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BIOL 1407
Review Sheet
Plants
1) All plants have apical meristems. These are regions of cells that divide
producing longitudinal growth.
This allows the plant structures (roots, stems, leaves, etc.) to elongate
(primary growth). Increasing the
girth of a structure is called secondary growth. p576
2) All plants have multicellular, diploid embryos that are protected and
nourished within tissues produced
by the parents (e.g. the seed in gymnosperms and angiosperms, the archegonium in
mosses and ferns). For
this reason plants (in contrast to green algae, etc.) are refered to as
embryophytes. p577
3) All plants have alternation of generation. The two alternating generations
are called sporophyte (2N)
and gametophyte (1N). The more primitive condition is to have a dominant
gametophyte (this is the case
in most green algae and bryophytes). p576
4) The general life cycle is as follows (terms in italics are the process that
produces the following stage):
sporophyte  meiosis  spores  mitosis  gametophyte  mitosis  gametes 
fertilization 
zygote  mitosis  sporophyte.
5) Mitosis: 1N  1N or 2N  2N
6) Meiosis: 2N  1N
7) Fertilization: 1N  2N
8) Spores are produced by meiosis in the sporangia, organs of the sporophyte. In
mosses, the sporangia is
found in the capsule. In ferns, the sporangia are called sori and are found in
the undersides of the leaves.
In gymnosperms, the male and female cones are the sporangia. In angiosperms, the
male and female parts
of the flower are the sporangia. Spores are produced from 2N cells in the
sporangia. p577
9) Gymnosperms and angiosperms are heterosporous. This means that there are
distinct male and female
spores that are produced by separate male and female sporangia. The spore that
generates the female
gametophyte is called the megaspore. The spore that generates the male
gametophyte is called the
microspore. p592
10) Seedless plants are homosporous. All of their spores are produced from a
single type of sporangium.
p586
11) Gametes are produced by mitosis from gametangia, organs of the gametophyte.
All plants have an egg
producing gametangia called an archegonium (female) and a sperm producing
gametangia called an
antheridium (male). p577
12) General differences in major plant groups (general overview of ch 29 and
30):
Group
Bryophytes
(mosses,
liverworts, etc.)
Pteridophytes
(seedless
vascular plants)
(e.g. Ferns)
Gymnosperms
Angiosperms
Gametophyte
dominant?
Yes
Vascular
tissue?
Usually
no
Seeds?
Pollination
No
Flowers and
Fruits?
No
No
Yes
No
No
No pollen
(homosporous)
No
No
Yes
Yes
Yes
Yes
No
Yes
Wind only
Animals or wind
No pollen
(homosporous)
13) In seedless plants (bryophytes and ferns) sperm are released from the
antheridium and swim through
environmental water to the archegonium. p580-1, 584-5 In seed plants, sperm are
carried to the female
reproductive organ (cone or pistil) by pollen (the male gametophyte). The pollen
grain grows a pollen
tube to the archegonium, and the sperm swims through the tube to the egg. p5927, p599-600
14) Review the moss life cycle from figure 29.8.
15) Review the fern life cycle from fig 29.12. Note in particular the
similarities and the differences with
the moss life cycle. What is a prothallus?
16) Review the life cycles of the seed plants: gymnosperm and angiosperm in fig.
30.6 and 30.10. One of
the main differences bewtween seedless plants and seed plants is that seeds
plant spores are not dispersed
before developing into gametophytes, but instead develop into gametophytes
within the sporangia.
17) To avoid offspring growing on top of parents, dispersal is necessary at some
point in the plant life
cycle. Seedless plants (mosses and ferns) disperse spores. p580-1, p585-6 Seed
plants disperse seeds.
p593-600
18) The two largest groups of angiosperms are dicots (sometimes called eudicots)
and monocots.
Monocots include grasses, grains like corn and wheat, lilies, irises, bamboo,
palm trees, and orchids. Most
other angiosperms are dicots. p602-3
# of cotyledons Leaf veins
Stem vascular
Usual # of
Roots
bundles
flower parts
Monocots
1
Parallel
Complex
Multiple of 3
Fibrous
arrangement
Dicots
2
Branched
Arranged in a
Multiple of 4
Taproot
ring
or 5
19) Plants have two main body parts: shoot system and root system. Shoots are
stems, leaves and flowers.
Roots are usually underground, and function to absorb water and inorganic
nutrient. Roots also may
function in storage. p713-4
20) Plants have three tissue systems: epidermal tissue (covers and protects all
plant parts except woody
stems); vascular tissue (xylem and phloem; transport water, sugar, nutrients,
and provide support); and
ground tissue (fills in the spaces between vascular and epidermal tissue;
support; storage; photosynthesis).
p717
21) Plant epidermal tissues secrete a waxy cuticle to seal their aboveground
parts against drying. Vascular
plants have stomata on their leaf surfaces which may open or close to control
the evaporation of water out
of the leaf. Stomata are lined by two guard cells. When the guard cells are
swelled with water they buckle
apart and the stomata opens. When the guard cells have low water pressure, the
guard cells seal together.
p724-5
22) Phloem transports sugar made by photosynthesis as sugary sap. Xylem
transports water and minerals.
Mature xylem is made of dead cells that form long tubes made of cell walls.
p717,719 Water is
transported to high parts of the plant via evaporative transpiration. Xylem
tubes extend from the roots all
the way up until they open near the stomata. When water evaporates from the
stomata, a vacuum is
created. This vacuum draws water up from the xylem, creating a negative pressure
that draws moisture
from the soil into the roots. p746-50
23) Know how a woody stem develops from a herbaceous stem. See fig 35.18, 35.19,
35.20. Know how
vascular cambium produces both xylem and phloem. What happens to a year’s
secondary growth of
xylem when a new growth of secondary xylem is produced? What happens to the old
secondary phloem
when new phloem is produced? What is the difference between heartwood and
sapwood? What happens
to epidermal and ground tissue (e.g. the pith) when a herbaceous stem develops
into a woody stem? p725-8
24) A unique and very important adaptation in angiosperms is animal pollination.
Some angiosperms are
pollinated by wind, like gymnosperms. But most angiosperm pollen is carried to a
female stigma by a
particular kind of animal. p604
25) Some plants (e.g. legumes like clover or soybean) form mutualistic,
symbiotic relationships with
cyanobacteria living in root nodules. What nutrient does cyanobacteria make
available for the plant?
p764-6
26) Plants produce compounds other than carbohydrates, fats, or proteins called
secondary compounds.
Many of these are of practical use. See table 30.1. p605
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