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The two main groups of angiosperms are
but there are 2 other sm groups..Basal Angiosperms and Magnolids
another type of angiosperm that share some traits with basal angiosperms but are more closely related to monocots and eudicots
Between the Magnolids and Basal Angiosperms which is more closely related to the monocots and eudicots
Stems: Dicot vs Monocot
D-vascular tissue usually arranged in ring; Pholem inside Xylem outside
M-Vascular tissue scattered
Flowers: Dicot vs Monocot
D-floral organs usually in groups of 4 or 5
M-floral organs usually in multiples of 3
when the pollen tube discharges two sperm into the female gametophyte within an ovule
What are the three things the 2 sperms does?
fertilizes the egg
combines with two nuclei in the central cell of the female gametophyte
initiates development of food-storing endosperm
What are tow important relationships in terrestrial ecosystems
pollination of flowers
transport of seeds by animals
The monetary value of honey bees as commercial pollinators in the US is estimated at about
15-20 billion annually
what percentage do wheat rice maize potatoes cassava and sweeet potatoes amount to in calories consumed by humans
At the current rate of habitat loss what percent of earths species will be come extinct within the next 100-200 years
anther->____-> ____->meosis->4 ___-> haploid male gamete
If pollination succeeds, a ____ produces a ____ that grows down into the ovary and discharges sperm near the embryo sac
This results form the discharge of 2 sperm from the pollen the into the embryo sac
One sperm fertilizes the egg, and the other sperm does?
combines with the polar nuclei, giving rise to the triploid food-storing endosperm
what does double fertilization ensure?
the endosperm develops only in the ovules where the egg has been fertilized
The first mitotic division of the zygote is transverse, splitting the fertilized egg into what two cells?
In some eudicots, such as the common garden bean, the embryo consists of the embryonic axis attached to
two thick cotyledons
separation of a parent plants into parts that develops into whole plants, is a very common type of asexual reproduction
Problem of asexual reproduction
a clone of a plant is vulnerable to local extinction if there is an environmental change
Benefit of sexual reproduction
generate genetic variation that makes evolutionary adaptation possible
What is another way besides that of dioecious species to prevent selfing
stamens and carpels mature at different times or are arranged to prevent like that of the Thrum and Pin flower.
Thrum-stamen tall style short; Pin flower-style tall stamen short
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