Every October in North America, Monarch butterflies migrate south - Edexcel - GCSE Biology - Question 2 - 2017 - Paper 1
Question 2
Every October in North America, Monarch butterflies migrate south.
This migration is affected by environmental factors and circadian rhythms.
The migration of Monarc... show full transcript
Worked Solution & Example Answer:Every October in North America, Monarch butterflies migrate south - Edexcel - GCSE Biology - Question 2 - 2017 - Paper 1
Step 1
A circadian rhythm is a
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Answer
The correct answer is A: a daily cycle. Circadian rhythms refer to biological processes that follow a 24-hour cycle, such as sleep-wake patterns.
Step 2
Describe what is meant by innate behaviour.
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Answer
Innate behaviour is a type of behavior that is genetically programmed and does not require learning or experience. It is instinctual and is often performed in response to specific stimuli.
Step 3
Suggest why Monarch butterflies migrate south in October.
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Answer
Monarch butterflies migrate south in October to escape the colder temperatures of the northern regions. This migration helps them find more favorable climates to survive the winter months.
Step 4
Calculate the mean population of Monarch butterflies between 2004 and 2012.
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Answer
To find the mean population of Monarch butterflies from 2004 to 2012, we add the populations in those years: 10 million (2004) + 9 million (2008) + 2 million (2012) = 21 million. Then we divide this by the number of years (3):
extMean=321 million=7 million.
Step 5
State a conclusion that can be made from these two means.
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Answer
A conclusion that can be drawn is that the population of Monarch butterflies has significantly decreased from the previous population (mean of 15 million from 1992 to 2000) to a much lower mean (7 million) between 2004 and 2012, indicating a decline in their numbers over these years.
