Advertisements
Advertisements
Question
An experiment was set up as shown in the figure given below . The twig in the diagram was intact on the plant and it was as such in sunlight for a few hours .
(i) What is the aim of the above experiment ?
(ii) Why was potassium hydroxide placed inside the conical flask ?
(iii) What test would you perform on the leaf inside the flask?
(iv) What is the expected result of the above test ?
(v) Is it necessary to similarly test on outer leaf also ? Giva a reason .
Solution
(i) The aim of the experiment is to prove that CO2 is necessary for photosynthesis.
(ii) Potassium hydroxide absorbs CO2 from the surrounding. It is placed to remove CO2 within the conical flask.
(iii) The leaf inside the conical flask would be tested for the presence of starch by the application of iodine.
(iv) The expected result of the above test is - No change in the colour will be observed.
(v) Yes, it is necessary to similarly test on the outer leaf also to show that leaves present in CO2 show photosynthesis.
APPEARS IN
RELATED QUESTIONS
Two healthy green plants were placed in the dark for 24 hours. They were then set up, as shown in the figure, for 4 hours. Then a leaf was taken from each plant and
the chlorophyll was removed from the leaves:
( i) What is the next and final step in this experiment?
( ii ) What would be the results of the final step?
( iii ) Why was it necessary to grease the glass sheet?
( iv ) What hypothesis is being tested in this experiment?
How would you demonstrate that green plants release oxygen when exposed to light?
Complete the following by filling the blanks 1 to 5 with appropriate words/terms/phrases:
To test the leaf for starch, the leaf is boiled in water to ______ (1). It is next boiled in methylated spirit to ______ (2). The leaf is placed in warm water to soften it. It is then placed in a dish and ______ (3) solution is added. The region which contains starch, turns ______ (4) and the region which does not contain starch, turns ______ (5)
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 Guard cells.
Given alongside is the diagram of an experimental set-up:
Would you take any step before starting the experiment? Describe this step and explain its necessity.
Where are the chlorophyll pigments present in a cell?
Chloroplasts are called energy converters.
Give technical term:
Name the experiment to demonstrate the importance of light for photosynthesis.
Write the overall chemical equation for photosynthesis.
