bio 21-24

Sugar is produced in ____________ and then moves to _________________.

A source, a sink

The dropping of leaves, fruit, and flowers is called:

Abscission

Which of the following gives the water column in the stem of plants extra strength and prevents the water from slipping back?

Adhesion

Which of the following belong to the phloem?

Companion cells

Which of the following is responsible for providing proteins to the sieve-tube members in plants?

Companion cells

. If you were studying a growth-promoting hormone that brings about internode elongation of the stem cells, you would be studying which of the following?

Gibberellins

If you were studying the flower structure which develops within the female gametophyte, you would be studying which of the following?

Megaspore —> Egg

_____________ cells are relatively unspecialized ground tissue cells, and correspond to a generalized plant cell.

Meristem

Which statement about mycorrhizae is incorrect?

Most plants lack mycorrhizae

Which of the following is false with respect to the phytochrome receptor?

Pr promotes flowering in short day plants

Which is the correct order of the stages in the development of an embryo and endosperm in the seed?

Proembryo, globular, heart, torpedo, mature

What is the correct order in the signal transduction pathway?

Reception, transduction, response

A plant physiologist is studying the structures found on plants which increase the absorptive capacity of the roots. Based on this information you would conclude that he or she is studying which of the b

Root hairs

After an injury or pruning, some plants appear to "bleed" as water exudes from the site. This is mostly due to which of the following?

Root pressure

Which of these associations is incorrect?

Sclerenchyma cells-Cell division

If a biologist is studying chemical defense in plants, he or she would most likely be studying which of the following?

Secondary metabolites

Once the pollen has been transferred from the male to the female, how does the sperm get to the egg?

Sperm travels through the pollen tube where it under goes double fertilization: sperm and egg fuse and sperm and polar nuclei fuse

Which of the following is the first step in the pressure-flow model?

Sugar is actively transported into the phloem

Which of the following would cause a leaf cell to become turgid?

The inflow of potassium followed by an inflow of water

Which of the following structures will ultimately become the seed in plants?

The ovules

If you were to place some auxin on one side of a tipless coleoptile, what would be the result?

The shoot would bend away from the auxin

If you were a plant physiologist studying the male parts of a flower, which of the following would you be interested in studying?

The stamen

A plant physiologist is studying the part of the flower which is used for catching pollen. He or she would be studying which of the following?

The stigma

If you were studying the rate of gas exchange that takes place in the leaves of plants, you would be studying which of the following?

The stomata

Which of the following is not a function of the apical meristem of plants?

To begin growth of new cells, in young seedlings at the tips of the roots and shoots

Which of the following is not a function of the stem in most plants?

To produce carbohydrates. Actual functions: supports the leaves and flowers, growth of stem, transports of water and nutrients between leaves and roots, food storage (sometimes)

If you were a plant physiologist studying the components of xylem, you would be studying which of the following?

Vessel elements and tracheids

Double fertilization in angiosperms produces:

a diploid zygote and a haploid polar nucleus

If you were studying the water-proofing strip which surrounds the cells of the endodermis and forces water to pass through the cells of the endodermis instead of around them you would be studying

active transport

If you were studying the mechanism which moves water up the stem you would be interested in all of the following except:

cohesion

In the root, water enters the xylem primarily by which of the following?

diffusion

The term secondary growth refers to an increase in

girth

When a plant tracks the sun by means of turgor pressure changes in the petiole, this is called:

heliotropism

Which of the following is the benefit of a plant having mutualistic fungus on or in its roots?

increase in water absorption

A plant physiologist is studying conditions which affect the germination of seeds. After many years of research, he or she has determined that ____________ is the least important in affecting the germination of seeds.

light

A biologist is studying an unknown species of plant and observes the following characteristics: the root xylem and phloem are in a ring, the vascular bundles are scattered throughout the stem, and the leaf veins form a parallel pattern. Based on these observations, the biologist could safely conclude that the plant is

monocot

The male gametophyte in flowering plants will be found within the:

pollen grain

Guard cells open a stoma because

potassium ions move into the guard cells followed by water moving in

The function of the endosperm is to:

provide nutrients to the embryo

Woody plants have large trunks composed mostly of

secondary xylem

A plant physiologist is studying plants which flower when the day length is shorter than a critical length, such as goldenrod and poinsettia. Based on this information you can infer that the plant physiologist is studying these types of plants:

short-day plants ex: poinsettias, Easter lilies, and some soybeans

The pollen grain contains the:

sperm

Alternation of generation in flowering plants includes the formation of a:

sporophyte generation

Water is transported in vascular plants through which of the following?

xylem