Ch 38

Question 1

Angiosperms can reproduce

Answer 1

sexually and asexually

Question 2

Plant life cycles are characterized by the

Answer 2

alternation between sporophyte (spore-producing) and gametophyte (gamete-producing) generations

Question 3

In angiosperms the plant that we see is the

Answer 3

sporophyte

Question 4

The angisperm life cycle is characterized by

Answer 4

Flowers, double fertilization, and fruits

Question 5

Flowers consist of 4 floral organs

Answer 5

carpels, stamens, petals, and sepals

Question 6

Flowers are

Answer 6

the reproductive shoot of the angiosperm sporophyte

Question 7

Receptacle

Answer 7

Where the flower and stem attach

Question 8

Flower reproductive organs

Answer 8

Stamens and carpels

Question 9

Flower sterile organs

Answer 9

Sepals and petals

Question 10

Style

Answer 10

a long, slender stalk that connects the stigma and the ovary

Question 11

Stigma

Answer 11

Sits at the top of the style and is a sticky platform where pollen is deposited

Question 12

Carpel

Answer 12

The female reproductive structure made up of the stigma, style, and ovary

Question 13

Pistil

Answer 13

A single carpel or group of fused carpels

Question 14

Stamen

Answer 14

Male reproductive part, consists of a filament topped by an anther with pollen sacs that produce pollen

Question 15

Anther

Answer 15

Oval shaped structure that produces the male gametophyte pollen

Question 16

Complete flowers

Answer 16

Contain all 4 floral organs

Question 17

Incomplete flowers

Answer 17

Lack 1 more floral organs

Question 18

Inflorescences

Answer 18

Clusters of flowers

Question 19

Angiosperm life cycle

Answer 19

Gametophyte development
Pollination
Double fertilization
Seed development

Question 20

Embryo sac

Answer 20

Female gametophyte, develops within the ovule

Question 21

Ovule Structure

Answer 21

2 integuments surrounded by a megasporangium

Question 22

Megaspore development

Answer 22

One cell in the megasporangium undergoes meiosis producing 4 megaspores only 1 of which survives

Question 23

The megaspore divides without

Answer 23

cytokinesis, producing 1 large cell with 8 nuclei which is made into the embryo sac

Question 24

Pollen develops from

Answer 24

microspores within the microsporangia, or pollen sacs of anthers

Question 25

Each microspore undergoes

Answer 25

mitosis to produce 2 cells: the generative and tube cell

Question 26

Pollen grain

Answer 26

Consists of 2-celled male gametophyte and the spore wall

Question 27

Pollination

Answer 27

The transfer of pollen from an anther to a stigma

Question 28

After landing on a receptive stigma a pollen grain produces

Answer 28

a pollen tube that grows down into the ovary and discharges 2 sperm cells near the embryo sac

Question 29

Fertilization

Answer 29

The fusion of gametes, occurs after 2 sperm reach the female gametophyte

Question 30

One sperm fertilizes the egg and the other

Answer 30

combines with the two polar nuclei giving rise to the triploid food-storing endosperm (3n)

Question 31

Double fertilization ensures that

Answer 31

endosperm only develops in ovules containing fertilized eggs

Question 32

Double fertilization

Answer 32

The joining of a female gametophyte with two male gametes (sperm)

Question 33

After double fertilization each ovule develops into

Answer 33

a seed

Question 34

The ovary develops into a

Answer 34

fruit enclosing the seed

Question 35

When a seed germinates, the embryo develops into

Answer 35

a new sporophyte

Question 36

The transfer of pollen from anthers to stigma can be accomplished by

Answer 36

wind, water, or animals