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Angiosperm exam 2
Reproductive parts (flowers, fruits and seeds) of angiosperms
167
Biology
Undergraduate 3
03/25/2010

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Term
flower
Definition
the reproductive structures of angiosperms;is a highly modified shoot bearing specialized appendages (modified leaves)
Term
receptacle
Definition

-the modified shoot (or floral axis)

-shows the flower parts

Term
pedicel
Definition
floral stalk
Term
bract
Definition
modified leaves where flowers are sometimes born in the axil
Term
bracteoles
Definition
small, leaflike structures, located along the pedicel
Term
perianth
Definition
outer protective and/or attractive atructures;consists of sepals and petals
Term
androecium
Definition
male structures;produce and present pollen
Term
gynoecium
Definition

-female structures; produce and protect ovules

-the site of pollination and fertilization

-all the carpels of the flower

Term
complete flowers
Definition
flowers that possess a perianth, androecium and gynoecium; ex. is a lily
Term
incomplete flowers
Definition
flowers that lack one or more of the three parts (perianth, androecium, gynoceium); ex: poinsetta
Term
perfect flowers
Definition
flowers possess both an androecium and a gynoecium (bisexual)
Term
imperfect flowers
Definition
flowers that are lacking either an androecium or a gynoecium (unisexual)
Term
staminate
Definition
flowers that only possess an androecium
Term
carpellate
Definition
flowers that only possess a gynoecium
Term
monoecious species
Definition
species where both staminate (possess an androecium) and carpellate (possess a gynoecium) flowers are on the same individual
Term
dioecious species
Definition
species where the staminate and carpellate flowers are on separate individual plants (ex marijuana)
Term
tepals
Definition

-structure that makes up the perianth, when the perianth part are undifferentiated

Term
sepals
Definition
occurs when the perianth is differentiated; outer whorl; protect the inner flower parts in the bud; often green
Term
calyx
Definition
collective term for all sepals of a flower
Term
petals
Definition
occurs when the perianth is differentiated; inner whorl; usually colorful and attractive
Term
corolla
Definition
collective term for all petals of a flower
Term
stamen
Definition
pollen-bearing part of a flower; composed of a filament and anther; some are petal-like
Term
anther
Definition
part of stamen; usually has 4 pollen sacs (microsporangia)
Term
pollen sacs
Definition
where meiosis occurs which leads to the production of pollen grains (microgametophytes)
Term
connective
Definition
structure that joins the pollen sacs together and joins the pollen sacs to the filament
Term
filament
Definition
part of stamen; presents the anther
Term
carpels
Definition

-an ovule-bearing unit(s) that make up the gynoecium

Term
stigma
Definition
part of carpel; collects pollen; germination of pollen grains occur here
Term
style
Definition
connects stigma to ovaries; specialized for pollen tube growth; part of carpel
Term
ovary
Definition
part of carpel; surrounds and protects the ovules (female gametophytes); develops into fruits
Term
ovule
Definition
contains the megagametophyte, which produces an egg and is surrounded by integuments; develops into seeds
Term
funiculus
Definition
a stalk that connects the ovule to the ovary wall
Term
nectaries
Definition

-nectar producing glands often found near the base of the androecium and gynoecium

-often form projections, lobes, or disklike strucutures

-also produced in nectar spurs formed by floral parts (petals)

Term
corona
Definition
an extra ornamentation found in some flowers; often attractive; can be outgrowths of perianth parts, stames, or receptacle; diverse in form and function
Term
radial symmetry
Definition
a flower can be divided in two or more planes to produce symmetrical halves; also called actinomorphic or regular; usually round flowers
Term
bilateral symmetry
Definition
a flower that can be only divided along a single plane in order to produce symmetrical halves; also called zygomorphic or irregular
Term
asymmetrical flowers
Definition
flowers with no planes of symmetry; not common in flowers
Term
connate
Definition
fusion of like parts; petal fused to petal; carpel fused to carpel
Term
distinct
Definition

-liked parts aren't fused

-opposite of connation

Term
adnate
Definition
fusion of unlike parts; petals and sepals fuse; stamens fused to petals
Term
free
Definition
unlike parts are not fused together; lilies
Term
insertion
Definition
attachment of floral parts to receptacle (floral axis)
Term
hypogynous
Definition
flowers where the perianth and androecium are inserted below the gynoecium; has a superior ovary
Term
perigynous
Definition

-flowers where a cuplike or tubular structure surrounds the gynoecium, but without being adnate (fused together) to it

-perianth and androecium are attached to the the rim of the hypanthium (floral cup)

