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प्रश्न
Complete the following paragraph by filling in the blank (1) to (5) with appropriate words:
To test a leaf for starch, the leaf is boiled in water to (1) _________. It is then boiled in Methylated spirit to (2) ________. The leaf is dipped in warm water to soften it. It is placed in a petri dish, and (3) _____ solution is added. The region of the leaf which contains starch, turns (4) ________and the region while does not contain starch, turns (5) __________.
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उत्तर
1) to kill the cells
2) remove the chlorophyll
3) Iodine solution
4) blue-black in colour
5) brown
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संबंधित प्रश्न
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.
- What will you observe in the experimental leaf after the starch test?
- Explain the process of photosynthesis.
- Give a balanced chemical equation to represent the process of photosynthesis.
- Draw a neat, labelled diagram of an experimental setup to show that oxygen is released during photosynthesis.
Fig. represents the vertical section of a leaf.
- Name the parts labelled 1 to 5.
- What do the two arrows (dotted and solid) indicate in the daytime and at night?
- Could you add one more arrow in the figure? If yes, what for?
Which one chemical reaction occurs during photosynthesis?
"Oxygen is a waste product of photosynthesis." Comment.
Complete the following food chains by writing the names of appropriate organisms in the blanks:
______ → Mouse ______ → Peacock
Give technical term:
In photosynthesis radiant energy is converted into which from?
Complete the following sentence with appropriate word:
AIIP stands for ____________.
Complete the following sentence with appropriate word:
Xanthophyll is ______ coloured pigment.
During photosynthesis, ________ is produced and stored in the leaf.
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.
