Fig. 4.1 shows the effect of light intensity on the rate of photosynthesis at different temperatures and concentrations of carbon dioxide. Describe and explain the reasons for the shape of lines B and C in Fig. 4.1.

Biology

IGCSE&ALevel

CAIE

Exam No：0610_s23_qp_41 Year：2023 Question No：4(a)

Answer:

Knowledge points:

6.1.1 Define photosynthesis as the process by which plants manufacture carbohydrates from raw materials using energy from light

6.1.10 State the balanced chemical equation for photosynthesis

6.1.11 Explain that chlorophyll transfers light energy into chemical energy in molecules, for the synthesis of carbohydrates

6.1.12 Outline the subsequent use and storage of the carbohydrates made in photosynthesis

6.1.13 more contents

6.1.14 Define the term limiting factor as something present in the environment in such short supply that it restricts life processes

6.1.15 Identify and explain the limiting factors of photosynthesis in different environmental conditions

6.1.16 Describe the use of carbon dioxide enrichment, optimum light and optimum temperatures in glasshouses in temperate and tropical countries

6.1.17 Use hydrogencarbonate indicator solution to investigate the effect of gas exchange of an aquatic plant kept in the light and in the dark

6.1.2 State the word equation for photosynthesis: carbon dioxide + water → glucose + oxygen, in the presence of light and chlorophyll

6.1.3 State the word equation for photosynthesis: carbon dioxide + water → glucose + oxygen, in the presence of light and chlorophyll

6.1.4 State the word equation for photosynthesis: carbon dioxide + water → glucose + oxygen, in the presence of light and chlorophyll

6.1.5 Investigate the necessity for chlorophyll, light and carbon dioxide for photosynthesis, using appropriate controls

6.1.6 Investigate and describe the effects of varying light intensity, carbon dioxide concentration and temperature on the rate of photosynthesis, e.g. in submerged aquatic plants

6.1.7 Investigate and describe the effects of varying light intensity, carbon dioxide concentration and temperature on the rate of photosynthesis, e.g. in submerged aquatic plants

6.1.8 Investigate and describe the effects of varying light intensity, carbon dioxide concentration and temperature on the rate of photosynthesis, e.g. in submerged aquatic plants

6.1.9 Investigate and describe the effects of varying light intensity, carbon dioxide concentration and temperature on the rate of photosynthesis, e.g. in submerged aquatic plants

Fig. 4.1 shows the effect of light intensity on the rate of photosynthesis at different temperatures and concentrations of carbon dioxide. Describe and explain the reasons for the shape of lines B and C in Fig. 4.1.

Answer:

Knowledge points:

Solution:

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