Bio Final: Angiosperms (2) Mono v. Di
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Number of seeds leaves
monocots: have one seed leaf, or cotyledon; stored food is around the embryo
dicots: has two seed leaves; or cotyledons; the cotyledons are part of the embryo; first leaves of the emrbyo; the part that goes on to produce the root and shoot is the radicle and the hypocotyl, respectively
Where is the food for each?
monocot: around the embryo, not inside the cotyledon, which absorbs the stored food
Every civilization had one monocot at the basis of civilization. Explain theis.
All grasses are monocots; and, they are usually the staple of civilizations. For example, wheat,corn, and rice.
monocots: three (multiples of)
dicots: four or five (roses, ex.)
What are some leaf arrangements?
alternate, where the leaf attaches to the stem; the point of attachment is called the node (only one stem)
opposite: opposite each other
whorled: three or four
A typical flower has __flower parts. What are they and what are they?
modified leaves (even lf they don't look leaflike)
sepals, petals, pistils, stamens
Explain the relation with stems
the flower occurs at the end of the stem, terminating at the end of the stem. Once a flower forms at the end of the stem, it doesn't grow anymore
Very tip of the stem where the flower attaches is called the __. The flower stalk itself is called the __. What happens is you have got __ as you go up the receptacle; and, what happens in relation to this.
four rings of flower parts
the ring of the flower parts get closer to the center of the center from outside in
Explain sepalsand petals and stamens
sepals: very leaflike
petals: farther in and higher
stamen: farther in and higher and has whatlookslikea stem called the filament and at the tip of that is the swollen area called the anther
Explain the cross section of an anther.
four pollen sacs where pollen is produced
the connective is what is between the pollen sacs
Center of the structure
pistil where seeds are locaoted
number of ovules varies
pistil has several parts: at the top is the stigma, where pollen lands; then, the neck, which can be long or small, is the stile, and the ovary is the swollen ovary
Sometimes, sepals and petals can be called __ if they look alike.
How can you tell them apart?
if you look down at the flower, they are arranged in two rings; one is higher up and the other is farther down. So, you see the different levels and know that the higher and inner one is the petal
A typical stamen has __. __ are hard to see sometimes.
What are the two varieties of pistils.
one is a simple, which means the whole pistile is made up of oneunit called a carpel, a modified leaf
the ovules might have been produced on the upper surface and then the whole thing closed so the ovules were inside
What is the difference of flowering plants and their ovules versus gymnosperms?
conifers: seeds on the cone scale with no protection
flowering: protection as they are inside
one where the seed or seeds are in a single carpel
a lot of carpels fused together and you get a compound pistil
Simple pistil; what happens to the ovule?
made up of one carpel which is a modified leaf
whats happened is the ovule was produced on the upper surface and the whole thing closed so its on the inside
simple pistil is one in which the seed or seeds are in a single carpel
carpels fused together; three can be combined together; ovules on the inside
How can you tell between simple and compound?
IFCOMPOUNT itwill have lobes on the stigma
also use razor blade to cutit open. in the cross section, youll be able to see individual units if compound
True or False:
Flowers can have more than one pistil.
true; not common
but each is simple
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