Macroinvertebrates As Indicators of A Healthy Aquatic Ecosystem

What does the term "aquatic macroinvertebrate" mean?

• They live in water, are visible to the naked eye, and have a backbone.

• They live in water, are visible to the naked eye, and do not have a backbone.

• They live on land, are visible to the naked eye, and do not have a backbone.

• They live in water, are microscopic, and do not have a backbone.

Where do aquatic macroinvertebrates typically live and what do they primarily eat?

• Deep water, other macroinvertebrates.

• Shallow water, algae and plants.

• Deep water, fish eggs.

• Shallow water, decaying wood.

What is the correct sequence of steps when using a dichotomous key to identify a macroinvertebrate?

• Look for a picture, then check for legs, then tails.

• Check for a shell, then legs, then wings, then tails.

• Check for wings, then tails, then legs, then a shell.

• Check for legs, then a shell, then tails, then wings.

Which of the following is a characteristic feature of stoneflies?

• They usually live in lakes and have three tails.

• They have flattened bodies, strong legs for crawling, and always two tails.

• Their gills are located on their abdomen, and they have a one-year life cycle.

• They have an internal skeleton and shed their skin in the water.

What water quality conditions are essential for stonefly survival?

• Warm, polluted water with low oxygen

• Cold, clean water with high oxygen

• Stagnant water with moderate oxygen

• Brackish water with varying oxygen levels

What is a distinguishing physical characteristic of mayfly nymphs?

• Gills located on their thorax

• A complete life cycle with a pupa stage

• Gills located on their abdomen

• The ability to build protective cases

Which life cycle stage is unique to caddisflies compared to stoneflies and mayflies?

• Egg

• Nymph

• Pupa

• Adult