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Campbell Biology

Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson

Chapter 38

Angiosperm Reproduction and Biotechnology - all with Video Answers

Educators

Chapter Questions

02:21

Problem 1

A fruit is
a. a mature ovary.
b. a mature ovule.
c. a seed plus its integuments.
d. an enlarged embryo sac.

Stephanie Schmidt
Stephanie Schmidt
Numerade Educator
01:45

Problem 2

Double fertilization means that
a. flowers must be pollinated twice to yield fruits and seeds.
b. every egg must receive two sperm to produce an embryo.
c. one sperm is needed to fertilize the egg, and a second sperm is needed to fertilize the polar nuclei.
d. every sperm has two nuclei.

Stephanie Schmidt
Stephanie Schmidt
Numerade Educator
02:22

Problem 3

"Golden Rice"
a. is resistant to various herbicides, making it practical to weed rice fields with those herbicides.
b. contains transgenes that increase vitamin A content.
c. includes bacterial genes that produce a toxin that reduces damage from insect pests.
d. produces larger, golden grains that increase crop yields.

Stephanie Schmidt
Stephanie Schmidt
Numerade Educator
02:25

Problem 4

Which statement concerning grafting is correct?
a. Stocks and scions refer to twigs of different species.
b. Stocks and scions must come from unrelated species.
c. Stocks provide root systems for grafting.
d. Grafting creates new species.

Stephanie Schmidt
Stephanie Schmidt
Numerade Educator
03:11

Problem 5

Some dioecious species have the XY genotype for male and XX for female. After double fertilization, what would be the genotypes of the embryos and endosperm nuclei?
a. embryo XY/endosperm XXX or embryo XX/endosperm XXY
b. embryo XX/endosperm XX or embryo XY/endosperm XY
c. embryo XX/endosperm XXX or embryo XY/endosperm XYY
d. embryo XX/endosperm XXX or embryo XY/endosperm XXY

Stephanie Schmidt
Stephanie Schmidt
Numerade Educator
01:34

Problem 6

A small flower with green petals is most likely
a. bee-pollinated.
b. bird-pollinated.
c. bat-pollinated.
d. wind-pollinated.

Stephanie Schmidt
Stephanie Schmidt
Numerade Educator
01:57

Problem 7

The black dots that cover strawberries are actually fruits formed from the separate carpels of a single flower. The fleshy and tasty portion of a strawberry derives from the receptacle of
a flower with many separate carpels. Therefore, a strawberry is
a. a simple fruit with many seeds.
b. both a multiple fruit and an accessory fruit.
c. both a simple fruit and an aggregate fruit.
d. both an aggregate fruit and an accessory fruit.

Stephanie Schmidt
Stephanie Schmidt
Numerade Educator
02:31

Problem 8

Draw and label the parts of a flower.

Stephanie Schmidt
Stephanie Schmidt
Numerade Educator
02:31

Problem 9

With respect to sexual reproduction, some plant species are fully self-fertile, others are fully self-incompatible, and some exhibit a "mixed strategy" with partial self-incompatibility. These reproductive strategies differ in their implications for evolutionary potential. How, for example, might a self-incompatible species fare as a small founder population or remnant population in a severe population bottleneck (see Chapter 23 ), as compared with a self-fertile species?

James Thierer
James Thierer
Numerade Educator
02:13

Problem 10

Critics of GM foods have argued that transgenes may disturb cellular functioning, causing unexpected and potentially harmful substances to appear inside cells. Toxic intermediary substances that normally occur in very small amounts may arise in larger amounts, or new substances may appear. The disruption may also lead to loss of substances that help maintain normal metabolism. If you were your nation's chief scientific advisor, how would you respond to these criticisms?

Stephanie Schmidt
Stephanie Schmidt
Numerade Educator
02:06

Problem 11

Humans have engaged in genetic manipulation for millennia, producing plant and animal varieties through selective breeding and hybridization that significantly modify genomes of organisms. Why do you think modern genetic engineering, which often entails introducing or modifying only one or a few genes, has met with so much opposition? Should some forms of genetic engineering be of greater concern than others? Explain.

Stephanie Schmidt
Stephanie Schmidt
Numerade Educator
05:09

Problem 12

In a short essay $(100-150$ words), discuss how a flower's ability to reproduce with other flowers of the same species is an emergent property arising from floral parts and their organization.

Heather Thornton
Heather Thornton
Numerade Educator
03:01

Problem 13

(a) What is a pollen grain? (b) How does it form? (c) What is its function, and how does it accomplish this function? (d) In an evolutionary context, why was pollen an important step in allowing seed plants to become the dominant plants?

Matthew Bradley
Matthew Bradley
Numerade Educator