BIOL10005 Lecture Notes - Lecture 21: Endosperm, Meiosis, Double Fertilization

63 views3 pages

jadebutterfly872

29 Jun 2018

School

University of Melbourne

Department

Biology

Course

BIOL10005

Professor

All

For unlimited access to Class Notes, a Class+ subscription is required.

Lecture 21: Seed plants and flowering plants

Ferns:

Roots and vascular tissue for water uptake + transport

oCan grow much larger than mosses

oBody differentiate into rooms, stems, leaves

Sporophyte dominates

Motile gametes (sexual reproduction reliant on free water)

oHave to swim & find free water to get to egg cells

Same life cycle with the mosses

Seed Plants

Cycads, Conifers, Angiosperms (flowering plants)

Seed – embryonic plant encased within a protective coating typically resources with stored

food

Seed plants have four main derived features: major events in land plant evolution

oDevelopment of secondary growth

produces woody tissue, adds to girth

oProduce two types of spores (Heterospory):

megaspores (in ovules – female)

microspores (pollen – male)

in conifers both are born on cones

oReproduce by seeds – female gametophyte and embryo enclosed within an ovule,

which is nourished and protected on the parent plant

oMale gametes transported in pollen

Secondary growth

 The vascular cambium is the meristem that produces additional (secondary) vascular tissue

(xylem and phloem)

 Secondary growth increases the girth of a stem by adding wood and bark

 Secondary growth is essential for development of shrubs and trees

Pollination: liberate land plants from the need of free water for fertilisation

SEEDS:

Developed from fertilized ovules

Ovule is a sporangium (or container) surrounded by a protective covering (integument)

Ovule contains only 1 functional spore --> retained on the parent plant

Pollen

Pollen grains are transported to the ovule (female gamete) prior to sperm cell development

Pollen are wind-blown to the female ovule

The sperm cells do not require free water

Pollination and fertilization are widely separated...

Conifers

 c.600 species of shrubs and trees

 Tallest and longest-lived organisms

 Ecological and biogeographic important

 Economic value – softwood, timber, paper

find more resources at oneclass.com

Unlock document

This preview shows page 1 of the document.
Unlock all 3 pages and 3 million more documents.

Already have an account? Log in

Document Summary

Roots and vascular tissue for water uptake + transport o o. Motile gametes (sexual reproduction reliant on free water: have to swim & find free water to get to egg cells. Seed embryonic plant encased within a protective coating typically resources with stored food. Seed plants have four main derived features: major events in land plant evolution: development of secondary growth produces woody tissue, adds to girth. The vascular cambium is the meristem that produces additional (secondary) vascular tissue (xylem and phloem) Secondary growth increases the girth of a stem by adding wood and bark. Secondary growth is essential for development of shrubs and trees. Pollination: liberate land plants from the need of free water for fertilisation. Ovule is a sporangium (or container) surrounded by a protective covering (integument) Ovule contains only 1 functional spore --> retained on the parent plant. Pollen grains are transported to the ovule (female gamete) prior to sperm cell development.

Related Questions

Question 1

The key innovation that allowed for plant survival on land, seenin the first land plants and all others after, but not in thecharophytes, is

Question 1 options:

	fruit.
	vascular tissue.
	the seed.
	protection of the embryo.

Question 2

Which dramatic change in the alternation-of-generations lifecycle led to the protection of all phases of the life cycle and theformation of seeds?

Question 2 options:

	transition from a dominant gametophyte generation to a dominantsporophyte generation
	transition from a dominant sporophyte generation to a dominantgametophyte generation

Question 3

Which structure(s) allow the sporophyte of vascular plants to beprotected against drying out?

Question 3 options:

	the waxy covering of leaves, called the cuticle
	small openings in the leaves, called stomata
	guard cells that surround each stoma
	all of these structures protect the dominant sporophyte fromdrying out

Question 4

Why are the bryophytes called nonvascular plants?

Question 4 options:

	because they are specialized for transporting water and organicnutrients
	because their roots, stems, and leaves lack vascular tissue
	because they protect their embryo
	because they produce wind-blown spores

Question 5

Which generation is dominant in the bryophytes?

Question 5 options:

	the generations are equally dominant
	the sporophyte
	the gametophyte
	there is no sporophyte generation in bryophytes

Question 6

Which of the bryophytes are typically low-lying, due mostly totheir need for moisture and lack of vascular tissue?

