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Experiments Conducted to Prove the Formation of Starch in Plants

In the experi...

Question

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

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Solution

The correct sequence of steps for the above mentioned experiment is II - III - I.

II. Chlorophyll is dissolved in ethanol
III. Hot water makes leaf tissue soft
I. Starch reacts with iodine and gives blue-black colour

Hence, the correct answer is option 2.

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Similar questions

Q. 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 :
(1) I, III, IV, II
(2) I, IV, III, II
(3) II, IV, III, I
(4) II, III, I, IV

Q. 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?

(1) I only
(2) II only
(3) I and III
(4) II and III

Q. The following figures illustrate the binary fission in Amoeba in an incorrect sequence :

The correct sequence is :

(1) I, III, IV, II
(2) II, III, IV, I
(3) IV, III, II, I
(4) III, IV, II, I

Which option correctly fills up the blanks in the following equation?

$(i) + W a t e r S u n l i g h t + (i i) - ------- \to G l u c o s e + (i i i)$

F e C r_{2} O_{4}

(chromite) is converted to

C r

by following steps :
Chromite

I \to

N a C r O_{4}

I I - \to

C r_{2} O_{3}

I I I - - \to

C r

Reagents in I, II and III might be :
I- Step II-Step III-Step

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Experiments Conducted to Prove the Formation of Starch in Plants

Standard XII Biology

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