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The bird’s-nest fern, Alocasia macrorrhiza, usually grows in deeply shaded rainforests and has dark green fronds - VCE - SSCE Biology - Question 4 - 2007 - Paper 1
Question 4
The bird’s-nest fern, Alocasia macrorrhiza, usually grows in deeply shaded rainforests and has dark green fronds. Sometimes it is found in open, sunny locations by r... show full transcript
Worked Solution & Example Answer:The bird’s-nest fern, Alocasia macrorrhiza, usually grows in deeply shaded rainforests and has dark green fronds - VCE - SSCE Biology - Question 4 - 2007 - Paper 1
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b. Which drawing, A or B, shows a chloroplast from the rainforest habitat? Explain the reason for your choice in terms of the relationship between structure and function.
Answer
Drawing A shows a chloroplast from the rainforest habitat. This is because the cells from this environment generally have more chlorophyll and larger surface areas in their chloroplasts, which is essential for optimal light absorption given the shaded conditions.
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c. Name the process by which the chemical reactants for the light-dependent reactions of photosynthesis enter a chloroplast.
Answer
The process by which the chemical reactants enter a chloroplast is known as diffusion. This includes the diffusion of water and carbon dioxide into the chloroplasts.
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e. Name one structural feature of chloroplasts or mitochondria and outline how it supports the endosymbiotic theory for the origin of these organelles.
Answer
One structural feature is that both organelles contain their own DNA and are capable of self-replication. This supports the endosymbiotic theory, as it suggests that chloroplasts and mitochondria might have originated from free-living prokaryotic cells that were engulfed by ancestral eukaryotic cells.
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g. What is the source of these energy carriers?
Answer
The source of the energy carriers NADPH and ATP used during the light-independent reactions is the light-dependent reactions of photosynthesis, where energy from sunlight is captured and used to convert ADP and NADP+ into ATP and NADPH.
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