Question 1

Genes, acting in conjunction with the environment, control patterns of _________________.

Accepted Answer

A)  growth 
B)  development 
C)  differentiation 
D)  response to environmental changes 
E)  all of these

Question 2

Which of the following plant movements is due solely to an external stimulus?

Accepted Answer

A)  Helical (spiraling) movement 
B)  Nodding movement 
C)  Twining movement 
D)  Gravitropism 
E)  None of these answers are correct

Question 3

Special cells that facilitate the perception of gravity by root caps and coleoptiles are

Accepted Answer

A)  statoliths. 
B)  leucocytes. 
C)  taxes. 
D)  amyloplasts. 
E)  plebiscites.

Question 4

Plants that have two critical photoperiods in order to flower are called

Accepted Answer

A)  short-day plants. 
B)  long-day plants. 
C)  day-neutral plants. 
D)  critical-day plants. 
E)  intermediate-day plants.

Question 5

This plant pigment has two forms; one form absorbs red light and is then converted into the second form that absorbs far-red light.The second form, after absorption of far-red light, is converted back into the red absorbing form.This pigment is

Accepted Answer

A)  cryptochrome 
B)  phytochrome 
C)  chlorophyll b 
D)  beta carotene 
E)  auxotropin

Question 6

A reduction in the elongation of stems subject to mechanical stresses is called

Accepted Answer

A)  cladorestriction. 
B)  xylar reduction. 
C)  thigmomorphogenesis. 
D)  internode compression. 
E)  skototropism.

Question 7

External environmental factors influencing plant growth and development include __________.

Accepted Answer

A)  water quality 
B)  water availability 
C)  minerals 
D)  light 
E)  all of these

Question 8

Which of the following is used by nurseries to cause active plants to become dormant?

Accepted Answer

A)  Cytokinin 
B)  Ethylene 
C)  Abscisic acid 
D)  Gibberellins 
E)  Auxin

Question 9

Circadian rhythms are found in both plants and animals.

Accepted Answer

A) True 
 B)False

Question 10

Auxins promote the growth of the stem by

Accepted Answer

A)  promoting cell division.in the apical meristem. 
B)  by promoting cell elongation. 
C)  by promoting stomatal opening for greater photosynthesis. 
D)  by inhibiting flowering. 
E)  by inhibiting bud dormancy.

Question 11

Which of the following is an effect of light on auxin?

Accepted Answer

A)  It develops into a more complex substance. 
B)  It disintegrates completely. 
C)  It migrates away from the light against a diffusion gradient. 
D)  It is increased in quantity. 
E)  It produces a stronger response.

Question 12

Statoliths are involved in phototropisms.

Accepted Answer

A) True 
 B)False

Question 13

Dormancy caused by a thick, impervious seed coat may be overcome by filing or nicking the seed coat.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following is a simple device that rotates a potted plant slowly about a horizontal axis?

Accepted Answer

A)  Graviscope 
B)  Parallelostat 
C)  Phytomotor 
D)  Clinostat 
E)  None of these answers are correct

Exam 11: Growth

Genes, acting in conjunction with the environment, control patterns of _________________.

Which of the following plant movements is due solely to an external stimulus?

Special cells that facilitate the perception of gravity by root caps and coleoptiles are

Plants that have two critical photoperiods in order to flower are called

This plant pigment has two forms; one form absorbs red light and is then converted into the second form that absorbs far-red light.The second form, after absorption of far-red light, is converted back into the red absorbing form.This pigment is

A reduction in the elongation of stems subject to mechanical stresses is called

External environmental factors influencing plant growth and development include __________.

Which of the following is used by nurseries to cause active plants to become dormant?

Circadian rhythms are found in both plants and animals.

Auxins promote the growth of the stem by

Which of the following is an effect of light on auxin?

Statoliths are involved in phototropisms.

Dormancy caused by a thick, impervious seed coat may be overcome by filing or nicking the seed coat.

Which of the following is a simple device that rotates a potted plant slowly about a horizontal axis?