Bio 108 - Lecture 12 Flashcards Preview

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Flashcards in Bio 108 - Lecture 12 Deck (29):
1

One Phylum of Angiosperms

Anthophyta

2

Phylum Anthophyta

- Majority of seed plants, 250 000 species
- Includes all sizes

3

Microsporophylls on a flower

Stamens = Anther + Filament (male)

4

Megasporophylls on a flower

Carpels = Stigma + style + ovary (female)

5

Perfect vs Imperfect Flower

Perfect: Both stamens and carpels
Imperfect: Only has either stamens or carpels

6

Anthos =

Flower

7

Monoecious
Mono =
Oikos =

- When an imperfect flower has male and female flowers on same individual plant
mono = one
Oikos = House

8

Diocecious
di =

When an imperfect flower has male and female flowers on different individual plants

9

What is a fruit?

- A mature ovary containing seeds
- The "container" part of the angiosperm
- Can be dry and thin, or thick and fleshy

10

How does fruit effect Seed dispersal?

Fruit aids dispersal of seeds, by either catching wind, or by catching animals

11

What is a Cotyledon?

- an embryonic seed leave present inside the seed
- Radicle (embryonic root) is also present in seed

12

Dicots vs Monocots

Dicots: Two cotyledons
Monocots: One cotyledon

13

What do anthers produce?

Microspores that produce male gametophytes inside pollen

14

What do Ovules Produce?

Ovules produce megaspores that produce female megagametophytes called embryo sac

15

Have many cells in a angiosperm megagametophyte?

7 cells, much smaller then gymnosperm megagametophyte

16

When does Polination occur?

When pollen lands on stigma

17

What is a polar body?

When a megagametophyte cell has two nuclei

18

What happens during germination?

1) The generative cells divides to form 2 sperm
2) The pollen tube grows down style to ovule in ovary, taking sperm with it

19

What is Double Fertilization?

1) One sperm fuses with egg and produces a 2n zygote
2) Other sperm fuses with polar bodies and becomes a triploid endosperm

20

What is the role of the Triploid Endosperm?

1) Takes nutrients from parent gametophyte
2) Undergoes mitosis to produce food for embryo

21

When did Angiosperms start appearing?

During Cretaceous and early Tertiary periods

22

How Cyads are like Angiosperms

- Larvae of weevil develops in male cones
- When adult weevils emerge and get dusted with pollen
- Adult weevils are attracted to sugary fluid produced by female cones
- Pollen fertilized the egg

23

3 Gymnosperms that reproduce like Angiosperms

1) Cyads
2) Gnetum
3) Welwitschia Mirabilis

24

Some Characteristics of Gymnosperms being related to Angiosperms

- Some gymnosperms reproduce by double fertilization.
- Each sperm gets fertilized, but as zygote grows, the, other aborts

25

3 Advantages to Angiosperm - Style Fertilization

1) Food store for seed develops only after fertilization
2) Female gametophyte reduced in size and is cheaper to produce
3) Production of female gametophyte takes only a few days rather then months

26

What is the oldest angiosperm?

Amborella Trichopoda

27

6 Main Differences between Monocots and Eudicots

1) 1 vs 2 Cotyledons
2) Parallel vs Netlike Veins
3) Scattered vs Ring-like vascular tissue
4) Fibrous root vs taproot
5) 1 vs 3 openings in pollen
6) Flower parts in 3's vs 4's or 5's

28

Eudicot

A monophyletic subset of dicots

29

4 Importances Angiosperms Have to Humans

1) Food
2) Oil
3) Spices and flavorings
4) Drugs