Sampling Techniques and Environmental Indicators

This video lesson covers the distribution of organisms, focusing on abiotic and biotic factors, their measurement, and sampling techniques. It explains how to use paired statement keys for organism identification and discusses indicator species as markers of environmental quality. The lesson aims to equip students with the ability to describe and measure these factors, understand their effects on biodiversity, and identify organisms using biological keys.

Which of the following is NOT a learning objective mentioned in the introduction?

• Explain the process of photosynthesis

• Describe abiotic and biotic factors

• Explain what an indicator species is

• Use and construct paired statement keys

Which of the following is an example of an abiotic factor?

• Predation

• Competition for resources

• Disease

• Light intensity

What is the correct definition of biotic factors?

• Physical factors that affect organisms

• Non-living factors that affect organisms

• Living factors that affect organisms

• Chemical factors that affect organisms

Which instrument is used to measure light intensity?

• pH meter

• Thermometer

• Moisture meter

• Light meter

What is a possible source of error when using a light meter?

• Standing in the path of the light

• Not calibrating the meter

• Measuring at night

• Using the wrong type of meter

Which sampling technique is used for estimating the abundance of plants or slow-moving animals?

• Transect line

• Pitfall trap

• Sweep net

• Quadrat

How can the source of error due to non-random sampling in quadrats be minimized?

• By counting only the largest plants

• By using more quadrats

• By placing the quadrats randomly

• By using a larger quadrat

What is the purpose of a paired statement key?

• To sample invertebrates

• To estimate plant abundance

• To identify organisms

• To measure abiotic factors

Which of the following is an indicator species for water pollution?

• Lichen

• Shrubby lichen

• Mayfly nymph

• Crusty lichen

What does the presence of sludge worms in a river indicate?

• High pollution levels

• Low pollution levels

• Presence of predators

• High oxygen concentration