Question 1

Meiosis occurs within the

Accepted Answer

A)  petal. 
B)  ovule. 
C)  stigma. 
D)  sepal. 
E)  pollen grain.

Question 2

Grafting experiments

Accepted Answer

A)  established that there is a transmissible factor that can promote flowering, even from plant to plant. 
B)  established that at least one element of the factor is a protein. 
C)  led to the proposal of a flowering hormone. 
D)  established that the factor induced by the inductive photoperiod is stable. 
E)  a, c, and d

Question 3

Sexual reproduction in angiosperms

Accepted Answer

A)  is by way of apomixis. 
B)  requires the presence of petals. 
C)  can be accomplished by grafting. 
D)  gives rise to genetically diverse offspring. 
E)  cannot result from self-pollination.

Question 4

Plants that require vernalization must _______ before flowering can occur.

Accepted Answer

A)  be exposed to cold 
B)  have a source of soil calcium 
C)  experience minimal day length 
D)  have sufficient moisture for a minimum period 
E)  experience one full year of growth

Question 5

Experiments have shown that when a short-day plant (SDP) and a long-day plant (LDP) are grafted together and the SDP is exposed to a photoperiod that causes it to flower, the LDP flowers as well. This observation supports the theory that a specific flower-initiating hormone is produced in plants. A properly controlled experiment would repeat the grafting procedure but

Accepted Answer

A)  graft together the two plants and not induce the SDP. 
B)  omit the LDP. 
C)  omit the SDP. 
D)  shorten the SDP photoperiod. 
E)  include an LDP photoperiod.

Question 6

The advantage of self-fertilization in plants is

Accepted Answer

A)  increased genetic recombination. 
B)  that meiosis can occur. 
C)  greater efficiency of pollination. 
D)  that no flowering is needed. 
E)  that only asexual reproduction is necessary.

Question 7

The megagametophyte of flowering plants consists of the

Accepted Answer

A)  pollen grain. 
B)  pollen tube. 
C)  embryo sac with eight haploid nuclei. 
D)  microspores. 
E)  megasporangium and cells within it.

Question 8

Vernalization

Accepted Answer

A)  is of little importance to agriculture. 
B)  refers to the requirement of the seeds of some plants to be exposed to winter's cold temperatures before they germinate. 
C)  refers to the requirement of some biennial plants to be exposed to winter's cold temperatures before they flower the next spring. 
D)  refers to the induction of cold hardiness of buds. 
E)  Both b and c

Question 9

In a short-day (long-night) plant with a critical day length of 15 hours, flowering would be induced by _______ hours of light alternating with _______.

Accepted Answer

A)  12; 12 hours of darkness 
B)  16; 8 hours of darkness 
C)  14; 8 hours of darkness 
D)  8; 8 hours of darkness 
E)  15; 9 hours of darkness, interrupted by one short burst of white light

Question 10

The advantage of cross-fertilization in plants is

Accepted Answer

A)  increased genetic recombination. 
B)  that meiosis can occur. 
C)  greater efficiency of pollination. 
D)  that no flowering is needed. 
E)  that it requires less energy to accomplish than self-fertilization.

Question 11

Plants with wind-pollinated flowers tend to have

Accepted Answer

A)  colorful petals. 
B)  smooth stigmas. 
C)  large quantities of pollen. 
D)  large quantities of nectar. 
E)  pollination before the bud opens.

Question 12

Much effort is spent detasseling corn (removing male flowers). Why doesn't it work simply to spray the corn plants with a meiosis inhibitor to halt pollen production? (Hint: Male and female flowers occur on the same corn plant.)

Accepted Answer

The answer of Much effort is spent detasseling corn (removing...

Question 13

Short-day plants bloom

Accepted Answer

A)  in the spring. 
B)  in the fall. 
C)  in the summer. 
D)  only after a cold winter. 
E)  only after the second year of life.

Question 14

Which of the following is found in the highest concentration in dormant (inactive) buds and seeds?

Accepted Answer

A)  Abscisic acid 
B)  Auxin 
C)  Cytokinin 
D)  Ethylene 
E)  Gibberellin

Question 15

Which of the following is the "suspensor"?

Accepted Answer

A)  The pollen tube 
B)  The organ supporting the ovule 
C)  The base of the flower 
D)  The narrow part of the embryo 
E)  The stalk of the stamen

Question 16

Angiosperms are unique in that the number of chromosome sets in the endosperm is _______.

Accepted Answer

The answer of Angiosperms are unique in that the number...

Question 17

In flowering plants, fertilization occurs

Accepted Answer

A)  where pollen lands on the stigma. 
B)  where the pollen tube germinates. 
C)  inside the pollen tube. 
D)  at the base of the embryo sac. 
E)  inside the seed.

Question 18

Most wine grape vines are grafted onto rootstock of another species. How does this practice increase grape yields?

Accepted Answer

A)  A hardy rootstock can replace a weak rootstock. 
B)  A high-producing vine stock can replace a low-producing vine stock. 
C)  It allows vintners to select for pest resistance without losing grape quality. 
D)  All of the above 
E)  None of the above

Question 19

Angiosperms are characterized by double fertilization, in which one sperm nucleus fertilizes the _______ to begin formation of the embryo, and the other fertilization results in production of _______ tissue.

Accepted Answer

The answer of Angiosperms are characterized by double fertilization, in...

Question 20

The two cells in a mature pollen grain are formed by

Accepted Answer

A)  one meiotic division and one mitotic division. 
B)  two meiotic divisions and one mitotic division. 
C)  one meiotic division and two mitotic divisions. 
D)  two meiotic divisions and two mitotic divisions. 
E)  one meiotic division in which one of the four cells degenerates.

Exam 38: Reproduction in Flowering Plants