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 making the green and non-green regions were drawn. The leaf was then tested for starch. Using the above information, answer the following question

Give the chemical equation to represent the process of starch formation in plants.

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Solution

6CO $_{2}$ + 12H $_{2}$ O $\to$ C $_{6}$ H $_{1}$ $_{2}$ O $_{6}$ + 6H $_{2}$ O + 6O $_{2}$

Generally

n(C $_{6}$ H $_{1}$ $_{2}$ O $_{6}$ ) $\to$ (C $_{6}$ H $_{1}$ $_{0}$ O $_{5}$ )n + nH $_{2}$ O

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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 making the green and non-green regions were drawn. The leaf was then tested for starch. Using the above information, answer the following question

Name the chemical used for testing the presence of starch

Q. A portion of destarched leaf of a potted plant was covered with a black strip of paper. The plant was exposed to sunlight for six hours and then tested for starch. It was observed that :

A potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre. The potted plant was then placed in sunlight for a few hours.

(a) What aspect of photosynthesis was being tested ?

(b) Why was the plant placed in the dark before beginning the experiment ?

(1) boiled in water (2) boiled in methylated spirit.

(d) Write a balanced chemical equation to represent the process of photosynthesis.

(e) Draw a neat diagram of a chloroplast and label its parts.

Two healthy green plants were placed in the dark for 24 hours. They were then set up as shown in the figure and were left for 4 hours. Then a leaf was taken from each plant and the chlorophyll was removed from the leaves.

What hypothesis is being tested in this experiment?

Q. A potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre. The potted plant was then placed in sunlight for a few hours.
During the starch test why was the leaf -
(1) boiled in water
(2) boiled in methylated spirit.

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6CO2 + 12H2O → C6H12O6 + 6H2O + 6O2Generallyn(C6H12O6) → (C6H10O5)n + nH2O

6CO $_{2}$ + 12H $_{2}$ O $\to$ C $_{6}$ H $_{1}$ $_{2}$ O $_{6}$ + 6H $_{2}$ O + 6O $_{2}$

Generally

n(C $_{6}$ H $_{1}$ $_{2}$ O $_{6}$ ) $\to$ (C $_{6}$ H $_{1}$ $_{0}$ O $_{5}$ )n + nH $_{2}$ O