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प्रश्न
Write an experiment to demonstrate that CO2 is necessary for photosynthesis.
उत्तर
Take a destarched plant. Insert one of its leaves in a conical flask, which contains potassium hydroxide. Leave it in the sunlight. After a few hours, test this and any other leaf of this plant for starch. The leaf which was exposed to the atmospheric air becomes blue-black, and the one in the flask containing KOH does not become blue-black after the iodine test. The experiment showing that CO2 is necessary for photosynthesis.
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संबंधित प्रश्न
The figure given below represents an experimental setup with a weighing machine to demonstrate a particular process in plants. The experimental setup was placed in bright sunlight. Study the diagram and answer the following questions:
(i) Name the process intended for study.
(ii) Define the above mentioned process.
(iii) When the weight of the test tube (A & B) is taken before and after the experiment, what is observed? Give reasons to justify your observation in A & B.
(iv) What is the purpose of keeping the test tube B in the experimental setup?
Give biological explanations for Plants growing in fertilized soil are often found to wilt if the soil is not adequately watered.
Give suitable biological reasons for the following statement :
All life on Earth is supported by Photosynthesis.
Given below is an experiment setup to demonstrate a particualr tropic movement in germinating seeds. Study the diagram and answer the questions that follow : 
Label the parts 1 and 2.
The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow : 
Name the factor studied in this experiment.
Define the following:
Quantum
Mention any two points in which photosynthesis and respiration in plants are opposite to each other.
Choose the correct answer:
In a typical leaf, photosynthesis occurs mainly in ___________
The rate of photosynthesis is not affected by
Name the following:
The category of organisms that prepare their own food from basic raw materials.
Identify the false statements and rewrite them correctly by changing the first or last word only.
Algae are autotrophs.
Photosynthesis in green plants is directly and indirectly dependent on so many plant structures.
Explain briefly the role of the following structures in this process is Phloem tissue in the leaf veins.
Explain, why respiration is said to be a reversed process of photosynthesis?
All life on earth Would come to an end if there were no green plants.
Explain the Term Free Energy.
Give technical term:
Organisms which cannot prepare their own food by photosynthesis.
Higher Order Thinking Skill.
Imagine that student A studied the importance of certain factors in photosynthesis. He took a potted plant and kept it in dark for 24 hours. In the early hours of the next morning, he covered one of the leaves with dark paper in the centre only. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch.
- What aspect of photosynthesis was being investigated?
- Why was the plant kept in the dark before the experiment?
- How will you prove that starch is present in the leaves?
- Name the raw materials needed for photosynthesis.
Oxygen is produced at what point during photosynthesis?
Where does the carbon that is used in photosynthesis come from?
