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bio

Terms in this set (40)

Vessel elements
In angiosperms, xylem consists of tracheids and ?
roots
When a plant moves sugars from its leaves to its roots, the sink is in the
Epiphytes
Plants that obtain some or all of their nutrients directly from a host plant are
water
Which of the following is NOT an essential plant and mineral nutrient?
Produce their own food
Epiphytes differ from parasites in that epiphytes
stoma
In figure 21-1 the X points to a
guard cells is high
In figure 21-1 the water pressure in the
nitrogen
When a carnivorous plant captures and digests insects, the most important result is that it gains additional
conduct water to the leaves
If some of the xylem of a young oak tree were destroyed, it would most likely interfere with the tree's ability to
stomata
Oxygen and carbon dioxide diffuse in and out of a leaf through the
Cause less water to be pulled up from the plant's roots
The closing of a plant's stomata will
flower
A plant that is magnesium deficient is unable to
light if the plant has enough water
The stomata of leaves are usually open in
nitrogen
which of the following is absorbed by most plants in ionic form from the soil?
calcium
which of the following is NOT one of the three mineral nutrients most commonly deficient in farm and garden soils?
plant hormones
plants can respond to changing environmental conditions through chemical messengers called
auxins
plant hormones that stimulate cell elongation and are produce in the rapidly growing region near the tip of the plant's root or stem are called
Gibberellins
what plant hormones promote stem growth and the development of fruits
stimulate cell devision
cytokinins differ from auxins in tha cytokinins
Photoperiodism
the response of a plant to changes in the length of day or night is called
Tropisms
growth responses that cause parts of a plant to grow slowly toward or away from a stimulus are called
Phototropism
what is the phenomenon that is causing the bean seedling to bend in figure 22-1
Grow roots into the soil
gravitropism ensures that the plant in figure 22-1 will
Lose ability to move phototropically
the apical meristems of a mature plant is removed, the plant will most likely
Length of uninterrupted darkness
flowering in many plants is dependent on the
formancy
a period of decreased activity uring which a plant stops growing is called
flowers
in the prickly pear cactus shown in figure 22-2 photosynthesis takes place in the
It has an extensive shallow root system
what adaptation is the cactus in figure 22-2 enables it to soak up rainfall quickly?
Its stems swell and store water
how does the cactus in figure 22-2 adapted to survive long dry periods?
signals from the environment
an organism's "biological clock" is set by
false, sieve tube
Phloem consists of VESSEL members and companion cells
false, diffusion
The high concentration of minteral ions in plant cells causes water molecules to move into the plant by TRANSPIRATION
false, close
when the guard cells of a leaf lose water, the stomata OPEN
true
water rises to the top of a giant redwood tree by TRANSPIRATION PULL
true
about 80 percent of a nonwoody plant's mass consists of WATER
false, hormones
plants have ENZYMES that direct, control, and regulate their growth
true
growth in lateral branches of a plant is stimulated by CYTOKININS
false, thigmotropism
the growing tip of a clibing vine exhibits PHOTOTROPISM when it grows in a circling motion around a wire
false, short day
LONG DAY plants flower when nights are long
false, light
the critical day length for a plant indicates the number of hours of DARKNESS a plant requires to produce flowers
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