Chapter 23 Vocabulary

Question 1

dormancy

Answer 1

A period when an organism’s growth or activity stops

Question 2

hypocotye

Answer 2

the region of the stem nearest the seed and in many plants, it is the first of the seedling to appear above the soil

Question 3

radicle

Answer 3

starts absorbing nutrients from its environment

Question 4

Germination

Answer 4

the process whereby seeds or spores sprout and begin to grow

Question 5

seed coat

Answer 5

as the endosperm matures, the outside layers of the ovule harden and form of a protective layer

Question 6

tissue lendosperm

Answer 6

forms as a results of these divisions and provides nourishment for the embryo

Question 7

polar nuclei

Answer 7

the result is three nuclei at each end of the cell and two nuclei in the center

Question 8

day-neutral plants

Answer 8

A plant that flowers over a range in the number of hours of darkness

Question 9

intermediate day plants

Answer 9

many plants over a range in the number of hours of darkness

Question 10

long-day plants

Answer 10

flowers when the number of hours darkness less than its critical period

Question 11

short day plants

Answer 11

flower when exposed daily to a number of hours of darkness that is greater than its critical period

Question 12

pistil

Answer 12

female reproductive organ of a flower

Question 13

stamens

Answer 13

male reproductive organs of a flower

Question 14

petals

Answer 14

usally are colorful structures that can both attract pollinators and provide them with a landing platform

Question 15

sepals

Answer 15

protects the flower bud and can look like small leaves

Question 16

microphyle

Answer 16

opening of the ovule, can be trapped in a sticky substance called a pollen trap

Question 17

microspores

Answer 17

certain cells in these sporangia undergo meosis

Question 18

megaspores

Answer 18

within each ovule, meiosis of a cell in the megasporiagium

Question 19

heterosporous

Answer 19

are like lycophytes and pterophtyes

Question 20

prothallus

Answer 20

a tiny heart shaped gametophyte

Question 21

protonema

Answer 21

small, threadlike structure produced by mosses that can develop into the gametophyte plant, and the cycle repeats

Question 22

chemotaxis

Answer 22

responce to chemicals produced by achegonia

Question 23

vegetative reproduction

Answer 23

a form of asexual reproduction in which offspring grow from a part of a existing plant or parent plant