Seeds may be classified as either endospermic or non-endospermic, based on whether food is stored in endosperm or cotyledon tissue - Leaving Cert Biology - Question 15(a) - 2015
Question 15(a)
Seeds may be classified as either endospermic or non-endospermic, based on whether food is stored in endosperm or cotyledon tissue. Seeds may also be either monocoty... show full transcript
Worked Solution & Example Answer:Seeds may be classified as either endospermic or non-endospermic, based on whether food is stored in endosperm or cotyledon tissue - Leaving Cert Biology - Question 15(a) - 2015
Step 1
Following fertilisation, from precisely which part of the flower is the seed formed?
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Answer
The seed is formed from the ovule of the flower after fertilisation.
Step 2
What is meant by the term monocotyledonous?
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Answer
Monocotyledonous refers to plants that have a single seed leaf (cotyledon) when they germinate.
Step 3
Name two biomolecules stored in endosperm or cotyledon tissue.
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Two biomolecules stored in endosperm or cotyledon tissue are lipids and carbohydrates.
Step 4
Give one way knowledge of seed dormancy has been useful to humans.
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Answer
Knowledge of seed dormancy has allowed humans to store seeds for longer periods, ensuring that they can be planted at optimal times for growth.
Step 5
Suggest why the measurement of dry mass is preferred in these investigations.
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Answer
The measurement of dry mass is preferred because it provides a more accurate representation of the biomass of the tissues, eliminating the variability introduced by water content.
Step 6
Explain why the dry mass of the endosperm tissue decreases over the three weeks.
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The dry mass of the endosperm decreases as food is transferred to the embryo for growth and development during germination.
Step 7
What process begins at A?
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The process that begins at A is photosynthesis, as the embryo starts to produce its own food.
Step 8
Would you expect the total dry mass of the seed (embryo plus endosperm) to have remained the same up to A? Explain your answer.
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No, I would not expect the total dry mass to remain the same up to A, as it would likely decrease due to respiration or loss of carbon dioxide as the seed metabolizes stored food.
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