-has a superior ovary

Term
hypanthium
Definition
floral cups; another layer of protection around the ovary
Term
epigynous
Definition
flowers where the perianth and androecium appear to be attached to the upper part of the ovary due to fusion of the hypanthium to the ovary wall; has an inferior ovary
Term
locules
Definition
a chamber within an ovary; equals the same amount of carpels
Term
septum
Definition
wall(s)separating different locules
Term
placenta
Definition
the part of the ovary to which ovules are attached
Term
floral formula
Definition
a fast way to convey information about a species flower
Term
zygote
Definition
embryo within a seed within an ovule/fruit
Term
micropyle
Definition
passage through the integument of an ovule through which the pollen grain or pollen tube enters
Term
double fertilization
Definition
in angiosperms, fusion of one sperm with the egg to form the zygote, and fusion of the second sperm with the polar nuclei to form the nutritive tissue, endosperm
Term
endosperm
Definition
triploid (3n) nutritive tissue in the seed of most angiosperms
Term
cotyledon
Definition
a leaf or leaves developed at the first node of the embryo
Term
radicle
Definition
embryonic root
Term
pollination
Definition
act of moving pollen from the anthers and putting it on the stigma
Term
pollination syndromes
Definition
floral characteristics associated with pollination by various biotic or abiotic means (bird-pollination, bee-pollination, wind-pollination)
Term
Apomixis
Definition
"seeds without sex"; type of asexual reproduction; embryo develops from from diploid cell in ovule;clone of mother plant
Term
Pollen can come from
Definition
same flower;
different flower on the same plant;
different plant;
mixed mating systems
Term
Gametophytic
Definition

- a genetic incompatibility system

-pollen doesn't germinate (seed doesn't grow)

-depends on single allele of haploid pollen

Term
Sporophytic
Definition
pollen tube doesn't elongate after germination; depends on two alleles of father plant
Term
autogamy
Definition

-a type of pollination

-"sex with self" 

-pollen transfer within a flower

-no need for a pollen vector

-automatic self-pollination

-smart way to reproduce because it doesn't require a lot of energy

Term
Autogamy (autogamous) flowers
Definition

Floral characteristics of this type of pollination:

– Small, inconspicuous(not noticeable) flowers

– Petals don’t open ... no need to

– Bisexual flowers

– Stamens and stigma in close proximity

– Stamens and stigma mature at same time

-CAN'T occur in monoecious species

Term
Geitonogamy
Definition
“Sex with a neighbor”
-Pollen transfer between flowers of same plant(Another form of selfing)
-Genetically identical to autogamy, but different ecological implications
Term
Geitonogamy (geitonogamous) flowers
Definition

Floral characteristics for "sex w/ a neighbor" pollination

– Colorful, showy flowers (for animal pollination)

– Flowers open for wind or pollinator access

– Stamens and stigma can be spatially separated

– Stamens and stigma can mature at different times

Term
Xenogamy
Definition
“Sex with a stranger”; Pollen transfer between flowers of different plants; outcrossing; Allows greater genetic diversity of offspring which reduces inbreeding deperession; Requires a pollen vector
Term
Xenogamy flowers
Definition

Floral characteristics for this type of pollination:

 

– Colorful, showy flowers (for animal pollination)

– Flowers open for wind or pollinator access

– Stamens and stigma can be spatially separated

– Stamens and stigma can mature at different times

Term
Wind pollination
Definition

-Evolved early in land plants (gymnosperms)

-ancesteral characteristic

-Most common in temperate trees

-type of pollination

 

Term
Wind pollinated plants
Definition
– Plants often dioecious ... or stamens and stigma
mature at different times
– Flowering occurs before leaves develop
– Petals/sepals reduced or absent
– Stamens pendant (hanging) with long filaments
– Feathery stigmas with large surface area
– Lots of pollen (high pollen/ovule ratio)
– Flowers often in catkins (long, pendant inflorescences)
– Pollen often smooth, light, and small or larger with air spaces
– ± One seed per flower
Term
Water pollination
Definition
rare form of pollination; primarly marine or brackish
Term
animal pollination
Definition
-pollination that is characteristic of angiosperms, but evolved early in the evolution of land plants (gymnosperms)
-Found in most flowering plant families
-Evidence of coevolution between angiosperms and pollinators
Term
Hummingbird
Definition

-an animal pollinator

Attracted to: 

-Red flowers

-Tubular flowers can be penetrated by long beak

-Odorless (they have poor sense of smell)

-Large amounts of nectar (they are endothermic and have high energy needs)

-No landing platform (they can hover)

Term
Bats
Definition

-a type of animal pollinator

Attracted to:

