Estimating Population Size and Density of Daisies

Dr. Acton from Malmesbury Science explains how to estimate the population size of daisies in a field using a quadrat. The process involves measuring the field, setting up a grid, and using random sampling to count daisies. The results are used to calculate the total population. Additionally, a transect method is demonstrated to observe how population density varies across the field, highlighting the impact of biotic and abiotic factors.

What tool is used to measure the length and width of the field?

• A ruler

• A measuring tape

• A trundle wheel

• A compass

Why is a random number generator used in the sampling process?

• To ensure the quadrat is placed in the center

• To remove any bias in choosing coordinates

• To calculate the total area

• To measure the length of the field

How many positions does the teacher decide to sample in the video?

• 30 positions

• 20 positions

• 10 positions

• 5 positions

What is the criterion for counting a daisy within the quadrat?

• Over half of the daisy must be within the quadrat

• The daisy must be touching the quadrat

• The daisy must be outside the quadrat

• The daisy must be fully inside the quadrat

How is the total population of daisies estimated?

• By measuring the field's perimeter

• By counting all daisies in the field

• By using a random number generator

• By multiplying the mean average by the total number of meter squares

What is the purpose of laying a tape measure along the area?

• To calculate the total area

• To mark the boundary of the field

• To measure the width of the field

• To sample along a transect line

What does the line graph show in the transect method?

• The average size of daisies

• The change in population density with distance

• The length of the transect

• The total number of daisies in the field

What is a biotic factor mentioned in the video?

• Temperature

• People trampling daisies

• pH of the soil

• Light intensity

Which of the following is an abiotic factor?

• Human activity

• Number of daisies

• Soil pH

• Presence of insects

What is the likely cause of increased daisy density further from the gate?

• Higher light intensity

• More nutrients in the soil

• Less trampling by people

• Better water availability