Biology (Raven), 9th Edition

Chapter 41: Sensory Systems in Plants

Pre-Test

1
If temperatures suddenly rise 5 to 10º C, __________ proteins are produced to help stabilize other proteins.
A)denatured
B)photosensitive
C)chilling
D)heat shock
E)oxidative
2
Rapid turgor pressure changes in specialized multicellular swellings called ____________ are associated with leaves that move in response to touch or light.
A)petioles
B)pulvini
C)stipules
D)pudicas
E)coleoptiles
3
The hormone _________ has a more pronounced role in stem elongation if auxin is also present.
A)ethylene
B)gibberellin
C)cytokinin
D)abscisic acid
E)brassinolide
4
________________ are complex carbohydrates that are released from plant cell walls and appear to regulate both pathogen responses and growth and development in some plants.
A)Brassinosteroids
B)Oligosaccharides
C)Cytokinins
D)Auxins
E)Glycoproteins
5
Which of the following statements about gravitropism is false?
A)Shoots exhibit negative gravitropism.
B)Amyloplasts play a role in perceiving gravity.
C)Gravitropic responses are evident at germination.
D)Ethylene is important in plants' responses to gravity.
E)In roots, the gravity-sensing cells are located in the root cap.
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