A hormone induced dropping of leaves, flowers, fruits or other parts of a plant is:
A seed leaf is a:
D. leaf primordia
The fusion of a sperm nucleus with the egg nucleus and the fusion of another sperm nucleus with the nuclei of the endosperm is:
A mature ovary, with or without accessory parts is a:
Resumption of growth after dispersal, dormancy, or both is called:
The enlarged base of one or more carpels is the :
The tissue mass in a plant ovary that develops into a seed is the:
Immature or mature, sperm bearing male gametophyte of a Gymnosperm or Angiosperm is a :
A. pollen grain
Arrival of a pollen grain on the landing platform (Stigma) of a carpel is called:
A mature ovule with an embryo sporophyte inside and integuments that form a seed coat is a :
D. pollen grain
Cells in sacs in the anthers undergo meiosis and cytoplasmic divisions to produce haploid _____________ ,which go on to become pollen grains.
C. mother cells
The flowers of species that have both male and female parts are called ______________ flowers.
Plants exhibit _____________ when they turn their leaves or stems toward the light.
C. light dependency
What is the name of the blue-green pigment molecule that is one of the "alarm buttons" for some biological clocks in plants?
A________________ rhythm is a biological activity that recurs in cycles of 24 hours or so.
What plant hormone is redistributed within a plant to cause the bending of plants in response to light?
Generally, gravity-sensing mechanisms are based on _________ which are heavy or dense particles that shift position in response to changes in a cell's orientation in space.
Tendrils display ____________ when they shift their direction of growth upon contacting a solid object.
Generally, gravity-sensing mechanisms are based on
a. phytochrome inactivation
b. statolith movement
c. accumulation of ethylene
d. differential gene expression
A perfect flower
a. lacks a stamen
b. lacks a carpel
c. has both male and female reproductive parts
Double fertilization occurs only in
a. tissue cultures
When plants shift their growth in response to contact with an object, they show
Which of the following statements about endosperm is not correct?
a. it is formed in the stamens
b. it is triploid
c. it serves as nutrition for the embryo
d. it is present only in angiosperms
A poinsettia, which must be guarded from excess light in order to induce flowering, is an ex of a
a. day-neutral plant
b. short-day plant
c. long-day plant
A(n) ______ is a multiple fruit; it is derived from a number of individual flowers that were grouped close together.
When a plant stops growing under conditions that seem (to us) suitable for growth, we say that it has entered into :
Which of the following promotes fruit ripening and abscission?
a. indolacetic acid (IAA)
d. none of the above
a. is a blue-green plant pigment
b. is interconverted between active and inactive forms by variations in the wavelength of light
c. plays a role in maintaining plant circadian rhythms
d. all of the above
Which of the following is not a fruit?
What plant pigment is suspected of playing a major role in phototropic bending?
The "foolish seedling" effect results from exposure of a plant to an artificially high level of
Indolacetic acid (IAA) is a naturally occurring
In ______, a new plant is induced to arise from a parent cell that has not become irreversibly differentiated.
b. genetic engineering
c. tissue culture propagation
d. sexual reproduction
Strawberries can reproduce vegetatively by
In ______, the embryo absorbs nutrients from the endosperm and stores them in its cotyledons.
A ______ is a localized region of still embryonic cells that retain the potential for division.
When a pollen tube reaches an ovule, it penetrates the embryo sac and delivers
a. a single sperm
b. two sperm
c. the endosperm mother cell
d. an egg
a. is a type of auxin
b. promotes cell elongation
c. induces bud dormancy
d. causes the foolish seedling effect
a. are responsible for circadian rhythms
b. stimulate cell division
c. are synthesized in leaves and transported to roots
d. are activated by red light
Food distributors expose fruit to ethylene in order to
a. retard spoilage
b. kill insects
c. promote ripening
d. prevent seed formation