Exam 2 Flashcards
Interveinal chlorosis appearing in young leaves indicates a deficiency in:
Iron or manganese
General chlorosis indicates a deficiency of
nitrogen or sulfur
Stunted plants with anthocyanin accumulation in older leaves indicates a deficiency in
phosphorus
A plant response to a directional signal such as gravity, light or touch that results in oriented
growth is called
tropism
Phytochrome is a plant red light receptor that is photoconvertible between two forms Pr and
Pfr. Phytochrome is a
protein
You are a scientist working on conditions that promote seed germination. You found that red
light promotes germination and you wonder whether phytochrome is involved. To test this
hypothesis you treat the seeds with red light followed by
far red light
. Phytochrome is used by plants to sense if they are being shaded by other plants. The R/FR ratio
is detected by phytochrome. The R/FR ratio decreases in the shade but why?
because leaves absorb red light
Two blue light photoreceptors in plants are:
phototropin and cryptochrome
The hormone that causes leaf abscission is:
ethylene
When an oat coleoptile is exposed to blue light from one side, the hormone ________________
accumulates on the opposite side of the coleoptile and promotes cell elongation. That makes the
coleoptile grow towards the light.
auxin
The hormone that controls plant response to gravity (gravitropism) is called
auxin
Inhibition of lateral buds by the shoot apical meristem is called apical dominance. The
hormone that is responsible for apical dominance is:
auxin
A hormone that promotes seed germination is
gibberellin
Ripening in climacteric fruit is associated with production of this hormone:
ethylene
A hormone that inhibits seed germination is:
abscisic acid
Which hormone causes the triple response?
ethylene
The hormone that is produced during drought stress and causes stomatal closing is:
abscisic acid
The part of the gene that mainly controls gene expression is the:
promoter
The part of the gene that is transcribed but then spliced out of the transcript is the:
intron
A plant is heterozygous for two traits and has a genotype of GgYy. How many different
genotypes will be represented in the gametes of this individual?
4
You cross two plants with genotypes GGYY and ggyy and check the genotype of the progeny.
How many different genotypes are found in the progeny?
1
If you cross a plant with green pods (GG) with plant that has yellow pods (gg), the percentage
of progeny with green pods will be
100%
According to the endosymbiotic theory, chloroplasts evolved from
cyanobacteria
Red algae are able to grow at greater depth in the ocean than other algae because they have an
alternative photosynthetic light harvesting complex called
phycobilisome
There are two main groups of green algae, the charophytes and the chlorophytes. Land plants
evolved from
charophytes
Algae found in the oceans that have a cell wall composed of silica are
diatoms
Agar, carrageenan, and algin are polysaccharides that are used the food industry. They are
produced by
algae
Fungi are chemoheterotropic and that means that fungi
obtain their energy and carbon from organic sources
Fungal cell walls are made from
chitin
The fungi we discussed in class that have swimming spores are in the
Chytridiomycota
The fungi that form endomycorrhizal symbiotic interactions with plants are in the
Glomeromycota
Nori seaweed is made of
red algae
Lichens are mostly symbiotic associations of fungi in the ___________________ with either algae or cyanobacteria
Ascomycota
In bryophytes, meiosis produces the
spores
In bryophytes, spores are produced by the
sporophyte
In Bryophytes, fertilization occurs in the
archegonium
In Bryophytes, the zygote grows and becomes the
sporophyte
In Bryophytes, the ___________________ is dependent.
sporophyte
In Lycophytes the gametophyte
is subterranean
The rhyniophytes are the first land plants to have true stems with central conducting tissue
containing lignin. The first land plants to have true stems, leaves, and roots are the
Lycophytes
Club mosses have a dominant sporophyte generation that make spores in sporangia, they do
not make seeds. They have true vascular tissue. Their gametopytes are subterranean. They belong
to the
Lycophytes
True ferns belong to the
Monilophytes
In true ferns, sori on the underside of leaves are clusters of leptosporangia that produce
spores. When the spores germinate they grow into
gametophytes
In true ferns, meiosis occurs in
leptosporangia
Stomata and a cuticle first appeared in
Bryophytes
