and Plants

The equation for photosynthesis is not specified in this text, but it is typically 6CO2 + 6H2O + light energy → C6H12O6 (glucose) + 6O2
To test if a plant has carried out photosynthesis, starch production can be checked, as it is a by-product of photosynthesis
Iodine solution turns dark blue/black in the presence of starch

Testing for Photosynthesis

Oxygen is a by-product of photosynthesis, and can be collected and tested in an experiment using a gas syringe or a bell jar
To determine if a water plant has carried out photosynthesis, oxygen production can be measured using a gas syringe or a bell jar

Plant Growth and Development

Plants gain mass and weight through photosynthesis, which produces glucose that provides energy for growth and development
Chlorophyll is necessary for photosynthesis, as indicated by an experiment using a Coleus plant with variegated leaves
Chlorophyll is present in the green areas of the leaves, which are capable of undergoing photosynthesis

Importance of Photosynthesis

Photosynthesis is important for both plants and animals, as it provides energy and organic compounds for food chains
The first link in a food chain is typically a producer, such as a plant that undergoes photosynthesis
Decomposers like fungi and bacteria play a crucial role in an ecosystem by breaking down dead organic matter and recycling nutrients

Food Chains and Webs

Primary consumers feed on producers, secondary consumers feed on primary consumers, and tertiary consumers feed on secondary consumers
Disruptions in a food web can have a ripple effect throughout the ecosystem
Food chains show the feeding relationships between organisms in an ecosystem
A food web is a network of interconnected food chains

Testing for Starch

To test for starch, a leaf sample is boiled in water to break down cell membranes, then treated with iodine solution, which turns dark blue/black in the presence of starch
The purpose of keeping a leaf sample in darkness for 1-2 days before testing for starch is to deplete the leaf of starch, ensuring that any starch present after the test period is a result of photosynthesis

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Description

Learn about the process of photosynthesis and how to test for the presence of starch in plants. Explore the word equation and chemical equation for photosynthesis, as well as the by-product of oxygen. Test your knowledge with this quiz!