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Solved 2019 Question Paper ICSE Class 10 Biology — Question 3

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Question 3(a)

The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow : [5]

The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow. Name the factor studied in this experiment. What will you observe in the experimental leaf after the starch test? Explain the process of Photosynthesis. Give a balanced chemical equation to represent the process of photosynthesis. Draw a neat, labelled diagram of an experimental setup to show that oxygen is released during photosynthesis. ICSE 2019 Biology Solved Question Paper.

(i) Name the factor studied in this experiment.

(ii) What will you observe in the experimental leaf after the starch test?

(iii) Explain the process of Photosynthesis.

(iv) Give a balanced chemical equation to represent the process of photosynthesis.

(v) Draw a neat, labelled diagram of an experimental setup to show that oxygen is released during photosynthesis.

Answer

(i) The factor studied in this experiment is Sunlight.

(ii) It will be observed that only the parts of the leaf which could get sunlight turn blue black and the parts which were covered with black paper do not turn blue as they could not synthesize starch.

(iii) Photosynthesis is the process by which living plant cells, containing chlorophyll, produce food substances(glucose and starch), from carbon dioxide and water, by using light energy. Plants release oxygen as a by-product during photosynthesis.

(iv) Balanced chemical equation representing the process of photosynthesis is given below:

6CO2+12H2O  ⟶chlorophylllight energy  C6H12O6+6H2O+6O2↑6CO_2 + 12H_2O \space \space \overset{\text{light energy}}{\underset{\text{chlorophyll}}{\longrightarrow}} \space \space C_6H_{12}O_6 + 6H_2O + 6O_2 \uparrow

(v) The below labelled diagram shows an experimental setup demonstrating that oxygen is released during photosynthesis:

Draw a neat, labelled diagram of an experimental setup to show that oxygen is released during photosynthesis. ICSE 2019 Biology Solved Question Paper.