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प्रश्न
A healthy croton plant bearing variegated leaves was kept in a dark cupboard to destarch it after which it was placed in sunlight for a few hours. One of the leaves was then plucked and an outline of the leaf marking the green and the non-green regions was drawn. The leaf was then tested for starch. Using the above information, answer the following questions:
- State the aim of the above experiment.
- Name the chemical used for testing the presence of starch.
- Why is the leaf boiled in water and alcohol before testing for the presence of starch?
- What change is seen on the leaf after the starch test?
- Give the chemical equation to represent the process of starch formation in plants.
उत्तर
- Chlorophyll is necessary for photosynthesis.
- Iodine solution.
- the leaf is boiled in water to kill the cells and boiled in alcohol to remove chlorophyll.
- The green parts of the leaf turned blue-black while non-green parts turned brown.
- \[\ce{6CO2 + 12H2O->[Light energy][ChlorophyII]C6H12O6 + 6H2O + 6O2 ^}\]
APPEARS IN
संबंधित प्रश्न
The solvent used to dissolve the chlorophyll pigments while testing a leaf for starch is Soda lime.
Put a tick (✓ ) against the most appropriate alternative in the following statement.
Carbohydrates are stored by plants in the form of:
(i) Fill in the blanks in the following equations of two chemical reactions:
(a) \[\ce{---+12H2O->[Light energy]C6H12O6 + --- + ----}\]
(b) \[\ce{--- 6O2->[Chlorophyll] 6 --- +6 ---- + Energy}\]
(ii) Name the two processes represented by the above two reactions.
(iii) State any two differences in these processes other than those already indicated in the reactions.
(iv) Which one of these two reactions is the supporter of all life on earth?
A potted destarched plant was taken in order to prove that light is necessary for photosynthesis.
(i) What is meant by 'destarched plant'? How can it be destarched?
(ii) Using the destarched plant describe step by step how you would proceed to prove that in the absence of light the leaf cannot manufacture starch.
A leaf is a food factory. Explain.
Using the destarched plant describe step by step how would you proceed to prove that in the absence of light the leaf cannot manufacture starch?
State whether true or false. If false, correct the statement.
Photosynthesis produces glucose and carbon dioxide.
The reactions of photosynthesis make up a biochemical pathway.
Explain how the biochemical pathway of photosynthesis recycles many of its own reactions and identify the recycled reactants.
Can the stem of a plant be compared with a street with two-way traffic? Give reason.
The raw material which is reduced during photosynthesis is ______.
