Y9 Biology Term 2 (Spring 2023)

Why do scientists use sampling techniques to gather population data rather than counting everything?

• sampling is more efficient and achievable
• scientists are lazy
• sampling is cheaper
• scientists prefer estimations

Ten 1m2 quadrats were placed in a 40m2 field. On average 2 snails were found in every quadrat. Estimate the population size of the whole field.

• 80
• 20
• 10
• 40

Food webs always start with:

• the sun
• producers
• primary consumers
• microorgansims

All the organisms that live and interact in an ecosystem

• Community
• Population
• Habitat
• Interdependent

What is the best way to place a quadrat?

• Divide the sample area into a grid and use a random number generator to choose a square.
• Place it where you like
• Throw the quadrat so it's random
• Divide the sample area into a grid and choose a square.

Which of the following is a biotic factor?

• Food availability
• Temperature
• pH
• Moisture

Which of the following reasons explains why grass grows abundantly in a field but not in a wood?

• There is a higher light intensity in the field for photosynthesis
• The woodland animals have eaten all the grass
• The wood will be too sheltered from the wind
• There is a lower light intensity in the field for photosynthesis

Temperature is measured using a...

• Thermometer
• Light meter
• pH meter
• Moisture meter

Quadrats are used to estimate the number of...

• Plants and slow-moving animals
• Large animals
• Insects
• Plants

Organisms that make their own food are called...

• Producers
• Decomposers
• Consumers
• Creators