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Hydrilla plant is used in an experiment to test that

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Important Questions on Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.

HARD
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

A potted plant with variegated leaves was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours and then placed in bright sunlight for a few hours. Observe the diagrams and answer the questions:

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(i) What aspect of photosynthesis is being tested in the above diagram?

(ii) Represent the process of photosynthesis in the form of a balanced equation.

(iii) Why was the plant kept in the dark before beginning the experiment?

(iv) What will be the result of the test performed on leaf ‘A’ shown in the diagram ? Give an example of a plant with variegated leaves.

(v) Draw a neat labelled diagram of a chloroplast.

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow:

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What will you observe when the leaf A is tested for starch?

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow:

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Explain the term Photosynthesis.

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

Name the green dots contained by the leaves. What function do they perform?

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the following question

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Give a balanced chemical equation to represent the process of photosynthesis.

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

 What precautions do you take while conducting an experiment on root pressure?

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow:

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Write a well-balanced chemical equation for the process of photosynthesis.

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow:

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What is the purpose of keeping KOH in the flask?

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the following question

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Draw a neat, labelled diagram of an experimental setup to show that oxygen is released during photosynthesis.

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow:

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Which factor is being studied here?

HARD
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the following question

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Name the factor studied in this experiment.

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the following question

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Explain the process of Photosynthesis.

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the following question

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What will you observe in the experimental leaf after the starch test?

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

Two potted plants are destarched by keeping them in dark for 48 hrs and then set up as shown in the below diagrams A and B. The bell jars are made airtight by putting vaseline at the bottom. They are kept in bright sunlight for 8-10 hrs and tested for starch.

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Why are the plants destarched?

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

The figure below represents an experiment performed to demonstrate a particular aspect of photosynthesis. The apparatus was kept in sunlight for almost the whole day. The numeral 1 represents a certain condition inside the flask and numeral 2 represents a chemical responsible for this condition.
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What is the object of this experiment?

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

Two potted plants are destarched by keeping them in dark for 48 hrs and then set up as shown in the below diagrams A and B. The bell jars are made airtight by- putting vaseline at the bottom. They' are kept in bright sunlight for 8-10 hrs and tested for starch.

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Why is KOH not kept in jar B?

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

The diagram below illustrates iodine test for the presence of starch in a leaf.

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Why is the leaf again boiled in hot water?

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

What would be the next and final step in this experiment?

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MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

The figure below represents an experiment performed to demonstrate a particular aspect of photosynthesis. The apparatus was kept in sunlight for almost the whole day. The numeral 1 represents a certain condition inside the flask and numeral 2 represents a chemical responsible for this condition.

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Write the overall chemical equation for the process of respiration.

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.>Organization for Matter and Energy Flow in Organisms - Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.

The diagram below illustrates iodine test for the presence of starch in a leaf.

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Why is the leaf boiled in water for few minutes?