-Large flowers, open at night

-musky scent

-dull color

-They visit primarily for nectar (ex bananas, mangoes)

-are rare in temperate regions

Term
Beetle
Definition

-an animal pollinator

Floral characteristics of pollinated plants:

-Flowers dull in color 

-Fruity fragrance 

-Flowers “tough” 

-Superior ovary 

-Many carpels and stamens (they eat them)

Term
Moth
Definition

-a type of animal pollinator

Characterisitics of pollinated flowers:

-Crepuscular (evening) or nocturnal opening of flowers

- Flowers white or pale in color 

-Heavy, sweet fragrance (at night)

-Very long corolla tube (to match their long mouthparts) 

-May not have “landing platform” as some of them can hover in flight

Term
butterfly
Definition

-an animal pollinator

Floral characteristics of pollinated plants:

-bright colors; often red

-flower during the day

-landing platform or dense inflorescence that serves as a platform

-could have long corolla tubes (pollinators have long mouthparts)

-nectar reward

Term
Syrphids (flower flies) and bombyliids
Definition
Not a highly specialized “syndrome” but
these flies tend to visit small, easily
accessible flowers in dense inflorescences
Term
Blow flies, carrion flies
Definition
• Dull brownish, purplish or greenish color
• Scent of rotting meat or dung
• Usually no reward ... fly is tricked into visiting flower and pollinating
Term
Bees
Definition

-an animal pollinator

-Two main “flavors”, long-tongued (LT) and shorttongued (ST)

Pollinated Floral characteristics:

-Flowers are blue, violet or yellow (less commonly, red)

-Petals often with UV reflectance as nectar guides

-Landing platforms 

-Bilateral symmetry (may be LT trait)

-also visit many generalized flowers visited by other insects

Term
*
Definition
first symbol in a floral formula
indicated radial symmetry
Term
X
Definition
first symbol in floral formula
indicates bilateral symmetry
Term
$
Definition
first symbol in floral formulas
indicates asymmetry
Term
number of sepals
Definition
second item in the floral formula
Term
number of petals
Definition
the third item in the floral formula;
Term
androecial item
Definition
the fourth item in the floral formula
is the number of stamens
Term
number of carpels
Definition
the last item in the floral formula
Term
line with the carpel number
Definition
a line that indicates the position of the inferior ovary = line drawn above carpel #
superior ovary = line drawn below carpel #
Term
connation
Definition
with the floral formula, this is indicated by a circle around the number representing the parts involved
Term
plus symbol (+)
Definition
in the floral formula this is used to indicate differentiation among the member of any floral part
Term
adnation
Definition
in the floral formula this is indicated by a line connecting the numbers representing different floral parts
Term
presence of a hypanthium
Definition
in the floral formula this is indicated by a line connecting the numbers representing the different floral parts
Term
sterile stamens/sterile carpels
Definition
in the floral formula this is indicated by placing a dot next to the number of these sterile structures.
Term
dash (-)
Definition
in the floral formula this is used to indicate variation in the number of floral parts within a taxon
used to separate the minimum and maximum numbers
Term
dashed line
Definition
in the floral formula, variation within a taxon in either connation or adnation
Term
zero (0)
Definition
indicates the lack of a particular floral part in the floral formula
Term
hypen (-)
Definition
placed before and after the item to indicate that the calyx and corolla categories have been combined
Term
fruit type
Definition
item that is listed at the end of the floral formula
Term
pistil
Definition
a term sometimes used for the structures in the center of the flower that contains the ovules
-this term is equivalent in meaning to the term carpel if the carpels are distinct
Term
nectar guides
Definition
in the corolla's of many bee pollinated flowers
-lines or marks that direct bees to the nectar source
Term
landing platform
Definition
formed by the corolla
directs pollinators toward the nectar and/or pollen and forces them to perform the movements required for pollination
Term
Inflorescence
Definition
-Arrangements of flowers on a plant
– Form of shoot and arrangement of flowers
– Taxonomically informative
Term

Determinate (monotelic) inflorescence

 

[image]

Definition

-a type of inflorescence

– Main axis of the inflorescence ends in a flower

– Top (or central) flower usually opens first

– Usually ancestral (evolved from) indeterminate

Term
Indeterminate (polytelic)inflorescence
Definition

- a type of inflorescence

– The growing point of the inflorescence only produces lateral (the side) flowers or partial inflorescences (groups of flowers).