Question 6 options:

	the mosses
	the liverworts
	the hornworts
	all of the bryophytes are low-lying

Question 7

Which structure of the moss protects the embryo from dryingout?

Question 7 options:

	the archegonium
	the antheridium
	the sporangium
	the stalk

Question 8

Cooksonia were the first __________ plants; they hadwind-blown spores, __________, leaves, and roots.

Question 8 options:

	nonvascular; branches
	vascular; seeds
	nonvascular; seeds
	vascular; branches

Question 9

The roots of today's lycophytes are much like __________ were inearly vascular plants; the vascular tissue is __________.

Question 9 options:

	roots; centrally placed
	stems; centrally placed
	leaves; only found at the perimeter
	branches; only found at the perimeter

Question 10

Pteridophytes, or ferns and their allies, are __________vascular plants with __________.

Question 10 options:

	seed-producing; microphylls
	seedless; microphylls
	seedless; megaphylls
	seed-producing; megaphylls

Question 11

Microphylls __________. Megaphylls__________.

Question 11 options:

	are found in all vascular plants; are only found in thelycophytes
	are broad leaves with a single strand of vascular tissue; arenarrow and have several strands vascular tissue
	are broad leaves with several strands of vascular tissue; arenarrow and have a single strand of vascular tissue
	are narrow and have a single strand of vascular tissue; arebroad leaves with several strands of vascular tissue

Question 12

The fern life cycle

Question 12 options:

	all of these choices accurately describe the fern lifecycle.
	is dependent on external water.
	relies on the wind to disperse the spores.
	produces a gametophyte that lacks vascular tissue.

Question 13

Seed plants use meiosis to produce

Question 13 options:

	spores and pollen.
	seeds and fruit.
	pollen and seeds.
	microspores and megaspores.

Question 14

In seed plants, a microspore develops into

Question 14 options:

	an egg.
	a pollen grain.
	a sporophyte.
	All of these answers correctly complete this sentence.

Question 15

Within the angiosperms, or ___________, two groups exist. Theyare named for their __________.

Question 15 options:

	vascular plants; number of cotyledons, or seed coats
	nonvascular plants; leaf type
	flowering plants; number of cotyledons, or seed coats
	fungi; leaf type

Question 16

The __________ parts of a flower are the stamens, each of whichhas two parts: the anther and the filament. The __________ parts ofa flower are the carpel, which has three major regions: the stigma,the style, and the __________.

Question 16 options:

	female; male; ovary
	male; female; sepals
	female; male; sepals
	male; female; ovary

Question 17

Double fertilization during the angiosperm life cycle involvestwo sperm, one of which __________, while the other __________.

Question 17 options:

	fertilizes the egg to form a zygote; produces the endospermnucleus, which will develop into food for the developing plant
	is a mature male gametophyte; is an immature malegametophyte
	lands on the carpel of the plant; is usually blown away in thewind
	develops into the seed; develops into the fruit that surroundsthe seeds

Question 18

The bodies of most fungi are made up of a network of filamentscalled hyphae.

Question 18 options:

	True
	False

Question 19

What is the difference between land fungi and the chytrids?

Question 19 options:

	Land fungi are motile and have flagella at all stages of theirlife cycle. The chytrids do not have flagella.
	Land fungi are nonmotile and do not have flagella at any stageof their life cycle. The chytrids have flagellated spores andgametes.
	Land fungi are nonmotile and only have flagellated spores. Thechytrids have flagellated spores and gametes.
	Both are motile for part of their life cycle. Land fungi aremotile as gametes. Chytrids are motile as spores.

Question 20

The vast majority of described species of fungi are __________fungi, which include unicellular __________, which reproducesexually once their food supply runs out. When yeast ferment, theyproduce ethanol and carbon dioxide.

Question 20 options:

	zygospore; black bread molds
	club; mushroom
	sac; yeast
	mutualistic; lichen

yellowmuskrat453

BIOL10005 Lecture Notes - Lecture 21: Endosperm, Meiosis, Double Fertilization

Document Summary

Get access

Related Documents

BIOL10005 Lecture Notes - Lecture 30: Cork Cambium, Vascular Cambium, Secondary Growth

BIOL10005 Lecture Notes - Lecture 23: Wollemia, Supercontinent, Vascular Cambium

BIOL10005 Lecture Notes - Lecture 21: Heterospory, Sporophyte, Secondary Growth

Related Questions