Chapter 30 - Mastering Biology

Ovules are found within structure _____. The figure shows a flower. Each letter marks definite structure of the flower. Letter A marks structures similar to leaves in the base of the flower. Letter B marks the structure that contains female reproductive cells. Letter C marks modified leaves that surround the reproductive parts of flowers. Letter D marks the upper part of stamen, which has two lobes. Letter E marks the cell, which is located in a low thickened part of carpel. Ovules are found within structure _____. A B C D E

B (Ovules are housed within ovaries.)

After fertilization, the ovule develops into a seed. Can you match the parts of the ovule with the corresponding parts of the seed? Drag the terms on the left to the appropriate blanks on the right to complete the sentences. fertilized egg integument megaspore After fertilization of the ovule, the a.)____________ develops into the food supply of the mature seed. After fertilization of the ovule, the b.)____________ develops into the seed coat. After fertilization of the ovule, the c.)____________ develops into the embryo of the mature seed.

a.)megapore b.)integument c.)fertilized egg (A seed includes three generations of the plant life cycle. The seed coat develops from diploid tissues of the parent sporophyte in the integument. The food supply is derived from female gametophyte tissue of the megaspore. And the embryo, which carries genetic information from the egg and the sperm, is the new diploid sporophyte generation.)

A stamen consists of _____. stigma and filament; stigma and style; ovary and sepal; anther and filament; stigma and anther;

anther and filament

Which of these is unique to flowering plants? haploid gametophytes, an embryo surrounded by nutritive tissue, double fertilization, a dominant sporophyte generation, pollen production

double fertilization (In flowering plants one sperm nucleus fertilizes the egg and the other sperm nucleus fuses with two other nuclei found within the ovule, thus forming triploid endosperm.)

Can you identify the ploidy of different structures? Drag the terms on the left to the appropriate blanks on the right to complete the sentences. Terms may be used once, more than once, or not at all. diploid haploid polyploid The gametophyte generation is ___________. The megaspore is __________. The sporophyte generation is ___________. The embryo is __________.

haploid, haploid, diploid, diploid (The sporophyte generation, which is diploid, gives rise to the gametophyte generation, which is haploid, through meiosis.)

Which of the following contains multiple gymnosperm ovules? megasporangium, megaspore, integument, or ovulate cone

ovulate cone (An immature ovulate cone contains multiple ovules. An ovulate cone will become a mature gymnosperm cone after all of the ovules mature into seeds.)

The male gametophytes of flowering plants are also referred to as _____. male sporophytes, embryo sacs, endosperm, pollen grains, megaspores

pollen grain

In flowering plants the integuments of the ovule develop into a(n) _____. cotyledon, seed coat, endosperm, sporophyte, fruit

seed coat (The integuments of the ovule develop into a tough seed coat.)

What are the main components of a mature gymnosperm seed? Select all that apply. seed coat, ovule, pollen grain, megasporangium, food supply, megaspore, embryo

seed coat, food supply, embryo (A mature seed contains food and protection for the new diploid sporophyte generation (the embryo). Eventually, the seed may germinate, giving rise to a mature sporophyte.)

In angiosperms, pollination is the transfer of pollen grain to the _____ of a flower on the same plant or another plant of the same species. anther; style; stigma; ovary; ovulate cone;

stigma (Pollen sticks to the sticky stigma.)

A carpel is composed of _____. ovule, megasporocyte, and anther; zygote, anther, and endosperm; petal, sepal, and stamen; ovary, ovule, and anther; stigma, style, and ovary;

stigma, style, and ovary

Which of the following is found inside a pollen grain? the female gametophyte, the male gametophyte, the megaspore, the sporophyte

the male gametophyte (A pollen grain contains the male gametophyte. Pollination of the ovule begins the process of fertilization, which results in the merging of the haploid male and female gametophytes to form a diploid zygote.)