Lecture 17: Gymnosperms

Question 1

what are the two clades of seed plants?

Answer 1

angiosperm and gymnosperm

Question 2

common traits of ____ include: reduced gametophytes (dominant sporophyte), heterosporous (mega/microspores)

Answer 2

seed plants

Question 3

what structure makes megaspores?

Answer 3

megasporangia

Question 4

what structures makes microspores?

Answer 4

microsporangia

Question 5

components of an ovule:

Answer 5

megasporangia, megaspore, integument

Question 6

how many integuments do gymnosperms have?

Answer 6

1

Question 7

how many integuments do angiosperms have?

Answer 7

2

Question 8

protection from environmental stress, ovule that protects against UV, and being able to obtain nutrients from parent plant are all advantages to having _____

Answer 8

dominant sporophyte (reduced gametophyte)

Question 9

advantages of pollen:

Answer 9

eliminates the need for water transport

Question 10

what turns into pollen grains?

Answer 10

microspores

Question 11

seeds have a seed coat that derived from the ____

Answer 11

integument

Question 12

gymnosperms have ____ seeds, they are exposed on sporophylls that form cones

Answer 12

naked

Question 13

most gymnosperms are ____

Answer 13

conifers

Question 14

what are the components of a seed?

Answer 14

sporophyte embryo, food supply (from leftover female gametophyte), protective seed coat

Question 15

dominant sporophyte, development of seeds from fertilized ovule, transfer of sperm to ovule by pollen, and alternation of generations are all parts of the ________

Answer 15

gymnosperm life cycle

Question 16

can evergreens carry out photosynthesis all-year round?

Answer 16

yes! except when they are frozen

Question 17

what are some of the key points of pollen dispersal?

Answer 17

growth in spring, released in large quantities, on lower branches, use wind to disperse