(a) The diagram shows a plant with variegated leaves i.e - Junior Cycle Science - Question 3 - 2010
Question 3
(a) The diagram shows a plant with variegated leaves i.e. the leaves have areas with different colours. The leaves of this plant have a green centre with pale yellow... show full transcript
Worked Solution & Example Answer:(a) The diagram shows a plant with variegated leaves i.e - Junior Cycle Science - Question 3 - 2010
Step 1
Why was the plant left in darkness for a day at the start of the experiment?
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Answer
The plant was left in darkness to destarch the leaves, ensuring that any starch produced during the experiment could be accurately measured. This allows for the investigation of starch production purely from photosynthesis occurring during the light exposure.
Step 2
Why?
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Answer
The leaf was boiled in water to kill or soften it, making it easier to remove chlorophyll and aiding the subsequent steps in the experiment.
Step 3
Draw a labelled diagram, in the box, showing the apparatus and named liquid used to remove the green pigment from the leaf.
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A labelled diagram should show a test tube containing alcohol, and the boiled leaf suspended in hot water being heated over a flame. The labels should clearly differentiate between the 'Alcohol' and 'Hot water' within the apparatus.
Step 4
Name the solution used.
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Answer
Iodine is the solution used to test for the presence of starch in the leaf.
Step 5
Suggest a reason why the leaf margins did not turn blue-black.
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Answer
The leaf margins did not turn blue-black because they lack chlorophyll, meaning they cannot photosynthesize to produce starch, which is essential for the iodine test to show a positive result.
Step 6
Name part A of the carpel and give its role in the sexual reproduction of plants.
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Name: Ovary
Role: The ovary contains the ovules, which develop into seeds upon fertilization and is crucial for sexual reproduction in plants.
Step 7
Name part B of the stamen and give its role in the sexual reproduction of plants.
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Name: Anther
Role: The anther produces pollen, which contains the male gametes necessary for fertilization.
Step 8
Give a way in which the pollen from the flower of one plant can be transferred to the flower of another plant.
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Pollen can be transferred by various means such as wind, insects, or through water droplets when transferring pollen from one flower to another.
Step 9
Name the cell that is formed when a male gamete (sperm) and a female gamete (egg) combine.
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Name: Zygote.
Step 10
What does the cell formed by the fusion of the male and female gametes of a flowering plant grow and develop into?
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The zygote grows and develops into an embryo, seed, or eventually a fruit in flowering plants.
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