2. Estimate the size of a population

Question 1

Method

Answer 1

1. Stretch a long tape (TRANSECT LINE) across the area.
2. Place QUADRAT on ground RANDOMLY
3. COUNT number of individual plants of ONE SPECIES
4. REPEAT 2
5. WORK out MEAN no of PLANTS & show as no of plants per 1m2
6. Measure the WHOLE HABITAT
7. Multiply no of plants in 1m2 by the WHOLE AREA

Question 2

What are the ERRORS/CONSIDERATIONS when taking SAMPLES?

Answer 2

The ERRORS/CONSIDERATIONS when taking SAMPLES are:

• make sure the QUADRANTS are placed at RANDOM - can use RANDOM CO-ORDINATES to help with this
• the more SAMPLES the MORE ACCURATE the ESTIMATE

Question 3

What are the ERRORS/CONSIDERATIONS when taking SAMPLES?

Answer 3

The ERRORS/CONSIDERATIONS when taking SAMPLES are:

• make sure the QUADRANTS are placed at RANDOM - can use RANDOM CO-ORDINATES to help with this
• the more SAMPLES the MORE ACCURATE the ESTIMATE

Question 4

What is the VARIABLE?

Answer 4

The variable is:

The NUMBER of PLANTS IN THE QUADRAT

Question 5

HAZARDS & RISKS:-

Answer 5

HAZARDS & RISKS:

• WASH HANDS after work in a HABITAT - to stop transferring of organisms into mouth
• CARE throwing QUADRAT - on ground not in air