12 M Biology test Sept . 15th - Tactic Movements & Tropism

A change in the growth of a plant in response to gravity is known as ____________________.

• geotropism

• phototropism

• taxis

Plant growth towards light is known as _______________________.

• geotropism

• phototropism

• aerotaxis

_____________ is the movement of an organism in response to a stimulus.

• geotropism

• phototropism

• Taxis

________________ are a powerful growth hormone produced naturally by plants. They are found in shoot and root tips and promotes cell growth and elongation of the plant.

• Cytokinins

• Gibberellin

• Auxins

___________ signals dehydration of the plant. Stomata closes to retain water.

• Abscisic acid

• phototropism

• Autotropism

____________ means stimulation by oxygen.

• barotaxis

• Anemotaxis

• Aerotaxis

__________________ means stimulated by chemicals.

• aerotaxis

• chemotaxis

• barotaxis

_______________ means stimulated by moisture.

• hydrotaxis

• chemotaxis

• aerotaxis

____________ is a migration along a gradient of temperature.

• phototaxis

• thermotaxis

• phonotaxis

_______________ is the response of an organism to physical contact.

• phonotaxis

• thermotaxis

• Thigmotaxis