Seed Formation Flashcards
What part of the plant becomes the seed?
The fertilised ovule
What does the fertilised ovule become?
The seed
What becomes the wall of the seed?
The integuments - walls of the ovule
How do the integuments become the walls of the seed?
They dry up
What is the wall of the seed called?
The testa
What is the testa?
The wall of the seed
How does the zygote grow?
By mitosis
What is formed by the mitotic division of the zygote?
The embryo
What is the embryo also called?
The young plant
What does the embryo consist of?
2
The future root (radicle)
The future shoot (plumule)
What is the definition of a radicle?
The radicle is the part of the plant embryo that develops into a root
What is the definition of a plumule?
The plumule is the part of the plant embryo that develops into the shoot
What is the future root?
The radicle
What is the future shoot?
The plumule
Other than forming the future root and shoot, what does part of the embryo form?
(2)
Some of the embryo cells grow to form one or two leaves
These embryonic leaves are the seed leaves or cotyledons
What is the definition of a cotyledon?
A cotyledon is a seed leaf
What are cotyledons also called?
2
Embryonic leaves
Seed leaves
How many cotyledons do monocots have?
One
How many cotyledons do dicots have?
Two
What type of plant has one cotyledon?
Monocots
What type of plant has two cotyledons?
Dicots
What is the function of cotyledons?
They become swollen with stored food especially in dicots
What happens to the endosperm nucleus during seed formation?
The endosperm nucleus divides repeatedly by mitosis to produce many endosperm cells (3n)
What forms the endosperm cells (3n)?
The mitotic division of the endosperm nucleus
What do the endosperm cells do?
These expand and absorb the nucellus
What is the role of the endosperm?
It acts as a sperm cell
What are the main foods stored by seeds in the endosperm?
3
Fats/oils
Protein
Starch
