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Biology CCEA A2 Level 1.1 (Populations and Communities) 2024/2025Valready graded A+ R186,58   Add to cart
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Biology CCEA A2 Level 1.1 (Populations and Communities) 2024/2025Valready graded A+
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  • Ireland 1900-1925
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  • Ireland 1900-1925

Biology CCEA A2 Level 1.1 (Populations and Communities) 2024/2025Valready graded A+

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Document information

  • January 4, 2024
  • 4
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers

Subjects

  • ireland
  • what is a population ansa large group of organi
  • how is the size of a population calculated ansa
  • what is a haemocytometer ansa modified microsco
  • what takes place during the lag phase a

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  • Ireland 1900-1925
  • Ireland 1900-1925

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Ashley96

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Biology CCEA A2 Level 1.1 (Populations
and Communities)

What is a population? - ANSA large group of organisms of the same species living in a
particular habitat at a particular time

What is the technique used when estimating the abundance of animals? - ANSThe
mark-release-recapture technique

How does the mark-release-recapture technique work? - ANSA sample of animal species are
trapped using an appropriate technique. They are marked in some way and then released back
into their natural habitats. Later, a second sample is collected. Some will be marked and some
unmarked.

How is the size of a population calculated? - ANSAnimals in the first sample x animals in the
second sample/marked animals recaptured in the second sample

What assumptions does the mark-release-recapture technique rely on? - ANS- The marked
individuals had enough time to be redistributed
- There is no immigration or emigration
- There are few births and deaths
- The mark is harmless
- The mark does not wear off

What is a haemocytometer? - ANSA modified microscope slide

What is a haemocytometer used to measure? - ANSThe numbers of cells evenly distributed in
suspension

What is a population size? - ANSThe number of individuals in a population

What are the four stages of population growth? - ANS1. Lag Phase
2. Exponential Phase
3. Stationary Phase
4. Decline Phase

What takes place during the lag phase? - ANS- Slow increase in numbers
- Nutrient assimilation
- Bacteria may activate genes in order to produce appropriate enzymes

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