Skylod1 Biology ANSWERS
Biology obj
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(1a)
Blood- tissue
Guinea Pig – organism
Hebiscus Flower – organ.
Human Skeleton – System.
Plasmodium – Cell.
(1b)
Homeostasis can be defined as
the process whereby organisms
keep conditions in their internal
environment fairly constant.
(1c)
(i)The kidney is an excretory
organ.It also carries out the
maintainance of acid base
balance in the body.Due to the
fact that it is in direct contact
with the blood,when the blood
is too acidic,more acid is
removed from the blood by the
kidney and loss of base is
prevented when the
concentration a base becomes
too high more salt is excreted
(ii)
-Temperature;when the
temperature in the
environment is very high,you
sweat more and you urinate
less and when the temperature
of the body is low,you sweat
less and you urinate
more.Therefore on a cold day
the kidney works more and on
a hot day the kidney works less.
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2a)
Photosynthesis can be
represented using a chemical
equation.
The overall balanced equation
is…
6CO 2 + 6H 2O ——> C 6 H 12 O
6 + 6O 2
Sunlight energy
Where: CO 2 = carbon dioxide
H 2 O = water
Light energy is required
C 6 H 12O 6 = glucose
O 2 = oxygen
2b) Diagram of Dicotyledon leaf
and fully labeled
2c)
i)To produce substances that
break down fats,
convert glucose to glycogen,
ii)produce urea (the main
substance of urine), make
certain amino acids (the
building blocks of proteins),
filter harmful
substances from the blood
(such as alcohol),
iii)Storage
of vitamins and minerals
(vitamins A, D, K and
B12) and maintain a proper
level or glucose in the
blood.
Iv)The liver is also responsible
fore producing cholesterol.
v)It produces about 80% of the
cholesterol in your body.
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(3a)
DRAW THEW DIAGRAM
(3b)
Clay;
-it is a heavy soil
-It is very acidic
-Most crops do not grow well on
clay soil
-The particles are tightly bound
together
Sandy;
-It is easily heated up during
the day
-It has a poor mineral holding
capacity
-It has poor water holding
capacity
-It is low in organic matter
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(6a)
(i)
-Intraspecific competition
-Interspecific competition
(ii)
-teritotry
-food
-water
-gases
(iii)
(6b)
-Transpiration
-Cutation
-Sweating
(6c)
(i)Fluid feeders;mosquito,tsetse
fly
(ii)Filter feeders;duck,humming
bird
(6d)
-Cornfield layer; (i)It protect the
skin from mechanical injury
(ii) Homeostasis
-Air erector muscle:
(i)It maintains body
temperature
(ii)It maintains the streamliness
of the body
-Sebaceous gland:
(i)It lubricates the hair
(ii)It produces serum that has
anti-microbial effect
(6e)
-Increase in birth rate(Natality)
-Increase in food supply
-Decrease in death rate
-Reduction of predators
(6f)
-Controls birth rate
-Prevent unwanted pregnancy
-Reduces abortion
-Prevent overpopulation
-Improves child mother care
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