Factors Influencing Growth

When plants go through tropism they are responding to a __.

• hormone

• stimulus

• essential nutrient

• gene

What are the chemicals in a plant that control responses to stimuli?

• tropisms

• photoperiodisms

• hormones

• genes

What is tropism in plants?

• a plant's growth response toward or away from a stimulus

• a plant getting sunlight, CO2, and water to create glucose and oxygen

• plants staying dormant in the winter

What is the term for when an organism's activities or growth stops?

• stimulus

• photoperiodism

• tropism

• dormancy

Plant's response to light.

• negative tropism

• hormone

• dormancy

• phototropism

What role does gravity play in gravitotropism?

• response

• stimulus

• auxin

A plant's response to the changes in the lengths of days and nights is called what?

• phototropism

• photoperiodism

• photography

• photoautotroph

What organ in most mammals provides nutrients between the mother and the embryo?

• stomach

• umbilical cord

• placenta

• kidney

What is the developing organism in the egg called?

• zygote

• embryo

• child

In many eggs of birds and reptiles, where does the embryo get its nutrients?

• the egg's shell

• the placenta

• egg's yolk