Unit 3 Exam (Modified)

Some baby birds peck at a red dot under their parent’s beak. This triggers a gagging reflex in the parent. Which option describes how this behavior increases fitness?

• The parent moves to cover the baby birds. The baby birds can remain warm.

• The parent regurgitates the partly digested food for the baby bird. The baby bird can eat this food.

Which option correctly states what belongs in boxes A and B?

• A – needs practice B – may be simple or complex

• A – needs practice B – simple

• A – successful on first try B – may be simple or complex

In temperate regions, a lot of animals are active in daylight and inactive at night. This is [blank 1] because daytime temperatures are warm, and animals can rely on their [blank 2] to find food.

Which option shows how to correctly complete these statements?

• blank 1: a survival disadvantage

  blank 2: sight

• blank 1: a survival advantage

  blank 2: sight

[Blank 1] are known at birth. [blank 2] are learned later in life.

Which option correctly completes these statements?

• Blank 1: Learned behaviors

  Blank 2: Innate behaviors

• Blank 1: Innate behaviors

  Blank 2: Learned behaviors

Which option describes why some bird species migrate?

• Some birds migrate to avoid predators. Predators are known to follow birds wherever they go. The birds move to avoid being hunted.

• Some birds migrate to avoid harsh winter and summer conditions. By migrating, birds can be in regions that experience mild winters and mild summers.

• Some birds migrate so that their young can learn to fly. Without flying these distances, the wing muscles of young birds do not develop properly.

Which physical adaptations increase an organism’s chances of finding food? (Select all that apply.)

• the trunk of the elephant

• the tail of the peacock

• the echolocation of whales and dolphins

• the tail of the beaver

Which physical adaptation increases an organism’s chances of finding a suitable habitat?

• the long legs of wading birds

• the quills of a porcupine

Which physical adaptations increase an organism’s chances of physically defending itself? (Select all that apply.)

• the venom of snakes

• the quills of a porcupine

• the bright feathers of birds

• the horns of cattle

Which physical adaptations increase an organism’s chances of going unnoticed? (Select all that apply.)

• the fur coloring of polar bears

• the strong smell produced by a skunk

• the wax-producing glands of bees

• the color-changing ability of octopuses

Which physical adaptation increases a flower’s chances for successful pollination?

• producing flowers with attractive colors

• having bitter-tasting leaves