Define dispersal in relation to seeds - Leaving Cert Biology - Question 14(a) - 2018
Question 14(a)
Define dispersal in relation to seeds.
Suggest two reasons why dispersal is important to plants.
Give one way in which a knowledge of seed dormancy is useful to hum... show full transcript
Worked Solution & Example Answer:Define dispersal in relation to seeds - Leaving Cert Biology - Question 14(a) - 2018
Step 1
Define dispersal in relation to seeds.
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Answer
Dispersal refers to the process of carrying seeds away from the parent plant.
Step 2
Suggest two reasons why dispersal is important to plants.
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Answer
Dispersal reduces competition among plants by avoiding overcrowding and ensuring better survival rates.
It allows plants to colonize new areas or increase their population numbers.
Step 3
Give one way in which a knowledge of seed dormancy is useful to humans.
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Answer
Understanding seed dormancy helps in determining the correct environment for storage, optimal sowing times, or effective seed treatments to enhance growth.
Step 4
Name two essential environmental requirements for successful germination of seeds.
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Answer
Oxygen
Suitable temperature
Step 5
What is the role of digestion in germination?
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Answer
Digestion provides soluble nutrients or food necessary for the developing embryo.
Step 6
What is the role of respiration in seed germination?
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Respiration provides or releases energy for growth or supplies energy for the developing embryo.
Step 7
1. The initial decrease in mass.
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The initial decrease in mass can be attributed to respiration or food being used up as the seed utilizes stored reserves.
Step 8
2. The subsequent increase in mass.
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Answer
The subsequent increase in mass indicates that photosynthesis or food is being produced as the plant begins to grow.
Step 9
Name a substance which could be responsible for the changes shown in the graph.
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Glucose (or any other named sugar) or starch or lipids could be responsible for the changes in mass observed.
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