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Question
A potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre.The potted plant was then placed in sunlight for a few hours.
- What aspect of photosynthesis was being tested?
- Why was the plant placed in the dark before beginning the experiment?
- During the starch test why was the leaf
- boiled in water
- boiled in methylated spirit
- Write a balanced chemical equation to represent the process of photosynthesis.
- Draw a neat diagram of a chloroplast and label its parts.
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Solution
- Light is required for photosynthesis.
- Before beginning the experiment, the plant was kept in the dark in order to destarch it, i.e. to remove the pre-existing starch from the storage organs.
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- The leaf was boiled in water to destroy enzymes so that further chemical changes do not take place in the leaf.
- The leaf was boiled in methylated spirit to dissolve chlorophyll.
- Chemical equation for the process of photosynthesis:
\[\ce{6CO2 + 12H2O ->[Light][Chlorophyll] C6H12O6 + 6O2 + 6H2O}\] 
RELATED QUESTIONS
The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow :
What will you observe in the experimental leaf after the starch test?
Which one chemical reaction occurs during photosynthesis?
Name the following:
The tissue that transports manufactured type of starch from leaves to all parts of the plants.
Give technical term:
Name the tissue that transports manufactured starch from the leaves to all parts of the plant.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Land plants obtain their CO2 from the atmosphere.
Answer the following question.
Explain why photosynthesis is considered the most important process in the biosphere.
During photosynthesis, ________ is produced and stored in the leaf.
Gas exchange takes place in plants using _____.
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.
In leaves, the food is stored in the form of ______.
