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IB Plant Biology-NEW 2025 Flashcards | StudBud
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IB Plant Biology-NEW 2025
IB Plant Biology-NEW 2025
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1
Areas of undifferentiated plant cells that are actively dividing are called
meristems
epidermal
vascular
determinate
2
What part of a plant is shown here?
trunk
root
leaf
stem
3
As solute concentration increases, water potential ________________.
becomes zero
increases
remains the same
decreases
4
What process allows the transport of water into the roots of plants?
translocation
phloem loading
osmosis
active transport
5
What process creates the low pressure needed for transpiration?
evaporation from guard cells
evaporation from mesophyll
active translocation
active transport
6
Which phytohormone is matched correctly?
cytokinin-produces digestive enzymes
auxin-fruit ripening
ethylene-tropisms
gibberelin-promotes lateral growth
7
A plant root is
negatively phototropic
stimulated only by water
positively phototropic
negatively geotropic
8
Water molecules are attracted to each other, which is called
hydrolysis
cohesion
hydrophilic
adhesion
9
What is structure F?
sink cell
source cell
sieve tube
sieve plate
10
Plants transport organic compounds from
sources to sinks
sinks to sources
xylem to phloem
roots to shoots
11
Which of the following will DECREASE the rate of transpiration?
high humidity
warmer temps
windy
light
12
What is structure 7?
xylem
stomata
guard cell
phloem
13
Transpiration is best defined as
transport of sugars through the plant
osmosis of water into root hairs
production of food in a plant
loss of water vapor from the leaves
14
Water potential is greatest at which location?
roots
leaves
trunk
atmosphere
15
What term describes stem cells that have the potential to develop into any part of an organism?
determinate
totipotent
apical
Indeterminate
16
Carbohydrates in the phloem are mainly in this form.
fructose
starch
glucose
sucrose
17
The movement of sugars from the source to the sieve tube cells of the phloem is called
phloem loading
passive transport
transpiration
translocation
18
Which is paired correctly?
apoplast : plasmodesmata
phloem : transpiration
symplast : plasmodesmata
xylem : living cells
19
Which part is the phloem?
A
B
C
D
20
Positive feedback means a stimulus causes increased movement in the same direction. Which is an example of this?
negative phototropism
negative geotropism
fruit ripening/ethlylene production
cross-pollination
21
What is structure C?
ground meristem
primordial leaf
axillary bud
meristem
22
What is structure B?
anther
filament
style
stigma
23
Pollinators and flowering plants have a relationship described as
commensalism
symbolism
competition
mutualism
24
Which is true about transpiration?
it transports substances in various directions in the plant
it is a passive process
it occurs in the phloem
It is an active process
25
High solute concentration in the roots is maintained by which process?
transpiration
evaporation
osmosis
active transport
26
What part of the flower will develop into the fruit?
ovary
ovule
style
stigma
27
Which structure will pollen stick to?
A
D
B
C
28
The energy required for transpiration comes from
high pressure in the xylem
glucose
ATP
solar energy
29
Water from transpiration exits the plant through the
stomata
palisade
guard cells
spongy
30
Which is the correct equation for water potential?
Water potential = solute potential - pressure potential
Water potential = solute potential X pressure potential
Water potential = solute potential + pressure potential
Water potential = solute potential/pressure potential
31
What is the function of lignin in xylem?
pulls water up from roots
moves water against its gradient
active transports sugars
strength & support
32
What is structure C?
xylem
phloem
companion cell
sieve plates
33
In the picture shown, where is the xylem?
C
A
B
D
34
Which structure is the shoot apical meristem?
C
B
D
A
35
Which of the following is true?
The ovary develops into a seed.
A pollen tube grows from each pollen grain on a stigma.
Seed dispersal increases competition between offspring and parent plants.
The ovules develop into a fruit.
36
Which of the following is true about Auxin?
Auxin production in shoots inhibits growth
Auxin production in shoots moves toward light
Auxin production in shoots moves toward shade
Auxin production in roots moves away from gravity
37
Which is true?
Water moves from low pressure to high
High water potential = hypertonic
Water moves from high solute concentration to low
Water moves from an area of high potential to lower potential
38
Which of the following is an example of a source?
developing fruits
developing seeds
roots
mature leaves
39
What is shown in this picture?
plant shoot
phloem tube
leaf cross section
plant root
40
How does transpiration happen?
By osmosis from roots to leaves
Diffusion from high to low water concentration
By active transport with energy from the sun.
Flow of water under tension with cohesion between water molecules
41
Meristems at the ends or tips of shoots and roots are
apical
intermediate
differentiated
lateral
42
Which phytohormone interacts with auxin to integrate shoot growth?
ethylene
cytokinin
gibberelin
jasmonic acid
43
Which part is the meristem?
B
A
C
44
What is shown in the picture?
plant shoot
leaf cross section
cactus
plant root
45
Auxin is a phytohormone. Which of the following is NOT a way that auxin plays a role in phototropism of shoots.
causes cells on the dark side to grow faster
auxin makes cells enlarge
auxin is produced in the meristem of the shoot
auxin moves to the side of the stem with the most light
46
The transport of organic solutes through the phloem of a plant is called
osmosis
translocation
transpiration
respiration
47
A decrease in pH (more acidic) causes
more auxin to be produced
less auxin to be produced
the bonds in cell wall to strengthen
the bonds in the cell wall to break
48
Which self-incompatibility alleles would most likely result in successful reproduction?
S1S2 and S3S4
S1S2 and S2S3
S3S4 and S3S4
S1S2 and S1S2
49
Auxin promotes the synthesis of _______________, which _____________ pH.
cytokinins; decreases
cytokinins; increases
proton pumps; increases
proton pumps; decreases
50
Which is NOT a characteristic of phloem?
dead cells
companion cells
transport food
transport in two directions
51
Which part of a plant is shown?
trunk
stem
leaf
root
52
Cross-pollination causes
decreased genetic variation
increased genetic variation
inbreeding
increase in recessive diseases
53
This phenomenon is a result of increased auxin production near apical meristems.
apical dominance
flowering
lateral inhibition
secondary growth
54
_____________________________ is the inevitable consequence of gas exchange in the leaf.
transpiration
respiration
photosynthesis
translocation
