Tropisms
Positive gravitropism is shown by which plant organ?
roots
Hormones cause a plant to do what?
grow in size, stop growing, divide
When a plant receives light from only one direction, what happens?
The dark side of the stem grows faster than the light side of the stem.
Why would a fern, and other seedless plants, have a hard time reproducing in the desert?
Because they need water for their reproduction
Gymnosperms produce spores and seeds inside ___.
cones
What does the ovary of an angiosperm develop into?
fruit
What is the often colorful structure that helps attract insects and birds?
petal
A plant growing toward light source is an example of which tropism?
positive phototropism
Which two hormones most affect the shape of a plant?
auxins and cytokinins
These plants are NOT affected by the length of day/night.
day-neutral plants
What part of a moss plant produces spores?
capsules
Why do gymnosperms need wind for fertilization?
Pollen must travel from the male cones to female cones to fertilize the eggs.
When does a seed germinate?
when the right conditions occur, including right temperature and right moisture level
What is the structure that allows gametes to travel down through the style to the ovary?
pollen tube
Grapevine stems climbing a wood lattice is an example of which tropism?
thigmotropism
Which plant hormone causes shoots and stems to grow by causing their cells to grow?
auxins
Poinsettias need at least 13 hours of darkness to bloom. Poinsettias are ___ plants.
short-day
Which stage of a fern's life cycle do you most often see?
sporophyte
What is the pollen-producing structure on top of the filament?
anther
stamen
Positive tropisms are ___, and negative tropisms are ___. (away/toward)
toward...away
Which hormone causes fruit to ripen?
ethylene
Short-day plants and long day plants are controlled by the length of ___.
night
What is the alternation of generations?
the repeating cycle of gametophyte and sporophyte structures
What is the entire female part of the flower, which includes the stigma and style?
carpel
What is the sticky top of the carpel that receives the pollen?
stigma
Which plant hormone acts as an inhibitor to the other hormones and keeps the plant from growing out of control?
abscisic acid
The blooming of day-neutral plants depends on what conditions?
temperature and moisture
God gave plants two purposes: ___ and ___.
physical needs...beauty
What is the structure that contains one or more ovules at the base of the style?
ovary
What is the leaflike structure around the petals that protects the developing flower?
sepal