Exam 37: Reproduction in Flowering Plants

Poinsettias are popular ornamental plants that typically bloom just before Christmas.Their flowering is photoperiodically controlled.Are they long-day or short-day plants? Explain.

Refer to the figure showing the initial stage of double fertilization. The second sperm in double fertilization fuses with what other cell(s) in the embryo sac?

The process of grafting involves

Refer to the figure showing the initial stage of double fertilization. Identify the cell(s) of the embryo sac or pollen tube that do(es) not participate in double fertilization.

The genes responsible for self-incompatibility mediated by the style are collectively called the _______ locus.

Florigen is a plant hormone actively involved in the initiation of flower formation.Draw a flowchart showing its mechanism of action, including the interaction of the three genes involved in initiating flower formation.

Which protein(s) is/are most directly and physically involved in turning on gene expression for the transition to flower production?

Once a plant is stimulated to flower, what type of genes initiate the transition to flower formation?

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

The two cells in a mature pollen grain are formed by

In general, the production of progeny with genotypes identical to the parental genotype is called asexual reproduction; self-fertilization is a form of _______ reproduction.

Annuals, biennials, and perennials differ most importantly in when and how many times they

To stage long-day plants so they will produce blooms for a flower show, what can a greenhouse manager provide to the plants to prevent flowering?

Angiosperm seeds develop

Some wind-dispersed seeds use _______ to help them travel.

Which sentence best describes florigen and how it acts at the apical meristem?

In the production of female gametophytes, only _______ megaspores complete(s) development.

Asexual reproduction is the best strategy for plants

Which event is most likely to take place on the style in a flower that normally lacks an expanded terminal stigma?

Grafting experiments established that