Plant Hormones and Tropisms

Question 1

proteins activated by specific signals; can be found in the plasma membrane, nucleus, and endoplasmic reticulum

Answer 1

receptors

Question 2

series of relay proteins or enzymes; amplify and transform the signal to one that the cell can understand

Answer 2

transduction pathway

Question 3

result of the transduction pathway; the transcription of genes or product of a metabolic pathway

Answer 3

cellular response

Question 4

chemical signals produced in very low concentration and cause the response to the stimuli

Answer 4

plant hormones

Question 5

growth toward a stimulus

Answer 5

positive tropism

Question 6

growth away from a stimulus

Answer 6

negative tropism

Question 7

permits plant to bend in the direction of sunlight; synthesized at the stem tips; movement is downwards

Answer 7

auxins

Question 8

necessary for plant germination; nurtures internodes’ elongation

Answer 8

gibberellins

Question 9

result of multiple attempts of growth; promotes cell division; produced in the root apical meristem; movement is upwards; counters senescence

Answer 9

cytokinins

Question 10

a gas formed from the amino acid, methionine. it is involved in abscission and fruit ripening

Answer 10

ethylene

Question 11

plant growth in response to a light stimulus

Answer 11

phototropism

Question 12

plant growth in response to touch or contact with a solid object

Answer 12

thigmotropism

Question 13

this type of growth occurs when the cells in one area of a plant organ, such as stem or root, grow more quickly than the cells in the opposite area

Answer 13

differential growth

Question 14

growth or movement response of a cell or an organism to gravity

Answer 14

geotropism/gravitropism

Question 15

growth or movement in response to water concentrations

Answer 15

hydrotropism

Question 16

growth or movement in response to chemicals

Answer 16

chemotropism

Question 17

growth or movement in response to heat or temperature changes

Answer 17

thermotropism

Question 18

growth or movement in response to darkness

Answer 18

skototropism