Envs 150 foret exam 3

Bright red or yellow odorless flowers with long floral tubes are most likely to use pollination by:

birds

________________________ is the most common type of seed dormancy.

quiescence due to lack of water

________________________ is the deposition of pollen on the stigma.

pollination

White musky flowers which open at night are most likely to use pollination by:

bats

A cross between two heterozygous plants produces the following phenotypic ratio of dominant to recessive

3:1

If in a population of flowers the large ones are preferentially pollinated by birds and produce more large-sized flowers in the following years, what type of natural selection is this?

directional selection

Which is NOT a factor causing evolution

Acclimation

Chromosomes

a. all are correct
-are histones surrounded by the DNA double helices
-vary in number among different species
-form the genome of an organism
- are found in the nucleus

Biopharming is plant breeding to produce:

genetically modified plants that mass produce pharmaceuticals

Which of the following describes the study of evolution?

a and b
-a. How life forms changed over millennia
-b. How organisms continue to change

What applies to climacteric fruit?

Burst of ethylene synthesis followed by high cellular respiration

What term is used for a stimulus like light that comes from outside the plant?

exogenous

Which of the following is/are part of a hypersensitive response in plants?

d. All are correct
-Results in production of toxic compounds killing invaded cells
-Results in starvation or killing of intruding organism
-Results in stronger cell walls
- Is a reaction when they are intruded by bacteria, virus, or fungi

What term is used for a stimulus like light that comes from outside of the plant?

exogenous

A rose flower contains petals, sepals, stamens and a pistil. Therefore it can be described as being ____________ and _______________.

complete and perfect

_____________________ is a stage in seed germination.

imbibition

The juicy fleshy part of an orange that you eat is called the __________________.

endocarp

Which of the following genotypes where W means dominant white flower will NOT have the white flower color?

ww

Which of the following statements best describes evolution?

Evolution is a change in allele frequency from one generation to the next.

A protein is a chain of _______________.

amino acids

A plant not affected by photoperiod is said to be ____________.

day-neutral

Systemic acquired resistance

Occurs in response to an attack on the plant

_______________ is the formation of a fruit without seeds.

parthenocarpic

Which of the following is the most likely method of seed dispersal for a kernel of corn?

gravity

Which of these is an aspect of sexual reproduction

-- all are correct
a. Produces seeds
b. Requires two parents
c. none are correct
e. Produces genetically different plants

Cross-pollination occurs when _______.

pollen from a genetically different plant fertilizes the ovule.

Based on natural selection, which moth's allelle frequencies will increase in subsequent generations?

If most trees are dark, then the dark moths will increase AND if most trees are light, then the light moths will increase.

When a diploid organism has two alleles that are the same it is called _____________ for that characteristic.

homozygous

What hormone can be used in the greenhouse and in tissue culture to stimulate adventitious shoot formation.

cytokinins

A plant that flowers when the nights get shorter:

long day

Based on the experimental results shown in the diagram, what is the most likely explanation for the plants growing toward the light source?

The plant senses light at its tip and the signal for growth is sent to the side of the plant away from the light source.

The acid growth hypothesis refers to the following:

The role of auxin in loosening cell walls through acidification and expansin activation

All the sepals of a flower are called the ________________.

calyx

What is the term for when the gene pool of a population changes because when individuals with certain phenotypic characteristics are preferred?

nonrandom mating

Which methods are NOT used by plants to protect themselves against pathogens and herbivores?

Become dormant

Which statement is NOT correct for plant hormones?

Always move in the xylem