The diagram shows an organism you have studied - Leaving Cert Biology - Question 17 (a) - 2021
Question 17 (a)
The diagram shows an organism you have studied.
(i) Name the organism shown in the diagram and the kingdom to which it belongs.
(ii) Name the part labelled A.
(ii... show full transcript
Worked Solution & Example Answer:The diagram shows an organism you have studied - Leaving Cert Biology - Question 17 (a) - 2021
Step 1
Name the organism shown in the diagram and the kingdom to which it belongs.
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Answer
The organism shown in the diagram is Rhizopus, commonly known as bread mould. It belongs to the kingdom Fungi.
Step 2
Name the part labelled A.
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Answer
The part labelled A is the sporangium.
Step 3
State the mode of nutrition used by this organism.
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Answer
The mode of nutrition used by this organism is saprophytic or heterotrophic.
Step 4
Discuss the importance in nature of the type of nutrition named at part (iii) above.
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Saprophytic nutrition is important in nature because it allows organisms like Rhizopus to decompose organic matter. This process recycles nutrients back into the ecosystem, making them available for other organisms. It also contributes to soil fertility and plays a critical role in breaking down dead materials, which helps in the natural cycle of life.
Step 5
Name the horizontal hypae labelled B and state their role:
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The horizontal hypae labelled B are known as stolons. Their role is to spread the fungus asexually by connecting different colonies of the fungus.
Step 6
Give one function of each.
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Spores are responsible for asexual reproduction or dispersal of the organism. Rhizoids serve as an anchorage or secretion, helping the fungus to anchor itself to the substrate and absorb nutrients.
Step 7
Describe one environmental condition which may stimulate sexual reproduction in this organism.
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One environmental condition that may stimulate sexual reproduction in Rhizopus is drought or unsuitable temperature, as these stresses can trigger the formation of sexual reproductive structures.
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