7. (a) (i) Name a part of a seed in which food for germination is stored - Leaving Cert Biology - Question 7 - 2014
Question 7
7.
(a) (i) Name a part of a seed in which food for germination is stored.
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(ii) Name the three factors necessa... show full transcript
Worked Solution & Example Answer:7. (a) (i) Name a part of a seed in which food for germination is stored - Leaving Cert Biology - Question 7 - 2014
Step 1
Name a part of a seed in which food for germination is stored.
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Answer
The part of a seed where food for germination is stored is called the cotyledon or endosperm.
Step 2
Name the three factors necessary for seeds to germinate.
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Answer
The three essential factors necessary for seed germination are:
Water: Seeds require moisture for the metabolic processes.
Oxygen: Seeds need oxygen for respiration.
Suitable temperature: A specific range of temperature is needed for growth.
Step 3
At the start of the investigation to show digestive activity during germination the seeds were sterilised. Why is this necessary?
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Sterilisation is necessary to kill or inhibit any microorganisms (such as bacteria and fungi) that could interfere with the experiment and affect the results.
Step 4
How did you sterilise the seeds?
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The seeds were sterilised by using a disinfectant (or named disinfectant) to eliminate unwanted microbes.
Step 5
Name the substance that is used as a medium on which to germinate the seeds.
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The substance used as a medium for germination is agar.
Step 6
What substance, to be digested by the seeds, was added to the above medium?
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The substance added to the agar medium was either starch or milk or protein.
Step 7
What control did you use in this demonstration?
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The control used in this demonstration involved using the same set-up and procedure with boiled seeds.
Step 8
How did you demonstrate digestive activity had taken place?
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Digestive activity was demonstrated by using iodine (or biuret solution). A negative result (described) beneath the seeds indicated the absence of (or digestion of) starch or protein.
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