– Bottom (or outer) flowers usually open first

Term

cyme

 

[image]

Definition

-type of determinate inflorescence

-lateral branches of the inflorescence are composed of 3-flowered units that are showing opposite branching

Term

[image]

 

panicle

Definition
-type of determediate inflorescence -like cyme – a cyme where the branches first produce several internodes before ending in a terminal flower
Term
[image]Helicoid (Scorpioid) cyme
Definition
-type of cymes -forms a coil due to the abortion of one flower wthin each of the three-flowered units
Term
Heads (capitulums)
Definition
type of inflorescence is a dense terminal cluster of sessile (no stalk) flowers in indeterminate-> peripheral flowers open first in determinate-> center flowers open first
Term
umbel
[image]
Definition

-a type of determinate or indeterminate inflorescence

-all the flowers often have pedicels of approximately equal length that arise from a common point at the apex of
the inflorescence

 

Term
compound umbels
Definition
umbels that are usually umbels of umbels, but maybe racemes of umbels
Term
Catkins (aments)
Definition

-a kind of inflorescence

-consists of a dense. elongated, mass of inconspicuous, usually wind-pollinated flowers

-can be determinate or indeterminate

Term

Raceme

[image]

Definition

-type of indeterminate inflorescence

-a single axis with pedicellate flowers

Term

Spike

[image]

Definition

-a type of simple, indeterminate inflorescence

-similar to a raceme but flowers are sessile (no pedicel)

Term

Corumb

 

Definition

-type of intermediate inflorescence

-a raceme with the pedicels of the lowermost flowers elongated, so that all flowers are at the same level

-looks like a menorah

Term
Panicle
Definition

-type of intermediate inflorescence

-a compound raceme (with branches)

 

Term
head (capitulums) and umbels
Definition

-type of interdeterminate inflorescence

- have the oldest flowers on the periphery

Term
Simple inflorescences
Definition

-type of inflorescence that has a single axis

-one order of branching

-ex:racemes, spikes, umbels, and heads

 

Term
compound inflorescence
Definition
-type of inflorescence that has multiple floral axes
-two or more orders of branching
Term
Epiphyllous
Definition
type of inflorescence or flower that is borne on leaves
Term
Cauliflorous
Definition
type of inflorescence or flower that is borne on older stems and/or trunks
Term
fruit
Definition
A mature, ripened ovary along with its
contents and any accessory structures
Term
seeds
Definition

-product of the ovule after fertilization

-contains an embryo and often its nutritive tissue (endosperm, perisperm)

-reproductive part of angiosperms

Term
Agamospermy
Definition
seeds and fruits produced without fertilization (clonal)
Term
Parthencarpic fruits
Definition
fruits that mature without seeds
Term
simple fruits
Definition

-fruit developing from a single ovary (carpel)

-ex:  tomatoes, blueberries, peaches, cherries, apples

Term
Aggregate fruits
Definition

-a division of simple fruits

- fruits that develop from several ovaries in a single flower

-ex:  raspberries, blackberries,

Term
multiple fruit
Definition
type of fruit that is from several ovaries from multiple flowers
Term
dehiscence
Definition
a method or process of opening of a structure, like a fruit
Term
multiple fruit
Definition
type of fruit that is from several ovaries from multiple flowers
Term
dehiscent
Definition
fruit with a dry/fibrous to leathery or fleshy outer husk that early to taridly breaks apart exposing one or more nutlike pits exposing seeds
Term
indehiscent
Definition

-doesn't open up by itself

-many fleshy fruits have this characteristic

Term
pericarp
Definition
fruit wall
can be fleshy, dry or hard
Term
endocarp
Definition
The hard inner layer of the pericarp of many fruits, such as the pit or stone of a cherry, peach, or olive
Term
mesocarp
Definition
The middle, usually fleshy layer of a fruit wall.
Term
exocarp
Definition
The outermost layer of the fruit wall
Term
inferior ovaries in fruits
Definition

-type of ovary in a fruit

-the other floral parts fuse with the pericarp

Term
Achene
Definition

a pretty small, indehiscent, dry fruit with an thin and close-fitting wall surrounding a single seed

ex:sunflower seed

Term
Grain (caryopsis)
Definition

-small, indehiscent, one seeded dry fruit,

-pericarp fused to ovary wall

-ex:corn

Term

Nuts

[image]

Definition

-pretty large indehiscent dry fruit

-1 seeded with hard or bony pericarp wholly or partially surrounded by a husk of bracts

-ex:acorn

 

Term

Follicle

[image]

Definition

-a dehiscent fruit

-pods split along ventral side

Term

Legume

 

[image]

Definition

-a dry, dehiscent fruit

-pods split along 2 opposite edges

-ex: peanut

Term

Silique

[image]

Definition

-type of dehiscent, dry fruit

-similar to a legume

-a peice of tissue is left in the center

-pericarp splits along the junction of 2 carpels

Term

Capsule

 

