Describe reproduction by spores in Rhizopus.
Describe reproduction by spores in Rhizopus.
Official answer
Reproduction by spores in Rhizopus (commonly known as bread mould) is an asexual mode of reproduction described below:
- Structure: The vegetative body of Rhizopus consists of thread-like structures called hyphae, which are not directly involved in reproduction. At the tips of specialized hyphae, tiny, blob-on-a-stick structures called sporangia develop.
- Spore Formation: Inside these sporangia, numerous small, unicellular reproductive units called spores are formed through cell division.
- Protection and Germination: The spores are covered by thick, protective walls that shield them from unfavorable environmental conditions (such as dryness or lack of nutrients). When the sporangia mature, they burst open, releasing the spores into the air. When these airborne spores land on a suitable moist and warm surface (like a wet slice of bread), they germinate and grow into new Rhizopus individuals.
Marking scheme
- 1.1 mark
- 2.1 mark
- 3.1 mark
Hint
Focus on the 'blob-on-a-stick' structures called sporangia, the spores inside them, and how their thick walls help them survive until they find moisture.
Quick oral answer
Rhizopus reproduces by forming spores inside tiny blob-like structures called sporangia. These spores have thick walls to survive harsh conditions and germinate when they land on a moist surface.
Common mistakes
- 1.Confusing hyphae as the reproductive parts instead of sporangia.
- 2.Forgetting to mention the protective thick wall of spores that helps them survive unfavorable conditions.
Analysis and explanation
Rhizopus utilizes spore formation as a highly efficient asexual reproduction strategy. The thick walls of the spores act as a protective barrier against desiccation, allowing them to remain dormant in the air for long periods. Once favorable conditions (moisture and organic nutrients) are met, they quickly germinate, which explains why bread left in moist, dark places rapidly molds.
Interesting facts
Spores of Rhizopus are constantly floating in the air around us, which is why a slice of bread left in a moist, dark place quickly develops mould without any visible contact with another fungus.
Question details
Q14 of 36 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2017
- Section
- Section A
- Marks
- 3
- Type
- Short Answer
- Chapter
- How do Organisms Reproduce?
- Topic
- Spore Formation in Rhizopus
- Bloom's level
- Remembering
- Syllabus topic
- Asexual reproduction: Spore formation
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Frequently asked questions
How many marks does this question carry in CBSE Class 10 Science 2017?
This question carries 3 marks in the CBSE Class 10 Science 2017 examination.
Which chapter does this question come from in Science?
This question is from the chapter "How do Organisms Reproduce?" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Spore Formation in Rhizopus" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2017 paper?
This is a Short Answer question from Section A in the CBSE Class 10 Science 2017 paper.