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1a)Plants take in some compounds like carbon dioxide
through their leaves. They absorb some other materials
such as compounds of nitrogen, phosphorus, etc., from
the soil through their roots.
the transport system consists of tube like passages made
up of vascular tissue. There are two types of vascular
tissues in plants—xylem and phloem.The vascular naijahud.com system extends from the roots
through the stem and continues up to the leaves. In the
leaves it is clearly seen as a pattern of veins. Water and
minerals are transported from the roots upwards through
the xylem tubes.
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2a)
Enzyme is a substance produced by a living organism
which acts as a catalyst to bring about a specific
biochemical reaction.
2aii)
i)all enzymes are proteins.
ii)Enzymes possess great catalytic power.
iii)Enzymes are highy specific.
iv)Enzymes show varying degree of specificities.
v)Absolute specificity where the enzyme sreactspecifically with only one substrate.
2b)
Pancreatic fluid or juice contains digestive enzymes that
pass to the small intestine where they help to further
break down the carbohydrates, proteins,
and lipids (fats) in the chyme. Pancreatic
juice is a liquid secreted by the pancreas,
which contains a variety of enzymes
including trypsinogen,chymotrypsinogen, elastase,
naijahud.com carboxypeptidase, pancreatic lipase,
nucleases,andamylase.Pancreatic juice is alkaline in
nature due to the high concentration of bicarbonate ions.
This is useful in neutralizing the acidic gastric acid,
allowing for effective enzymic action.
2c)
most importantly,sun provides vitamin D which helps thebody absorb the minerals calcium and phosphorus from
the food that the boy eat, which is important for bone
health. While milk is the main source of dietary calcium.
Calcium is a major bone mineral, mandatory for bone
health.
2d)
i)Photosynthesis conducted by plants is also an important
part of the carbon cycle.
ii)It releases oxygen needed for breathing
iii)It serves as source of food manufacturing for human
rights
iv)It provides sources for fuel through plants
v)it help to balance the ecosystem
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Q.3ai. Microorganisms
bacteria
fungi,
viruses,
Q.3aii.
Fungi eg zygomycota
Bacteria eg streptococcus
Viruses eg HIV
Q3b
light
Water pressure,
currents,
temperature
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(4ai)
DRAW THE DIAGRAM
(4aii)
DRAW THE DIAGRAM
1 is homozygous starchy grain
2 are heterozygous starchy
1 is homozygous sugary grain
(4b)
-Starchy=3/4*500
=435 starchy grains
-Sugary =1/4*500
=145 sugary grains
6a)
i)mimicry is a similarity of one species to another that
protects one or both.
An example of this is the cuckoo bee.
ii)Camouflage is the structural adaption that enables
specie s to blend with their
surroundings; allows a species to avoid
detection by predators.
6b)
i)Their legs are adapted for running
ii)They adapts the leathery forewings as
temina to provide a protective cover for the second set of
wings.
iii)they evolved mandibles to bite and chew solid food.
6c)
i)It reduces the quality and quantity of the crops
ii)it reduces their productivity
6d)
i)by refrigerating
ii)by salting
iii)by drying
iv)by the use of silos
6e)
i)in medicine
ii)in crime detection
(6f)
-Inadequate space
-Inadequate light
-Inadequate water
-Inadequate nutrient
(6g)
It is a long term gradual series of changes occuring in
structure,composition,variety and number of species in
an area till a stable community is reached
(6h)
-It reduces soil fertility
-It reduces soil micro organism
-It causes soil leaching
-It reduces soil aeration
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Friday , 2nd September, 2016
Biology (Essay& Obj) 9.30am -12.0
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