What process creates low pressures needed for movement of water upwards in xylem?

evaporation of water from mesophyll of leaves

How does phytochrome control flowering in plants?

Pr turn into Pfr in the light, causing LDP to flower

Which of the following helps in supporting a terrestrial woody plant?

xylem tissue and turgor pressure

Which pair correctly describes how fluids are transported in the xylem and phloem?

xylem away from root only and phloem moves both directions

When a farmer sprays a chemical on crop plants, how does it travel to the roots of the plant?

in the phloem by active translocation

What treatment is most likely to lead to germination?

soaking the seeds in a solution of gibberellins

Which sequence is correct in the reproduction of a flowering plant?

pollination - fertilization - seed dispersal

What conditions will cause the highest rate of transpiration in a well-watered plant?

low humidity, hot, bright sunshine and windy

What causes movement of water through the xylem?

evaporation of water from leaves

Which direction does the phloem transport materials?

up and down the plant all the time

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Plant Biology - IB Bio HL 2016

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Chapter 9

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Questions 20

Answers

1
What process creates low pressures needed for movement of water upwards in xylem?
active transport
evaporation of water from mesophyll of leaves
active translocation
evaporation of water from guard cells
2
How do mineral ions in the soil move to the root through the soil?
through phloem
mass flow of water
osmosis
translocation
3
During seed germination, what carbohydrate moves from cotyledons to the embryo?
starch
fructose
maltose
sucrose
4
How does phytochrome control flowering in plants?
Pr turns into Pfr in the dark, causing SDP to flower
Pfr turns into Pr in the light, causing SDP to flower
Pfr turn into Pr in the dark, causing LDP to flower
Pr turn into Pfr in the light, causing LDP to flower
5
Which of the following helps in supporting a terrestrial woody plant?
turgor pressure and phloem tissue
xylem tissue and turgor pressure
all of the above
xylem tissue only
6
What generates new cells in dicotyledonous plants?
apical and lateral meristems
apical meristems
phloem, apical and lateral meristems
lateral meristems
7
Which pair correctly describes how fluids are transported in the xylem and phloem?
xylem away from root only and phloem toward root only
xylem away from root only and phloem moves both directions
phloem toward root only and xylem moves both directions
xylem towards root only and phloem away from root only
8
Which process is directly assisted by the brightly colored flowers to attract animals?
seed dispersal
fertilization
germination
pollination
9
When a farmer sprays a chemical on crop plants, how does it travel to the roots of the plant?
in the phloem by transpiration pull
in the xylem by active translocation
in the xylem by transpiration pull
in the phloem by active translocation
10
What treatment is most likely to lead to germination?
soaking the seeds in a solution of gibberellins
increasing CO2 concentration
dehydrating the seeds
increasing light intensity
11
Which sequence is correct in the reproduction of a flowering plant?
pollination - fertilization - seed dispersal
seed dispersal - fertilization - pollination
seed dispersal - pollination - fertilization
fertilization - pollination - seed dispersal
12
What conditions will cause the highest rate of transpiration in a well-watered plant?
windy, bright sunshine, humid and cool
low humidity, hot, bright sunshine and windy
hot, humid with bright sunshine and still air
windy, hot, cloudy and humid
13
Which of the following is found on the inner ring of vascular tissue in a dicot?
xylem : transport of sugars
phloem : gas exchange
phloem : storage of water and starch
xylem : mechanical support
14
What causes stomata to close?
increase in the turgor of the guard cells
a high level of CO2 in the leaf tissue
movement of K+ into the guard cells
the presence of abscisic acid
15
What causes movement of water through the xylem?
active translocation
gravity
evaporation of water from leaves
active transport in the root tissue
16
Which of the following are features of dicotyledonous plants?
flower parts in groups of three and two seed leaves
all of the above
two seed leaves
parallel leaf veins and flower parts in groups of three
17
Which plant hormone is responsible for the closing of the stomata?
gibberellic acid
abscisic acid
phytochromes
ethylene
18
In flowering plants, which of the following helps seed dispersal?
bees
pollen
germination
mammals
19
Which direction does the phloem transport materials?
up the plant at night and down the plant during the day
up and down the plant all the time
up the plant only
down the plant only
20
Which would be an adaptation of xerophytes?
large numbers of stomata
hairs on the leaves
large air spaces
reduced roots

Plant Biology - IB Bio HL 2016 Flashcards | StudBud