lab 7 - homospory & heterospory

Question 1

spores develop into the____ which produce ___ which produce ____

Answer 1

gametophytes: gametangia (antheridia and archegonium) : sex cells (egg and sperm)

Question 2

in homospory, all spores are:

Answer 2

identical

Question 3

when a gametophyte bears both sexes, self-fertilization is:

Answer 3

likely

Question 4

if a plant self-fertilizes, the egg and sperm are:

Answer 4

genetically identical

Question 5

heterospory is when the spores:

Answer 5

are different! they produce different gametophytes

Question 6

in heterospory, the ability to produce spores yielding only unisexual gametophytes would be :

Answer 6

favored

Question 7

heterosporous plants must make ___ sporangia

Answer 7

two types

Question 8

in all extant polysporangiophytes, the life cycle is dominated by the:

Answer 8

sporophyte

Question 9

in polysporangiophytes like ferns and lycophytes, the spores are ___ and the gametophytes are ___

Answer 9

dispersed : free-living

Question 10

what is necessary to make seeds?

Answer 10

• branching sporophyte
• develop two types of sporangia (heterospory)
• retain megaspore in the megasporangium
• following pollination and sexual reproduction, enclose the embryo in a seed shell

Question 11

bryophytes vs ferns sporangia

Answer 11

bryos only make one sporangium per unbranched sporophyte, all spores are the same

ferns make many sporangia on their branched sporophyte (sporophyll), but all spores are still the same

Question 12

lycophytes and gymnosperms both produce:

Answer 12

cones/strobili

Question 13

cones are :

Answer 13

clusters of modified microphylls with sporangia