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Photosynthesis in Higher Plants

Short Answer Type

91. Name two green house crops. What is the type of these plants and why are they used in the green houses?

Tomatoes and bell pepper are the two green house crops. They are C3 plants. They are used in the green houses as they respond to higher CO₂concentrations by showing increased rates of photosynthesis which in turn leads to higher yield. These are allowed to grow in carbon dioxide enriched atmosphere that leads to higher yields.

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Long Answer Type

92. Describe Priestley’s experiment.

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Short Answer Type

93. Why a plant cannot survive for long time at compensation point ?

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94. What does the chemiosmotic hypothesis state?

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95. Name the products of light reaction and where they are used ?

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96. By looking at a plant externally can you tell whether a plant is C₃ or C₄? Why and how?

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97. By looking at which internal structure of a plant can you tell whether a plant is C₃ or C₄? Explain.

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Long Answer Type

98. Even though a very few cells in a C₄ plant carry out the biosynthetic – Calvin pathway, yet they are highly productive. Can you discuss why?

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Short Answer Type

99. RuBisCo is an enzyme that acts both as a carboxylase and oxygenase. Why do you think RuBisCo carries out more carboxylation in C₄ plants?

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Long Answer Type

100. Suppose there were plants that had a high concentration of Chlorophyll-b, but lacked chlorophyll-a, would it carry out photosynthesis? Then why do plants have chlorophyll-b and other accessory pigments?

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