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In the experiment to show that light is ...

In the experiment to show that light is necessary for photosynthesis, some of the steps of the experiment deal with the following activites:
I. Starch reacts with iodine and gives blue-black colour
II. Chlorophyll is dissolved in ethanol
III.Hot water makes leaf tissue soft ltbgt The correct sequence of these steps is:

A

`I-II-III`

B

`II-III-I`

C

`III-II-I`

D

`I-III-II`

Text Solution

Verified by Experts

The correct Answer is:
B
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When asked to set up an experiment to show that 'light is necessary for photosynthesis', a student ran to the school garden and set up the experiment by using a plant growing in the school garden. The experiment failed. His classmates made the following suggestions to get success in the experiment: Student A: Safranin should be used instead of iodine Student B: The leaf should not be boiled in alcohol to remove chlorophyll before testing for starch Student C: Transparent paper should be used instead of black paper strip Student D: The leaf should be destarched before before starting the experiment The correct suggestion is given by:

The steps necessary for setting up the experiment, 'To demonstrate that light is necessary for photosynthesis' are not given here in proper sequence: I. Keep the potted plant in sunlight for 3 to 4 hours. II. Keep the potted plant in darkness for about 48 hours. III. Cover a leaf of the plant with a strip of black paper. IV. Pluck the leaf and test it for starch. The correct sequence of steps is:

The steps taken for setting up an experiment to demonstrate that 'light is necessary for photosynthesis', were as follows: * A strip of black paper was clipped on the leaf of a potted plant * The plant was kept in the sun for four hours * The strip was removed and the leaf was placed in boiling alcohol in a water bath * The leaf was washed and tested for starch The result was not as expected. Identify the step which had been missed out:

Out of the following figures, choose the one showing the correct procedure for removing chlorophyll from the leaf in the experiment 'light is necessary for photosynthesis': The correct procedure is:

Given alongside is a sketch of a leaf partially covered with black paper and which is to be used in the experiment to show that light is compulsory for the process of photosynthesis. At the end of the experiment, which one of the leaf parts labelled I, II and III will become blue black when dipped in iodine solution?

The steps involved in making a slide of epidermal peel of leaf are given as follows: I. Pull out a thin peel from the lower surface of the leaf II. Place a drop of glycerine on the slide III. Stain the peel in safranin IV. Place the stained peel on the glycerine V. Remove the extra stain by washing with water VI. Place the coverslip over the peel Which one is the correct sequence on steps to be followed?

LAKHMIR SINGH & MANJIT KAUR-MCQ SECTION-Exercise
  1. On completion of the experiment to demonstrate that 'Light is necessar...

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  2. In the experiment to show that light is necessary for photosynthesis, ...

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  3. In the experiment to show that light is necessary for photosynthesis, ...

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  4. A portion of each of four destarched leaves of a plant was covered wit...

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  5. In order to destarch the leaves for an experiment to show that sunligh...

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  6. Which one of the following is the correct combination of relevant mate...

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  7. A protion of destarched leaf of a potted plant was covered with a bla...

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  8. A star-shaped figure was cut in the black paper strip used for coveri...

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  9. In an experiment to test the presence of starch in a leaf, the leaf is...

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  10. For the experiment 'Light is necessary for photosynthesis', the potted...

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  11. When asked to set up an experiment to show that 'light is necessary fo...

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  12. The steps taken for setting up an experiment to demonstrate that 'ligh...

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  13. Out of the following figures, choose the one showing the correct proce...

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  14. A leaf of destarched healthy potted plant was covered by black paper s...

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  15. In an experiment to test the presence of starch in a leaf, the plucked...

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  16. Why is some KOH placed in a small test tube in the flask with germina...

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  17. Which one of the following is the correct set of three precautions for...

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  18. The experimental set up shown here to demonstrate thet 'CO(2) is given...

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  19. The following experimental set-ups were kept in the laboratory to show...

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  20. In the experiment to show that CO(2) is given out during respiration b...

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