Lesson NGPS:B2-2
Asexual Propagation
 
CD NGPS.  Plant Biology (5E Outline)
Unit B.  Plant Reproduction
Problem Area 2.  Plant Propagation
Lesson 2.  Asexual Propagation
 
 
Adventitious root initiation is promoted by _____.
a)high levels of abscisic acid and low levels of cytokinins
b)high levels of auxins and low levels of cytokinins
c)high levels of cytokinins and low levels of auxins
d)high levels of gibberellins and low levels of ethylene

Answer: b
Why should cuttings be taken from healthy actively growing plant material?
a)Actively growing plant tissue has a high concentration of carbohydrates.
b)Actively growing plant tissue has a relatively thin cuticle layer.
c)Actively growing plant tissue has pre-formed root meristemoids.
d)Actively growing plant tissue is the source of indolebutyric acid.

Answer: a
What is produced by the plant as a stress response to reduce further damage from pests and disease organisms?
a)abscisic acid
b)citric acid
c)jasmonic acid
d)naphthaleneacetic acid

Answer: c
Which is the correct sequence of phases of adventitious root formation?
a)dedifferentiation, root initiation, root primordium formation, and root elongation and/or emergence
b)root elongation and/or emergence, root primordium formation, root initiation, and dedifferentiation
c)root initiation, root elongation and/or emergence, dedifferentiation, and root primordium formation
d)root primordium formation, dedifferentiation, root initiation, and root elongation and/or emergence

Answer: a
Which type of tissue lends itself best to totipotency?
a)corky tissue
b)leaf tissue
c)meristematic tissue
d)root tissue

Answer: c
Geranium stem cuttings form roots at the base of the stem where the cut was made and callus has formed. This is an example of _____ root.
a)a pre-formed
b)a vascular
c)an endogenous
d)an exogenous

Answer: d
Why is a mist of water applied to cuttings at regular intervals between dawn and sunset?
a)to create an environment inhospitable to fungi and bacteria
b)to initiate enzyme activity necessary to stimulate root formation
c)to provide plant cells with protection against direct sunlight
d)to reduce water loss from the plant tissue through transpiration

Answer: d
Why should flowers on the stem of a cutting be removed before sticking?
a)to deter potential insect pollinators
b)to direct energy to root development
c)to stimulate reproductive growth
d)to use for ornamental purposes

Answer: b
Why is agar a common ingredient to tissue culture media?
a)It contains inorganic nutrients.
b)It has a pH range of 5.0 to 6.0.
c)It is comprised of key amino acids.
d)It provides support for plantlets.

Answer: d
How do technicians promote root formation during the third stage of tissue culture?
a)They increase the levels of auxins.
b)They increase the levels of cytokinins.
c)They increase the levels of humidity.
d)They increase the levels of vitamins.

Answer: a