Inquiry Lab- Investigating Worms

Essential Question: How do biologists study living things?

Earthworm

Lumbricus terrestis means

Earthworm Anatomy

Earthworm Classification

Observing your worm

Get a paper towel Moisten it Clear your desks except for paper and

pen Only use your hands to touch the

worm Keep your worm on the towel Observe its heartbeat

Observing its heartbeat

Find the artery in the tail end Focus on 2-3 segments Count how many times its switches

from light to dark in 30 seconds

In your lab notebooks

Introduction: Make a table of observations/inferences

(5)

Doing things in a scientific way

Observe Wonder Question PLAY (perform your experiment)

Potential Questions to ask

What condition(s) cause a worm’s heart rate to increase?

How many times will a worm select (move towards) a specific condition?

How long does it take for a worm to respond to a specific condition?

Experimental Design Guidelines

(IF) Independent Variable: condition or situation you will set up

(THEN) Dependent Variable: Must be quantitative the NUMBER that you will record

IF/THEN hypothesis should reflect your question

Hypothesis predicts how variables will change

IF the temperature increases, THEN heart rate will go up.

010

2030

4050

607080

90

RoomTemp

Warm

WormAWormBWormC

Data collection should reflect your question

Independent Variable (x-axis) =

Dependent Variable (y-axis) =

010

2030

4050

607080

90

RoomTemp

Warm

WormAWormBWormC

Conclusions--Evaluate your hypothesis and explain results/error

Respond to your hypothesis using data.

Connect to ideas and future experiments

Explain errors and suggest improvments to minimize error

Your Lab Notebooks Introduction/Observations Hypothesis (If…then…because) Procedure:

Variables: IV, DV, Controls What you did

Data: Table (organized collection of data) Graph (sketch)

Conclusion: Data/Response to hypothesis, Future Testing,

Errors