A plant physiologist is studying two plant species: Species X, found in a temperate environment, and Species Y, found in a hot, arid desert. The physiologist measures the rate of carbon fixation in both species under varying light intensities and observes that Species Y maintains a higher rate of photosynthesis than Species X, even under high light intensities and water stress.
Which of the following statements best explains how Species Y is able to maintain a higher rate of photosynthesis under these conditions?
Species Y utilizes photorespiration more efficiently than Species X, allowing it to recycle carbon more effectively under stress.
Species Y is likely a CAM plant that minimizes water loss by opening its stomata at night and concentrating CO2 around Rubisco during the day.
Species Y has a higher concentration of Rubisco than Species X, enabling it to fix more carbon dioxide regardless of environmental conditions.
Species Y is a C3 plant that has evolved a more efficient form of Rubisco that does not bind to oxygen.
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Create Free Account Log inThis is a free VCE Units 3 & 4 Biology practice question worth 1 mark, testing your understanding of Rubisco & plant adaptations. It falls under How are biochemical pathways regulated? in Unit 3: How do cells maintain life?. Submit your answer above to receive instant AI-powered marking and personalised feedback.
In this unit students investigate the workings of the cell from several perspectives. They explore the relationship between nucleic acids and proteins as key molecules in cellular processes. Students analyse the structure and function of nucleic acids as information molecules, gene structure and expression in prokaryotic and eukaryotic cells and proteins as a diverse group of functional molecules. They examine the biological consequences of manipulating the DNA molecule and applying biotechnologies. Students explore the structure, regulation and rate of biochemical pathways, with reference to photosynthesis and cellular respiration. They explore how the application of biotechnologies to biochemical pathways could lead to improvements in agricultural practices. Students apply their knowledge of cellular processes through investigation of a selected case study, data analysis and/or a bioethical issue. Examples of investigation topics include, but are not limited to: discovery and development of the model of the structure of DNA; proteomic research applications; transgenic organism use in agriculture; use, research and regulation of gene technologies, including CRISPR-Cas9; outcomes and unexpected consequences of the use of enzyme inhibitors such as pesticides and drugs; research into increasing efficiency of photosynthesis or cellular respiration or impact of poisons on the cellular respiration pathway. A student-designed scientific investigation related to cellular processes and/or responses to challenges over time is undertaken in either Unit 3 or Unit 4, or across both Units 3 and 4, and is assessed in Unit 4, Outcome 3. The design, analysis and findings of the investigation are presented in a scientific poster format as outlined in the study design.
In this area of study students focus on the structure and regulation of biochemical pathways. They examine how biochemical pathways, specifically photosynthesis and cellular respiration, involve many steps that are controlled by enzymes and assisted by coenzymes. Students investigate factors that affect the rate of cellular reactions and explore applications of biotechnology that focus on the regulation of biochemical pathways.
the role of Rubisco in photosynthesis, including adaptations of C3, C4 and CAM plants to maximise the efficiency of photosynthesis
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