[image]

Definition

-a dry, rarely fleshy dehiscent fruit

-the pericarp opens with pores or slits

-ex: opium poppy

Term

Schizocarp

[image]

Definition

-a dehiscent, dry fruit

-fruit splits into ≥2 achenelike segments with free seeds inside

-ex: helicopter seeds

Term
Berry
Definition

-an indehiscent, fleshy fruit

-has one to many seeds

-mesocarp fleshy,
-endocarp soft

-most fleshy frits are some variation of this kind

Term

Drupe

[image]

 

Definition

-an indehiscent, fleshy fruit

-has 1 or 2 seeds

-fleshy mesocarp

-hard endocarp

-endocarp is clearly distinct from the mesocarp

-have pits

-ex: peaches

Term

Hesperidium

[image]

Definition

-fleshy, indehesiant fruit

-Berry with a leathery rind (peel) with oil glands and specialized hairs

-characteristic of the citrus family

Term
Pepo
Definition

-A hard-rinded berry that includes accessory tissue

-a fleshy fruit, indehesiant fruit

-has an extremely hard exocarp, often thick, like a pumpkin

Term
Pome
Definition

-an indehiscent fleshy fruit

-A berry-like fruit with most of the flesh derived from accessory tissue

ex: apple, most of the flesh is the receptacle

Term
fleshy fruits
Definition

-attract animal dispersers

-“Cheap” rewards (sugars, water, water soluble vitamins) Seeds spit out, dropped, pass unharmed

-Contain nutrients used by the seed for development  -Fats, oils, starches 

-Toxins, hard shells or seed coats to deter herbivory

Term
Bird disperal
Definition

-dispersal that involves colorful, flesh or seed coat

-red, blue, black

-Fleshy, indehiscent fruits (berries, drupes, pomes), or fruits with fleshy accessory structures associated with the fruit -

– Seeds often protected by a bony wall or toxins

– No odor

- Nuts or seeds that are buried (hidden)

Term
mammal disperal
Definition

-type of fruit and seed dispersal

• odor important, color not so much

• Fleshy with hard centers

• Leathery or hard skin that open to reveal fleshy tissue, arilate seeds, or seeds with fleshy testa

• Seeds protected with toxins or thick walls

• Often associated with stockpiling food – Hiding nuts and seeds

– Nutritious - high oil content

-fruit often dropped from the plant

Term
dispersal by the plant itself
Definition

-type of fruit and seed dispersal

• Gravity

• Explosive discharge of seeds, fruits –>bc of  Turgor pressure changes, hygroscopic tissues (ex: squirting cucumber, small movements cause them to trigger)

• Passive movements of fruits by wind, rain, animals

• Creeping movements of seeds themselves due to hygroscopic changes

peanut is a fruit that plants itself
Term
endosperm
Definition

-the nutritive tissue derived from fusion of the two polar nuclei and one sperm

-can either be homogeneous or ruminate

-may contain starch, oils, protein, oligosaccharides

-nourishes the developing embryo

Term
epigynous
Definition
[image]
Term
Indeterminate umbels
Definition

- a type of umbel

-has the have the oldest flowers on the bottom

Term
determinate umbel
Definition

-a type of umbel

-has the oldest flowers on the top/center

Term

navel orange

[image]

Definition

-a type of parthencarpic fruit

-is produced due to a mutation in genome, so seeds don't develop properly or don't develop at all.

Term
Triploids (watermelons)
Definition

- a type of parthencarpic fruit

-meiosis doesn't occur properly, but you still get some fertilization (white seeds)

Term
homogeneous
Definition
endosperm that is uniform in texture
Term
ruminate
Definition
endosperm that is dissected by partitions that grow inward from the seed coat
Term
seed coat
Definition
-surrounds the seed
-develops from the integuments
Term
testa
Definition
- region of the seed coat that develops from the outer integument. Variable in texture and color
Term
tegmen
Definition
- region of the seed coat that develops from the inner integument
Term
Aril
Definition
- hard or soft, oily or fleshy,
often brightly colored outgrowth of the seed
– Usually derived from the funiculous or
sometimes the outer integument
Term
wind dispersal
Definition
• Tufts of hairs on seed or fruit
• Wings on seed or fruit
• Dust-like seeds
• Balloon-like testa or other inflated structures
Term
water dispersal
Definition
type of dispersal
• Fruits or seeds washed away by
rainfall
• Carried in water currents
• Small, dry, hard seeds/fruits
• May have spines or projections that
help them anchor to a substrate
• Slime
• Unwettable surface
• Low density (floating)
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