To
prepare candidates for Monday, 31st August, 2020 WASSCE Biology Practical, I
wish to highlight these areas that will enable them make outstanding result
without cheating.
The
areas you should work on are diffusion, test for classes of food, soil
analysis, fruits and seeds, classification of living organism.
Placentation
Placentation
is the arrangement of the ovules within the ovary. These ovules are attached to
the ovary by fleshly structures called placentae (singular-placenta) through
short stalks called funicles.
Types of placentation
a. Marginal placentation: In
marginal placentation, the ovules are attached to the placenta along one margin
of the ovary. Examples can be found in beans, cowpea, pride of Barbados.
b. Parietal placentation: In
this arrangement, the ovules are attached to the slides of a syncarpous ovary
having a single chamber e.g. pawpaw.
c. Axile placentation: In
axile placentation, the carpels of syncarpous ovary meet in the centre to form
the placenta which the ovules are attached e.g. Tomato
No comments:
Post a Comment