Ch 1 lesson 4

Gravitropism is a plant's response to

• gravity

• magnetism

• light

• touch

In the fall leaves change color because

• the amount of light is less and they stop making chlorophyll

• the amount of light increases and they stop making chlorophyll

• The temperature gets cooler

• Less daylight triggeres them to make more chlorophyll

Flowers bloom in the spring as a result of

• longer periods of daylight

• shorter periods of daylight

• gravity

• touch

In artificial selection

• nature decides which traits are passed down

• humans pick desirable traits to be passed down

• nature eliminated undesirable traits

• humans eliminate undesirable traits

Multicellular organisms grow in size by producing more

• organs

• muscles

• cells

• chlorophyll

In an experiment, factors that do not change are

• the independent variable

• the dependent variable

• constants

• bias

In an experiment, the group that has normal conditions and is used as a comparison is_________________

• Independent variable

• dependent variable

• constants

• control

Plants will bend towards this tropism

• phototropism

• gravitropism

• photoperiodism

• thigmotropism

This describes certain animals that undergo major body changes to become an adult

• mammal

• metamorphosis

• amniotic eggs

• placental animals

Which of the following is not a stimulus that triggers tropism in plants?

• light

• gravity

• touch

• temperature