Discuss how variation in chromosome number has been useful inagriculture.

Figure 14.19 At what stage does the diploid zygote form? a. When the female cone begins to bud from the tree b. When the sperm nucleus and the egg nucleus fuse c. When the seeds drop from the tree d. When the pollen tube begins to grow

In plant life cycles, (a) the first products of meiosis are gametes (b) spores are part of the diploid sporophyte generation (c) the embryo gives rise to a zygote (d) the first stage in the diploid sporophyte generation is the zygote (e) the first stage in the haploid gametophyte generation is the prothallus

In bryophytes, eggs are fertilized in a chamber on the ________ and a zygote develops into a _______. a. sporophyte; gametophyte b. gametophyte; sporophyte c. sorus; cone

The waxy layer that covers aerial parts of plants is the (a) cuticle (b) archegonium (c) protonema (d) stoma (e) thallus

In an angiosperm life cycle, sexual reproduction includes: meiosis within the male gametophyte to produce sperm. meiosis within the female gametophyte to produce eggs. meiosis within the ovary to produce megaspores. fertilization leading to development of microspores. fertilization leading to development of megaspores.

Seeds are mature _______ ; fruits are mature_______ . a. ovaries; ovules c. ovules; ovaries b. ovules; stamens d. stamens; ovaries

Which of the following traits characterizes gymnosperms? a. The plants carry exposed seeds on modified leaves. b. Reproductive structures are located in a flower. c. After fertilization, the ovary thickens and forms a fruit. d. The gametophyte is longest phase of the life cycle.

Meiosis of cells in pollen sacs forms haploid _________. a. megaspores b. microspores c. stamens d. spomphytes

How does a haplontic plant population maintain genetic diversity? Zygotes are produced by random fusion Gametes are created through meiosis Diploid spores undergo independent assortment during mitosis The zygote undergoes meiosis to generate a haploid sporophyte.