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

Give biological explanations for Plants growing in fertilized soil are often found to wilt if the soil is not adequately watered.

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.

The following statement is about photosynthesis in a green plant. Write whether it is True or False.

Photosynthesis stops at a temperature above 35°C.

Fill in the blank:
Photosynthesis produces oxygen and ______.

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.

If you immerse a leaf intact on the plant in ice cold water, it will continue to photosynthesise in bright sunshine.

Name the molecules which are called assimilatory power? Why are they called so?

Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:

Leaves are broad and flat to increase the surface area for photosynthesis.

Choose the correct option.

The net result of photo-oxidation of water is release of ______.