Abeka 10th Grade Biology Test 2

internode

What is the section of a twig between nodes?

adventitious

What are the special roots that grow from unusual regions of a plant called?

Phototropism

What is it called when plants grow towards light?

gametes

What are the reproductive cells called, such as egg cells and sperm cells?

radicle

What is the part of a seed's embryo that will develop into the root system of the new plant?

self-pollination

What is it called when flowers cannot be pollinated by other flowers and they must be pollinated through this process instead?

cortex

Where within a root is the food stored?

chemotropin

which of the following is NOT a plant hormone?

pith

What is the storage region called where a young woody stem stores water in soft, thin-walled cells at its center?

length of day and night

What is the chief factor determining when a plant flowers?

secondary growth

which of the following is NOT one of the factors that drives the sap stream?

vegetative reproduction

What is the process of a new plant growing from a root, stem, or leaf of an existing plant?

rind

What is the tough outer covering of a herbaceous monocot stem?

anther

What is the part of the flower that produces pollen?

sepal

What is the part of the flower that covers and protects the rest of the flower during development?

lenticels

What is the small openings in a stem's bark that allow air to enter the stem?

nut

What consists of a seed enclosed in a hard, relatively thick shell? Examples include acorns.

legume

What consists of a pod enclosing several seeds?

grain

What is produced by plants of the grass family?

berry

What is it when entire fruit is fleshy and juicy throughout?

pome

What consists of an outer fleshy layer and an inner papery core?

pollen tube

After pollination takes place, the first step in fertilization is the formation of the?

cotyledons

What are the structures of a plant embryo that contain stored food to supply the energy needed for sprouting?

root hairs

What are tiny, tubelike projections that extend from the epidermal cells of a root to absorb water and minerals?

heartwood

What is the older, inner wood of a stem that serves only as support for the stem?

endosperm

What is a developing plant embryo is surrounded and nourished by tissue called?

xylem tissue

What is another name for wood?

taproots

What kind of roots penetrate the soil deeply with relatively little branching?

vascular cambium produces xylem and phloem, which are in the wood and bark

What best explains why the vascular cambium of a woody stem is located between the bark and the wood?

An ovary has ripened

When there is a fully developed fruit on a plant, what is always true?

spreading branching

What type of branching in which a tree develops several main branches, usually close to the ground?

incomplete flower

A typical grass flower consists of stamens, pistils, and tiny sepals. It lacks petals but is protected by special bracts. What category is this flower?

rhizome

What is a horizontal, underground stem that produces new leaves, shoots, and roots?

salt pulls water out of the roots through osmosis

What best explains why high salt content in soil can kill plants?

A strawberry grows from a single flower with several pistils.

What best explains why a strawberry is considered an aggregate fruit?

Stigma

What is 29

style

What is 30

ovule

What is 31

receptacle

What is 32

pedical

What is 34

stamen

what is 33

the seed begins to absorb water

which of the following steps occurs first in the process of germination?

diffusion

the process in which substances mix through random molecular motion is called?

agent

the dispersal of dandelion seeds by the wind is an example of ________________ dispersal?

elongation

the part of a root tip in which cells grow longer is called the region of

domancy

the period of inactivity that occurs before germination is called

sexual reproduction

the type of reproduction in which sperm and egg cells unite

root cap

the structure that covers and protects the tender root tip