The Science Teacher's Activity-A-Day, Grades 5-10 by Pam Walker & Wood Elaine

Author:Pam Walker & Wood, Elaine
Language: eng
Format: epub
Publisher: Wiley
Published: 2010-08-30T16:00:00+00:00

Follow-Up Questions

1. What did you use for the capsid of the virus? What materials make up the capsid of a virus?

2. If you could have cut away part of the capsid, what do you think would be found inside the capsid?

3. What two parts do all viruses have in common?

Extension

Viruses are generally classified according to their DNA or RNA content. Do some research, then illustrate and name two common viruses that contain DNA and two others that contain RNA.

9.8. BIRD DIGESTION

Why Birds Don’t Need Teeth

If you have ever watched a bird eat, you might have noticed that it does not chew. Birds do not have teeth. The food a bird eats is ground up in a section of its stomach called the gizzard. Birds occasionally swallow grit and small rocks by instinct, and these are stored in the gizzard. This muscular digestive organ then grinds and pulverizes the food into small pieces. The toughness of a bird’s gizzard varies with the species. In species that eat soft food, the gizzard is small. Once food has passed through the gizzard, it moves on into the intestines. In this activity you will make a model gizzard and see how well it works to grind up a bird’s food.

Materials

Two small towels

Gravel

Small cup of Cheerios

Two rubber bands

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