Ch. 38: Angiosperm Reproduction

Question 1

What flower structures are analogous to the anther and filament?

Answer 1

anther + filament = stamen

stigma + style = pistil

Question 2

Why are 2 sperm required for producing a sed with 1 embryo?

Answer 2

Double fertilization: 1st sperm clears path for 2nd sperm

1st sperm: initiate the death of one of the two synergies
-fertilizes the egg

2nd sperm: combines with the two polar nuclei forming a triploid nucleus (endosperm, 3n)
-prevents angiosperm from squandering nutrients on infertile ovules

Question 3

Is a pollen grain a gametophyte or sporophyte?

Answer 3

(male) gametophyte

Question 4

What protective role does the hypocotyl play as a seedling germinates and emerges from the soil?

Answer 4

Hypocotyl will terminate in the radical and become a plant stem

• protect the cotyledon upon germination
• will tell the cotyledon when two develop at germination
• protect the inside of the seed

Question 5

Why are fruits generally attractive to animals?

Answer 5

• colorful

- high in sugar / sweet

Question 6

Why are flowers generally attractive to flying insects?

Answer 6

• colorful

- high in sugar

Question 7

What feature of angiosperms probably explains their position as dominant land plants? Why?

Answer 7

Fruits (or flowers)

People and animals love them and are attracted to them.
- the more fruits consumed, the more their seeds are spread and fertilized

Question 8

Key features of the angiosperm life cycle

Answer 8

Flowers
Double fertilization
Fruits

Question 9

Perfect flower

Answer 9

both male and female reproductive structures

Question 10

Embryo

Answer 10

2n

sporophyte

Question 11

Embryo sac

Answer 11

female gametophyte

Question 12

Gametogenesis

Answer 12

male and female

Question 13

Double fertilization

Answer 13

3n

endosperm