Lecture 6: The angiosperm life cycle 1- spore production Flashcards
1
Q
Do angiosperms exhibit heterospory
A
yes
2
Q
Where are spores produced?
A
sporangia
3
Q
where are microsporangia produced?
A
by meiosis via sporogenous tissue
4
Q
What is anther surrounded by?
A
tapetum
5
Q
What is tapetum
A
nutritive tissue in a sporangium
6
Q
What is a tetrad
A
- when the sporogenous tissue undergoes meiosis it produces a tetrad (4) microspores
7
Q
What is exine composed of?
A
sporopollenin
8
Q
How many cells is the pollen when pollen mitosis occurs after pollen germination
A
2
9
Q
how many cells is the pollen when pollen mitosis occurs before pollen germination
A
3
10
Q
true or false; angiosperms undergo a double fertilization
A
true
11
Q
What does double fertilization mean?
A
- one sperm fuses with the egg cell to give rise to diploid zygote and ultimately to new plant
- second sperm fuses with the two polar nuclei to give rise to the endosperm, which is triploid (3n)
- this is another unique feature of the angiosperm
