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Campbell Mastering Biology Chapter 30 Questions

front 1

Which of the following adaptations is common to all seed plants?

back 1

-heterospory
-ovules
-reduced gametophytes
-pollen
(All of the listed responses are correct)

front 2

Which one of the following is true of seed plants, but NOT true of seedless plants?

back 2

The gametophyte is reduced and dependent on the sporophyte.

front 3

The diploid generation of the plant life cycle always _____.

back 3

produces spores

front 4

The closest seedless relatives of seed plants produce one kind of spore that gives rise to a bisexual gametophyte. What does this suggest about the ancestors of seed plants?

back 4

They were homosporous.

front 5

The eggs of seed plants are fertilized within ovules, and the ovules then develop into _____.

back 5

seeds

front 6

The cells within pollen grains are _____ and together comprise the _____.

back 6

haploid... male gametophyte

front 7

Which example below is evidence provided by living gymnosperms of an evolutionary transition between seedless and seed plants?

back 7

The sperm of some gymnosperms have flagella.

front 8

Seeds have advantages over spores. Which of the following is the best statement of this?

back 8

Seeds contain embryonic plants, an abundant food supply, and a protective covering.

front 9

Which gymnosperm phylum below is characterized by large cones and fern-like leaves and thrived during the Mesozoic?

back 9

Cycadophyta

front 10

Dietary supplements and decongestants containing ephedrine have recently become more strongly regulated in the United States. Ephedrine is an extract of a plant belonging to which phylum?

back 10

phylum Gnetophyta

front 11

What significant change occurred on Earth between the Carboniferous period and the Permian period that most likely contributed to the success of the gymnosperms?

back 11

The climate became drier and warmer.

front 12

What is located in the scalelike structures packed densely in pollen cones?

back 12

sporangia

front 13

Each pollen grain of a gymnosperm contains a _____.

back 13

male gametophyte

front 14

In ovulate cones, megasporocytes undergo _____ and produce _____ megaspores.

back 14

meiossis... haploid

front 15

In a typical conifer, how long does it take for fertilization to occur after pollination?

back 15

It takes one year.

front 16

Which types of angiosperms would most likely be wind-pollinated rather than animal-pollinated?

back 16

-maize and wheat
-roses and tiger lilies
(The first and second responses are correct)

front 17

Like gymnosperms, many grasses and angiosperm trees are wind-pollinated. To conserve energy, these angiosperms do not produce complete flowers (complete flowers have all four of the basic parts). Which part would be unnecessary for wind-pollinated angiosperms?

back 17

petals

front 18

The portion of a flower that receives the pollen is the _____.

back 18

stigma

front 19

During pollination, pollen grains are transferred from the _____ to the _____.

back 19

anther... stigma

front 20

A pea pod is formed from _____. A pea inside the pod is formed from _____.

back 20

an ovary... and ovule

front 21

After fertilization, the _____ develops into a seed and the _____ develops into a fruit.

back 21

ovule... ovary

front 22

Which of the following best describes the function of fruits?

back 22

protection and dispersal of seeds

front 23

A plant is said to be cross-pollinated if _____.

back 23

pollen grains are transferred from a different flower on the same plant

front 24

The pollen tube releases two sperm cells into the embryo sac. The result of this is the _____.

back 24

union of one sperm nucleus with the egg nucleus and of the other sperm nucleus with two nuclei of the central cell, forming a triploid nucleus called the endosperm

front 25

Of the following, which is a difference in how reproduction occurs in gymnosperms compared to angiosperms?

back 25

Only the sperm of angiosperms combine with two central cell nuclei to form triploid endosperm.

front 26

The triploid nucleus of the embryo sac develops into the _____.

back 26

endosperm

front 27

In gymnosperms, the seed coat develops from the integument. In angiosperms, the seed coat develops from the _____.

back 27

integuments

front 28

The vast majority of angiosperms with two cotyledons formerly classified as _____ are now classified as _____.

back 28

dicots... eudicots

front 29

Which of the following characterizes eudicots?

back 29

two cotyledons, netlike veins, taproot usually present

front 30

A bright pink flower with deep floral tubes will most likely be pollinated by which mechanism?

back 30

birds with long beaks

front 31

Six major crops-wheat, rice, maize, potatoes, cassava, and sweet potatoes-constitute what percentage of all the calories consumed by humans?

back 31

80%

front 32

At current rates of deforestation, tropical rain forests will be eliminated in _____ years.

back 32

200

front 33

Besides the plant tissue that humans ingest, which angiosperm tissue is most directly important for human survival?

back 33

xylem