Lesson 17 Definitions

Question 1

alternation of generations

Answer 1

includes diploid (sporophyte) generation and a haploid (gametophyte) generation

Question 2

sporophyte

Answer 2

mitosis occurs in this generation

Question 3

gametophyte

Answer 3

flowers on angiosperms (miosis happens in this generation)

Question 4

archegonium

Answer 4

the female sex organ in mosses, liverworts, ferns, and most conifers.

Question 5

ovule

Answer 5

plant structure that develops into a seed when fertilized

Question 6

ovary

Answer 6

part of the female reproductive organ of the flower or gynoecium. Specifically, it is the part of the pistil which holds the ovule(s) and is located above or below or at the point of connection with the base of the petals and sepals.

Question 7

anther

Answer 7

the part of a stamen that contains the pollen.

Question 8

filament

Answer 8

one of the male reproductive parts of the plant. When a flower opens, the filaments can be seen inside, thrusting up like stems within the flower itself. A filament is topped by the anther. Together the anther and filament make up the flower’s stamen.

Question 9

stigma

Answer 9

a specially adapted portion of the pistil modified for the reception of pollen. It may be feathery and branched or elongated, as in such wind-pollinated flowers as those of the grasses, or it may be compact and have a sticky surface.

Question 10

style

Answer 10

a long, slender stalk that connects the stigma and the ovary

Question 11

megaspore

Answer 11

a type of spore that is present in heterosporous plants

Question 12

microspore

Answer 12

the smaller spore present in heterosporous plants

Question 13

radicle

Answer 13

the first organ to appear when a seed germinates. It grows downward into the soil, anchoring the seedling. In gymnosperms and dicotyledons (angiosperms with two seed leaves), the radicle becomes a taproot.

Question 14

hypocotyl

Answer 14

the part of the stem of an embryo plant beneath the stalks of the seed leaves or cotyledons and directly above the root.

Question 15

vegetative reproductions

Answer 15

any form of asexual reproduction occurring in plants in which a new plant grows from a fragment of the parent plant or a specialized reproductive structure.

Question 16

phototropism

Answer 16

movement or growth in response to direction, intnsity, and color of light

Question 17

geotropism

Answer 17

movement or growth in response to gravity.

Question 18

thigmotropism

Answer 18

movement or growth in response to touch