Pollen grain is enclosed by an outer wall called _____ and an inner wall called ______
Pollen grain is enclosed by exine and intine
_____ secretes chemical substances to determine compatibility
Exine secretes chemical substances to determine compatibility
______ secretes a chemical substance to digest stigma tissue
Intine secretes a chemical substance to digest stigma tissue
After pollen landed on stigma, pollen germination occur. Pollen germinates when
Pollen germinates when the tube cell produces pollen tube
As pollen tube elongates down the _____, generative cell divides by mitosis to form _ ____ ______
As pollen tube elongates down the style , generative cell divides by mitosis to form 2 sperm nuclei
The elongating pollen tube will enter ovule through the _________, then tube cell will degenerate, allowing 2 _____ _____ to enter embryo sac
The pollen tube will enter ovule through the micropyle , then tube cell will degenerate, allowing 2 sperm nuclei to enter embryo sac
Embryo sac is female gametophyte that develops inside an _____
Embryo sac is a female gametophyte that develops inside an ovule
Immature male gametophyte is
Pollen with pollen tube, tube cell and generative nucleus
Mature male gametophyte is
Pollen with pollen tube, tube cell and 2 sperm nuclei
The fusion of 2 sperms with different nuclei in embryo sac is called ______ _____________
The fusion of 2 sperms with different nuclei in embryo sac is called double fertilization
What is an embryo sac?
is a female gametophyte with 8 nuclei:
3 antipodal cells
2 polar nuclei
1 egg / ovum
2 synergids
Double fertilization occurs when 1 sperm nucleus fuse with an ____ & to form a diploid ______
And the other 1 sperm nucleus fuse with 2 ____ ____ to form a triploid ________
1 sperm nucleus fuse with an egg & to form a diploid zygote
And the other 1 sperm nucleus fuse with 2 polar nuclei to form a triploid endosperm
Egg (n) + sperm (n) = _____ (2n) that develop into _____
Egg (n) + sperm (n) = zygote (2n) that develop into embryo
2 Polar nuclei (2n) + sperm (n) = __________(3n)
2 Polar nuclei (2n) + sperm (n) = endosperm (3n)
Endosperm acts as a ___ ________ for the seed
Endosperm acts as a food storing tissue ( this ensure endosperm develop only in ovules that egg has been fertilized)
Ovules develop into _____
Ovules develop into seeds
Ovary develops into a ______
Ovary develops into a fruit
Integuments become the ___ ____
Integuments become the seed coat