Quark 2

Front 1

the source of the oxygen which is produced during photosynthesis has been traced using radioactive isotopes the oxygen comes from----- which is split during the ------

Back 1

b. water..... light reactions

Front 2

which of the following statements is true about the movement of plants onto land

Back 2

d. only a and c are correct

plants and fungi coevolved on land
when plants moved onto land, they did so with changes that prevented or reduced desiccation

Front 3

plants exhibit all of the following shared derived characters except

Back 3

b. chlorophyll

Front 4

which of the following is not an organ shared by all vascualar plants

Back 4

a. flowers

Front 5

which tissue in plants is responsible for most of the metabolic functions in the plant

Back 5

c. ground

Front 6

totipotency is a term used to describe the ability of a cell to give rise to a complete new organism. in plants this means that

Back 6

c. cell defferentiation depends largely on the control of gene expression

Front 7

a hypothetical angiosperm opens its flower only at night. the flowers are brown and emit a putrid oder. the pollinatory is most likely to which organism

Back 7

e.detrivorus (scavenging) animal

Front 8

how have fruits contributed to the sucess of angiosperms

Back 8

b. by faciliting dispersal of seeds

Front 9

the ------ is dominant in mosses while the ----- is dominant in ferns and seed plants

Back 9

a. gametophyte.... sporophyte

Front 10

double fertilization means that angiosperms

Back 10

c. have two sperm nuclei both of which unite with nuclei of the female gametophyte

Front 11

how have plants adapted to their inability to move in the presence of predators or poor growing conditions or enviromental changes

Back 11

e. all three are true

retain plastticity throughout their lives
grow toward stimuli
defenses against predators

Front 12

if a certain plant is biennial and only flowers in its second year of life which of the following is true

Back 12

d. both a and b are true

its roots may serve as a sugar sink during the first growing season

its roots may serve as a sugar sink during the second growing season

Front 13

in most plants the majority of the CO2 uptake occurs in ---- cells in leaves and these cells are examples of----- tissues

Back 13

a. mesophyll....ground

Front 14

photorespiration can occur because

Back 14

c. rubisco can accept either oxygen or carbon dioxide

Front 15

CAM plants perfor carbon fixation in----- while C4 plants perform carbon fixiation in-------

Back 15

e. both a and d are correct

nightime..different types of cells

mesophyll...bundle sheath cells

Front 16

as water moves from roots to leaves most movement is through

Back 16

e. both a and d are correct

bulk flow
xylem

Front 17

in plant roots the casparian strip is correctly described by which of the following

Back 17

d. it ensures that all water and dissolved substances must pass through a cell vefore entering the stele

Front 18

which of the following has the lowest (most negative water potential

Back 18

e. leaf air spaces

Front 19

what is the main force by which most of the water with the xylem vessels moves towards the top of a tree

Back 19

c. evaporation of water through stoma

Front 20

assume that a particular chemical interferes with the establishment and maintance of proton gradients across the membranes of plant cells. all of the following processes would be directly affected by this chemical except

Back 20

c. xylem transport

Front 21

which of the following experimental procedures would most likely reduce transpiration while allowing normal growth of a plant

Back 21

b. increasing the level of carbon dioxide around the plant

Front 22

water flows into the source end of a sieve tube because

Back 22

b. sucrose has been actively transported into the sieve tube

Front 23

the water loss during transporation is an unfortunate side effect of the plant's exchange of gasses. however, the plant derives some benefit from this water loss in the form of

Back 23

d. both answers are correct

evaporative cooling
increased turgor

Front 24

which of the following is not part of the transpiration-cohesion-tension mechanism for the ascent of xylem sap

Back 24

d. the active pumping of water into the xylem of roots

Front 25

what are epiphytes

Back 25

d. plants that grow on other plants but do not obtain nutrients from their hosts

Front 26

what is typically the result of double fertilaization in angiosperms

Back 26

c. both a diploid embryo and a triploid endosperm are formed

Front 27

if a legume is infected with Rhizobium, what is the probale effect on the plant

Back 27

d. it obtains nitrogen from nitrogen fixation

Front 28

which of the followinf vegetables is botanically a fruit

Back 28

e. green beans

Front 29

fruits develope from

Back 29

d. ovaries

Front 30

the first step in germination of a seed is usually

Back 30

c. imbibition

Front 31

plant hormones can be characterized by all of the following except

Back 31

c. function independetly of other hormones

Front 32

plants often use changes in day lenght to trigger events such as dormancy and flowering

Back 32

a. are more predicatble than air temperture changes

Front 33

which of the following are examples or parts of plants systemic acquired resistance against infection

Back 33

d. all three answers are correct

phtoalexins
salicylic acid
alarm hormones

Front 34

compenent of chlorophyll

Back 34

magnesium

Front 35

maor solute involved in water balance and stomata operation

Back 35

potassium

Front 36

component of nucleic acids, proteins and coenzymes

Back 36

nitrogen

Front 37

component of cyctochromes

Back 37

iron

Front 38

compentat of atp ,phospholipids and nucleic acid

Back 38

phosphorus