merrylarry
Re- waec may/June assistance
(Apr 21 2015 at 10:23am)
ACCOUNT OBJ: 1-10: BADDABAACB 11-20: CADBCACBDC 21-30: DCCBDBCCBB 31-40: ABADDDABBB 41-50: BCDBACDBAD
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merrylarry
Re- waec may/June assistance
(Apr 21 2015 at 01:23pm)
3ai.
Sewage is a water-carried waste, in
solution or suspension, that is intended
to be removed from a community. 3aii.
-Increased organic matter (from the
sewage) breaking down in the river reduces the amount of dissolved
oxygen in the water body as the
decomposition process uses up the
available dissolved oxygen
-Sewage heightens the levels of
nutrients, increasing the bioavailability of nutrients, which can increase
productivity of plankton near the
sewage outfall
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merrylarry
Re- waec may/June assistance
(Apr 21 2015 at 02:15pm)
3c. An adaptation is a physical or
behavior@l characteristic that has
developed to allow an organism to
better survive in
its
environment. Adaptations are the result of
evolution, and may occur when a gene
mutates, or changes by accident. That
mutation causes
the organism to better survive and
reproduce, and it pa$$es on that trait to its
offspring. It
can take many generations to develop
an
adaptation.
Examples: One physical adaptation used in the intertidal zone is a crab’s
hard shell, which
protects it from predators, drying out
and
being crushed by waves. A behavior@l
adaptation in the oceans is the use of loud,
low-frequency calls by fin whales to
communicate with other whales over
great distances.
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merrylarry
Re- waec may/June assistance
(Apr 21 2015 at 02:16pm)
(2a)
the leaf of a flowering plant is adapted
for
photosynthesis because carbon(iv)
oxide,
water, chlorophyll, sunlight, mineral, suitable
temperature and enzymes are present.
carbon(iv) oxide is diffused into the
intercellular spaces through stomata of
the
leaves and later diffuses into the mesophyll
cells containing chloroplasts. menral
salts
derived from the soil pa$$ into the
roots of
the plant by osmoisis and dissolved mineral
salts are conducted by xylem from
roofs of
stem. the light from sunlight is trapped.
(2b)
the tapeworm is an endoparasite which carries out parasitic feeding on its host.
food is absorbed though its entire body
surface. the hooks and suckers are used
for
attachment to the intestine of the host
to avoid dislogment. the entire body
surface is
used also for the absorption of food.
(2ci)
calcium (2cii)
iodine (2ciii)
iodine
(2di)
three benefits are: -it eliminates
constipation
-it helps to stimulate movement of bowel
-it helps to balance intestinal content
(2dii)
-for growth -aids reproduction
-production of enzymes
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merrylarry
Re- waec may/June assistance
(Apr 21 2015 at 02:19pm)
3b 1. Microbial pathogens introduced by
sewage into
surface or groundwater can threaten
public
health, as well as affect ecosystem
health and function 2. Release of sewage can
degrade
vegetation and
soil by depositing harmful chemicals in
bottom
sediment, 3. With sewage comes water that has some degree of chlorine or
similar agent. The
chlorine or
other disinfectant react with organic
matter
(such as what’s in sewage) to create different end-products, such as
chloroform or
haloketons,
which can be harmful in either the
short or long term. 4.
Sewage can increase the turbidity and amount of suspended sediments. This
effect
reduces
light available for plant growth, can
smother in-
stream habitats 5. Sewage heightens the levels of
nutrients,
increasing the bioavailability of
nutrients, which
can increase productivity of plankton
near the sewage outfall 3b. Terracing is a soil
conservation practice applied to
prevent rainfall runoff on sloping
land from
accumulating and causing serious
erosion. Terraces consist of ridges and channels
constructed across-the-slope. Terracing
is also practice of creating
nearly level areas in a hillside area. The
terraces
form a series of steps, each at a higher level than the previous. Terraces are
protected
from erosion by soil other barriers.
Terraced farming is more common on
small
farms and in underdeveloped countries, since mechanized equipment is difficult
to deploy
in this setting. 3d.
An adaptation is a physical or
behavior@l characteristic that has
developed to allow an organism to better survive in
its
environment. Adaptations are the
result of
evolution, and may occur when a gene
mutates, or changes by accident. That mutation causes
the organism to better survive and
reproduce,
and it pa$$es on that trait to its
offspring. It
can take many generations to develop an
adaptation.
Examples: One physical adaptation
used in the intertidal zone is a crab’s
hard shell, which
protects it from predators, drying out and
being crushed by waves. A behavior@l
adaptation in the oceans is the use of
loud,
low-frequency calls by fin whales to
communicate with other whales over great distances. 3d.
I.
Hydrophytes 1. the moisture inside the
plants leaves its
function is to lessen water loss it does
this by not letting the water diffuse out so
easily.
The cutile is like a protective film
covering the
epidermis of the leaves it works as a
protective waxy covering and tends to be thicker on the top of the leaf.
Without it the
sun would evaporate all the moisture
leaving
the leave dry shrivelled and worth less.
2. The roots work by absorbing water and minerals to be
from
the soil and transported by the xylem
and
phloem (vascular bundle) to be used
for photosynthesis and respiration
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