Tropisms
Which plant organ demonstrates POSITIVE GRAVITROPISM?
a. flowers b. leaves c. roots d. stems
c. roots
The male part of the flower
Stamen
Which plant hormone causes cells to divide?
cytokinins
Seedless plants require _________ for reproduction.
Water
Why would ferns have a hard time reproducing in the desert?
Lack of water for the sperm to swim to the eggs and fertilize them.
Grapevine stems climbing a wood lattice is an example of __________.
Thigmotropism
The female part of a flower
Carpal
Which hormone causes fruit to ripen?
Ethylene
What part of a moss plant produces spores?
The ovary of an angiosperm develops into what?
Fruit
If a plant is growing toward a stimulus, which kind of tropism is that?
Positive tropism
Part of the flower that produces pollen
Anther
Which hormone acts as an inhibitor to the other hormones?
abscisic acid
The repeating cycle of gametophyte and sporophyte structures is called _________________________.
Alternation of generations
Gymnosperms produce spores and seeds inside _____.
Cones
The stem of a flower is are demonstrating positive ________.
Phototropism
Leaflike structures outside the petals
Sepal
Which two hormones most affect the shape of a plant?
auxins and cytokinins
Why do gymnosperms need wind for reproduction?
To carry the pollen from the male cones to the female cones.
Which type of plant is not affected by the length of day?
Day-neutral
When a flowerpot tips over, and the plant starts to grow upwards instead of sideways, which type of tropism is this?
Negative gravitropism
The stigma, style, and ovary make up this part of the flower
Carpal or female
When a plant receives light from only one direction, hormones cause what to happen?
The dark side of the stem to grow faster that light side of the stem.
When does a seed germinate?
With the correct temperature, moisture, and other conditions
Which type of plant flowers when the nights are shorter than it's critical night length?