BIOL 1001 Lecture Notes - Lecture 5: Pith, Phloem, Pericycle

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16 Mar 2023

School

Louisiana State University-Alexandria

Department

Biology

Course

BIOL 1001

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Document Summary

The stele of the vascular plants comprises the pericycle (the non-vascular tissues between the phloem and cortex), the primary vascular tissues and the pith, when present. There are two basic types of the steles: Which consists of a solid central cylinder of xylem (i. e. no pith) surrounded by phloem. Three types of the protostele can be distinguished: 1-haplostele: in which the xylem appears more or less circular in cross section. In which the xylem is stellate in cross section. 3-plectostele: in which the xylem is split into longitudinal plates some of which are joined and others are separate. In which there is a cylinder of pith within the xylem. Phylogenetically, siphonostele is more advanced and it is thought that it has developed from the protostele by developing a pith inside the xylem. Two types of the siphonostele are distinguished according to the arrangement of the xylem and phloem: In which phloem surrounds the xylem both externally and internally.

Related Questions

As vascular plants evolved, they developed several important evolutionary advances. Explain the importance of each of the following:

a. vascular tissue

b. seeds

c. flowers

d. fruits

4. Explain how biologists use variations in body plans to categorize animals. Be sure to describe different types of:

a. symmetry

b. tissue organization

c. body cavities

d. modes of early development

5. List the major groups of extant (living) vertebrates, along with their distinguishing characteristics. Also, explain the evolutionary changes that resulted in groups branching off from each other (e.g. jaws, limbs, etc.).

1- Fundamentally, "Alternation of Generations" states that it is NOT possible for haploid organisms to be anything other than gametes

True , False

2- Which of the following are modern representatives of plants that first conquered land?

Bryophyta

Charophyta

Chlorophyta

Rhodophyta

3- Evolution of vascular tissues is important for land plants. This is part because...

vascular plant rhizoids are connected to vasular tissues

vascular tissues coincide with evolution of more rigid supporting compounts

vascular tissues coincide with evolution seed

vascular tissues coincide with evolution flowers

none of the above coincided with the evolution of vasculature

4- Spores are a result of mitotic division of sporocytes.

True

False

5- Mosses transport water and solutes in their vascular tissues.

True

False

6- Non-vascular plants produce lignin to support taller structures.

True

False

7- The egg of a moss is produced within a cavity called a...

sporangium

8- One of the significant adaptations to prevent drying out in the land environment was the development by vascular plants of (a)

both cuticle and stomata are correct

9- A moss protonema...

has the n number of chromosomes in each cell

is a part of the sporophyte generation

produces gametes

is saprophytic like a fungus

produces spores

10- The cohesion of water molecules and their adhesion to the walls of narrow tubes that results in water rising in the tubes is called...

raspberryprairie-dog543

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

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BIOL 1001 Lecture Notes - Lecture 5: Pith, Phloem, Pericycle

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