Exam 3

Question 1

Located at the micropylar pole of the embryo is the:

Answer 1

basal cell

Question 2

The procambium is the precursor of the

Answer 2

xylem and phloem

Question 3

In Arabidopsis, embryonic development is thought to be coordinated by at least ______ distinct genes.

Answer 3

750

Question 4

In eudicots in which most of the endosperm is absorbed by the embryo, the cotyledons:

Answer 4

are large and fleshy

Question 5

The integuments develop into the

Answer 5

seed coat

Question 6

In grasses, the outer covering of the seed consists of the

Answer 6

mature ovary and remnants of the seed coat only

Question 7

Which of the following statements concerning the maturation phase of seed development is FALSE?

Answer 7

Cell division in the embryo accelerates

Question 8

When the seed coat is ruptured during germination, the seed

Answer 8

switches to aerobic respiration

Question 9

The ______ is usually the first structure to emerge from a germinating seed

Answer 9

root

Question 10

Which of the following statements about seed germination in onion (Allium cepa) is FALSE?

Answer 10

Germination is hypogeous

Question 11

Which of the following statements about the shoot and root apical meristems is FALSE?

Answer 11

They lose the potential to divide soon after embryogenesis is complete.

Question 12

Which of the following statements about primary growth is FALSE?

Answer 12

It results in the thickening of the stem and root.

Question 13

____________ refers to the phenomenon whereby a cell becomes increasingly committed to a course of development that weakens its ability to resume growth.

Answer 13

Determination

Question 14

______ is a simple tissue, and ______ is a complex tissue.

Answer 14

Collenchyma; xylem

Question 15

Cells that are totipotent, play an important role in wound healing, and initiate adventitious structures are:

Answer 15

parenchyma cells

Question 16

One role of pit membranes in tracheids is to

Answer 16

trap air bubbles

Question 17

______ are types of tracheary elements

Answer 17

Vessel elements and tracheids

Question 18

An example of programmed cell death is the differentiation of

Answer 18

tracheary elements

Question 19

The _____ is thought to supply the sieve-tube element with essential molecules

Answer 19

companion cell

Question 20

The cork cambium produces ______ on its outer surface and ______ on its inner surface

Answer 20

cork; phelloderm

Question 21

A spine is a modified ?

Answer 21

leaf or stipule

Question 22

The pathway by which water and nutrients move through interconnected root cell walls without entering the cell cytoplasm is called the

Answer 22

apoplastic pathway

Question 23

Root hairs are made by ___ cells and are a kind of below-ground ___.

Answer 23

epidermal; trichome

Question 24

What do we call the triploid tissue produced from the fusion of a sperm nucleus with two polar nuclei?

Answer 24

endosperm

Question 25

In which of the following ways are the pine and angiosperm life cycles similar?

Answer 25

they both release their male gametophytes as pollen grains

Question 26

Which type(s) of ground tissue cells are alive at maturity?

Answer 26

parenchyma and collenchyma

Question 27

Transfer cells are a specialized kind of which ground tissue cell type?

Answer 27

parenchyma

Question 28

White flowers that open at night and emit a strong, sweet fragrance are probably pollinated by:

Answer 28

moths

Question 29

Name a type of reward offered by plants to their pollinators.

Answer 29

nectar, pollen

Question 30

what do we call the outer parts of a primitive flower that cannot easily be divided into sepals and petals?

Answer 30

tepals