BIOLOGY 2010 paper 1 form 4
SECTION
A (20 MARKS)
Answer all questions
in this section.
1. For each of the
items (i) – (x) choose the correct answer from among the given alternatives and
write its letter beside the item number.
(i) Which of the
following is common to both plants and animals?
A Respiration
B Digestion
C An excretory
system
D Chloroplasts
E Starch grains
(ii) A flower
which possesses both stamens and carpels is said to be
A Unisexual
B Hermaphrodite
C Monoecious
D Zygomorphic
E Polymorphic
(iii) Useful
substances are retained in the kidney by
A Filtration
B Osmosis
C Selective
reabsorption
D Osmo-regulation
E Diffusion
(iv) The Monera
are also referred to as Prokaryotes. This means having:
A No nucleus
B Membrane bounded
organelles
C Simple
structures
D Reduced nucleus
E Circular nucleus
(v) Which of the
following is a characteristic of wind-pollinated flowers?
A They have large
brightly coloured petals
B They produce a
small number of pollen grains
C They have small
anthers situated inside the flower
D They do not have
nectarines
E They have large,
sticky or spiky pollen grains
(vi) Food is moved
along the oesophagus by a process known as:
A Assimilation
B Chewing
C Egestion
D Peristalsis
E Churning
(vii) Reptiles
differ from birds because:
A Reptiles do not
lay eggs while birds do
B Reptiles have a
backbone while birds do not
C Reptiles have
scales while birds do not
D Reptiles are
cold blooded while birds are warm blooded
E Reptiles have
moist skin while birds have dry skin
(viii) Removal of
predators in the ecosystem will result in:
A Decrease in the
number of producers
B Increase in the
number of producers
C Decrease in the
number of prey
D An increase in
the number of decomposers
E No significant
change
(ix) A bean plant
can either bear terminal or axial flowers. When a terminal flowered plant (T)
is pollinated with an axial flowered plant (t), the offspring produced were 200
terminal flowered and 210 axial flowered. Which of the following represents the
genotypes of the parents?
A TT x Tt
B Tt x Tt
C TT x tt
D Tt x tt
E T x t
(x) What does
selective breeding mean?
A Only pure stock
should be inbred
B The parents are
chosen to produce desired offspring
C The
encouragement of out breeding
D The parents are
chosen carefully
E The offspring
are like parents
2. Match the responses in List B with the phrases in List A by writing the letter of the correct response beside the item number
LIST A |
LIST B |
(i) Useful materials are returned to the blood stream from the glomerular filtrate |
A Diploid |
(ii) Gaseous exchange surface of insects |
B Lungbooks |
(iii) Exchange of materials between blood capillaries and cell |
C Liver |
(iv) Deamination of amino acid and formation of urea |
D Arthropoda |
(v) A substance secreted in bloodstream but brings its effect elsewhere |
E Seed dormancy |
(vi) Allows movement in three planes |
F Stem cutting |
(vii) The ability of seeds to germinate |
G Ultrafiltration |
(viii) Plant parts best for planting Irish potato |
H Ball and socket |
(ix) Chromosome occurring in unpaired set as in gametes |
I Diffusion |
(x) Body covered with a hard exoskeleton |
J Hormone |
|
|
K Neurone |
|
|
L Seed viability |
|
|
M Osmosis |
|
|
N Hinge |
|
|
O Stem tuber |
|
|
P Selective reabsorption |
|
|
Q Tracheoles |
|
|
R Haploid |
|
|
S Mollusca |
|
|
T Kidney |
Answer all questions
in this section.
3. (a) For each of
the following processes, state the site of the process, the raw materials, important
products and by-products.
(i) Photosynthesis
(ii) Aerobic
respiration
(b) Give reasons
why it is healthier tobreath through the nose than through the mouth.(6
marks)
4. (a) Explain
what is meant by the following terms:
(i) Heterotrophic
nutrition
(ii) Autotrophic
nutrition
(b) The diagram
below (Figure 1) shows the external structure of a leaf.
(i) Name the parts
labeled A, B and C.
(ii) What is the
function of the part labeled C.
(iii) What
features of the external structure show that a leaf is adapted for
photosynthesis.(6marks)
5. (a) Some
insects are harmful and some are useful to man. Argue for this statement by
giving three examples for each.
(b) In what way
are earthworms important to farmers? (8 marks)
6. (a) (i) Define
the term tropism.
(ii) State the
biological importance of hydrotropism and phototropism.
(b) How is
accommodation brought about in the human eye? (10 marks)
7. (a) Explain the
functions of the following parts of a compound microscope.
(i) Stage
(ii) Eyepiece
(b) Name four (4)
human diseases caused by viruses. (6 marks)
8. (a) Maduda on
her way to school came across a rattle-snake on the path coming right towards
her. In no time she found herself up a tree.
(i) What gave her
the ability to climb the tree so quickly?
(ii) Identify the
different processes that went on in her body during this incidence. (6
marks)
9. (a) Define the
following terms as used in Biology:
(i) Ecology
(ii) Environment
(iii) Community
(iv) Ecosystem
(b) (i) State the
difference between natural and artificial ecosystems. Give one example for each
case.
(ii) Explain why
food webs are more representative of feeding relationships than food chains.
(8 marks)
10. (a) Explain
the following:
(i) Acquired
characters are not inherited.
(ii) Ecological
pyramids taper towards the apex.
(iii) Walls of
ventricles are thicker than those of auricles.
(iv) Rate of heart
beat increases when one is frightened.
(b) Write down
three (3) differences between mitosis and meiosis. (10 marks)
SECTION
C (20 Marks)
Answer one (1) question
from this section.
11. Genetics is a
branch of Biology dealing with heredity. How can this field of Biology be
applied to everyday life?
12. The brain is the largest portion of the nervous system and very important for controlling activities in the body. With the aid of a diagram, describe the functions of the different parts of the human brain.
Explain why only humans are said to be intelligent.
13. Write an essay
on birth control methods which do the following:
(a) Suppress the
formation and/or release of gametes.
(b) Prevent the
union of gametes in fertilization.
(c) Prevent the implantation of fertilized egg.