Why should the light-dependent reaction occur before the light-independent reaction?

Short/Brief Note

During light-dependent reaction, photosynthesis pigment absorbs the light energy and convert it into chemical energy ATP and NADPH₂.

During light-independent CO₂ is reduced into carbohydrates with the help of ATP and NADPH₂ produced during the light-dependent reaction.

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Chapter 12 Plant Anatomy and Plant Physiology
Evaluation | Q VI. 7. | Page 185

The number of water molecules required in the chemical reactions to produce one molecule of glucose during photosynthesis is

During photosynthesis, the oxygen in glucose comes from

Mention one difference between the following on the basis of what is given in bracket.

Respiration and photosynthesis (gas released)

Are the following statement true or false? Give a reason in support of your answer.

Photosynthesis is considered as a process supporting all life on earth.

What is meant by the photolysis of water?

The figure below represents the vertical section of a leaf:

(i) Name the parts 1 to 5.
(ii) How many veins have been shown?
(iii) State the functions of parts 4 and 5.

Complete the following sentence with appropriate word:

A dark reaction is a __________ reaction.

Write the functional activity of the following structure:
Stroma

Choose the correct option.

The sequential order in electron transport from PSII to PSI of photosynthesis is ______.

A potted plant with variegated leafes was kept in dark for 24 hours and then placed in bright sunlight. Answer the following questions.

Which aspect of photosynthesis is being tested in the above diagram?
Why was the plant kept in the dark for 24 hours?
After the starch test, what will be the colour of the yellow and green parts of the leaf? Give reasons to support your answer.