Moths on Pale and Sooty Bark

In the picture

1. 1A pale speckled moth on pale lichen-covered bark
2. 2A black moth on pale lichen-covered bark
3. 3A songbird on the left with its beak toward the black moth
4. 4Soot-blackened bark on the right trunk with a black moth resting on it
5. 5A pale speckled moth on soot-blackened bark with a songbird’s beak directed toward it

Examples

• Antibiotic-resistant bacteria survive treatment and reproduce.
• Pesticide-resistant insects survive spraying and pass on resistance.

Quiz: Moths on Pale and Sooty Bark (Age 14)

1. 1

   According to the card, what is true about individuals in a moth population?

   • They can decide to change colour to match the bark.
   • They are all identical in colour.
   • They vary in inherited traits.
2. 2

   What can a changed environment do to the survival chances of different moth forms?

   • It causes every moth to change into the other form.
   • It makes all forms equally likely to survive and reproduce.
   • It can make one form more likely to survive and reproduce.
3. 3

   How does bird predation affect the two moth forms in the two environments described?

   • It favours the same form on both pale and sooty bark.
   • It favours pale moths on pale bark and dark moths on sooty bark.
   • It favours dark moths on pale bark and pale moths on sooty bark.

The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.