In the diagram, a plastic bag is placed around the stem of a plant - Junior Cycle Science - Question 3 - 2014
Question 3
In the diagram, a plastic bag is placed around the stem of a plant. After some time, droplets of water are seen on the inside of the plastic bag.
(i) Describe how t... show full transcript
Worked Solution & Example Answer:In the diagram, a plastic bag is placed around the stem of a plant - Junior Cycle Science - Question 3 - 2014
Step 1
Describe how the droplets could be tested to show that they contain water.
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Answer
To test if the droplets contain water, one can add a few drops of the liquid from the plastic bag onto a piece of anhydrous copper sulfate (CuSO₄) or cobalt chloride paper. If the liquid is water, the copper sulfate will change from white to blue, or the cobalt chloride will turn from blue to pink.
Step 2
Explain why the plastic bag is tied around the stem of the plant, rather than placed over both the plant and the pot.
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Answer
The plastic bag is tied around the stem to ensure that the water collected in the bag comes from the leaves of the plant and not from the soil in the pot. This method isolates the source of the water.
Step 3
What name is given to the movement of water through a plant and the evaporation of water from its leaves?
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Answer
This process is referred to as transpiration.
Step 4
What type of tissue does the plant use for the transport of water?
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Answer
The plant uses xylem tissue for the transport of water.
Step 5
Mark with the letter X the part of the flower where pollen is produced.
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X should be marked in an anther.
Step 6
Mark with the letter Y the part of the flower where fertilisation occurs.
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Y should be marked in an ovary.
Step 7
Explain why having brightly coloured petals can assist sexual reproduction in some plants.
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Answer
Brightly coloured petals attract insects, which aid in the transport of pollen from one flower to another, facilitating pollination and thus contributing to successful reproduction.
Step 8
Describe, with the aid of labelled diagrams, how the student might have set up each of the four test tubes.
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Answer
The student may have set up test tube A with seeds and no water (dry conditions), test tube B with seeds and water but no light (dark conditions), test tube C with seeds exposed to both water and light, and test tube D with seeds in optimal conditions of moisture and light, which explains why only seeds in tube D germinated.
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