SECTION A :OBJECTIVES
1. Which of the following parts of the mammalian brain is involved in taking the decision to run
rather than walk?
(a) Cerebellum (b) Medulla oblongata (c) Cranial nerves (d) Cerebrum
2. The brain and spinal cord make up the ____
(a) peripheral nervous system (b) automatic nervous system (c) central nervous-system (d)
sympathetic nervous system
3. Which of the following is not an involuntary action?
(a) vomiting (b) salivation (c) heartbeat (d) chewing
Study the diagram and answer the following questions 4 to 6
4. What handicap would result from damage to number 3?
(a) body balancing will be affected (b) the person is unable to see (c) the person is unable to
walk (d) the person is unable to speak
5. What is the function of the part labelled 1?
(a) responsible for coordinating the muscular activity for body (b) responsible for sight (c) it
governs all mental activities (d) translating the impulses into messages
6. What is the function of the part labelled 5? It
(a) controls several involuntary activities, such as heart beat, breathing(b) conducts impulses to
the spinal cord (c) control voluntary actions, such as walking (d) interprets stimulus in the spinal
cord
7. The part of the brain that controls hormonal system is (a) Hypothalamus (b) Optic lobe (c)
Auditory love (d) Pituitary gland
8. The transmission of the nerve impulses along the axon is.............in nature
(a) Gravitational (b) Chemical (c) Electrical (d) Ionical
9. The cerebellum of the brain controls ____
(a) reflex action (b) muscular activity (c) emotional expression (d) endocrine system
10. The neuron that relay the message of effectors organs or away from the central nervous
system are called
(a) efferent neurons (b) intermediate neurons (c) afferent neurons (d) spinal nerves
12. The structure that detects mechanical stimulus such as sound, gravity, pressure, pain, and
vibration is
(a) Mechanoreceptor (b) Chemoreceptor (c) Thermoreceptor (d) Photoreceptor
13. Which of the following parts of the’ tongue does not correspond to the taste indicated
against it?
(a) Tip-sweet (b) Centre salt (c) Back-sour (d) Side-sour (e) Back-bitter
14. Which of the following stimuli are not perceived through the skin of mammals?
(a) Light (b) Pressure (c) Pain (d) Heat
15. The eyeballs are attached to the eye socket by.............muscle
(a)Two (c) Three (c) Six (d) One
16. An eye defect where images are formed at the back of the retina is
(a) Myopia (b) Hypermetropia (c) Hypermyopia (d) Conjunctivitis
17. The major functions of the ear are
(a) Balancing (b) Hearing (c) Pairing (d) Hearing and balancing
18. The most sensitive part of the retina is called
(a) blindspot (b) conjuctiva (c) fovea centralis (d) choroid coat
19. Which of the following parts of the eyes is not involved in image formation
(a) Retina (b) Lens (c) Pupils (d) Blindspot
20. The part of the brain that is responsible for hearing is
(a) Hypothalamus (b) Pituitary gland (c) Optic nerve (d) Auditory nerve
21. The following are directly involved in transmission of sound waves to the brain except
(a) eardrum (b) auditory meatus (c) cochlea (d) eustachian tube
22. Which of the following statements about short sight is not correct?
(a) the eye ball is too short (b) the cornea of the eyeball is too curved (c) the images fall in front
of the retina (d) it can be corrected by using concave lenses
23. A group of organisms of the same species living in a particular place is known as (a) colony
(b) ecosystem (c) niche (d) Population
24. A good site for secondary succession would be
(a) A sand dume (b) a bare rock (c) a land that has just had forest fire (d) a stretch of barren land
25. Density, mortality rate, birth rate are the factors that affect
(a) population (b) dominance (c) habitat (d) abiotic community
26. An adaptation to avoid overcrowding is
(a) Immigration (b) Dispersal of seed (c) Territorial behaviour (d) Life cycle and lifespan
27. The following are biotic components of an ecosystem
(a) temperature (b) oxygen (c) bacteria (d) soil
28. Which of the following Ecological factors will result in food shortage?
(a) drought (b) low rate of reproduction (c) emigration (d) topography
29. In a population, food shortage may lead to
(a) an increased survival rate (b) high reproduction rate (c) intra-specific competition (d) low
rate of migration
30. The natural dwelling place of an organism is called it’s ___
(a) Ecological niche (b) habitat (c) population (d) environment
31. Sterlisation in females involve cutting and tying the ______
(a) ureter (b) fallopian tube (c) urethra (d) uterus
32. Which of the following associations can upset the balance of nature?
(a) Epiphitism (b) Parasitism (c) Symbiosis (d) Saprophytism
33. During mating, the male toad holds the female with its?
(a) sticky tongue (b) jelly (c) webbed hind limbs (d) nuptial pad
34. Which of the following is the least safe method of birth control? Using
(a) spermicide creams (b) contraceptive pills (c) barriers such as condoms (d) the withdrawal
method
35. Which of the following natural resources is most readily available to all organisms? (a) water
(b) oil (c) air (d) food
36. Surgical removal or cutting of the sperm duct or vas deferens is known as
(a) vasectomy (b) Castration (c) Tubal ligation (d) Oviductomy
37. The structure of the embryo which develop and makes contact with the uterine wall is
known as
(a) umbilical cord (b) placenta (c) allantois (d) amnion
38. Which of the following mammalian features acts as a shock-absorber to the developing
embryo?
(a) amniotic fluid (b) amnion (c) umbilical cord (d) placenta
Use the diagram below to answer question 39 - 40
39. In the diagram, the function of the part labelled 2 is to?
(a) produce egg cells (b) protect sperms during fertilization (c) secrete hormones during coitus
(d) protect the developing embryo
40. The embryo is implanted in the structure labelled
(a) 1 (b) 3 (c) 4 (d) 5
41. The monthly release of an egg by the ovary is called (a) gestation (b) ovulation (c)
implantation (d) menstruation
42. Which of the following vertebrates incubates their eggs? (a) Mammals (b) Birds (d)
Amphibians (d) Reptiles
43. Identical twins inherit their genes from (a) different sperms and many ova (b) different
sperms, different ova (c) the same ovum and different sperms (d) the same sperm and ovum
44. The following is not parts of a male reproductive system (a) penis (b) vulva (c) scrotum (d)
cowper’s gland
45. About 30 days after fertilization the eggs of a cockroach hatch into a miniature of offspring
called
(a)Wriggler (b) Caterpillar (c) Image (d) Nymph
46. The product of the fertilization in the ovary of flowers results into
(a) Seed (b) Pericarp (c) fruit (d) receptacle
The diagrams below are illustrations of two different cells involved in biological processing in
mammals. Study them and answer this questions 47 to 48
47. Which parts of P and Q fuse to complete the biological process?
(a) III and I (b) IV and I (c) III and II (d) IV and II
48. Which of the following statements about P and Q is correct?
(a) Both cells are structures for asexual reproduction (b) Both cells normally belong to the same
individual (c) Both cells are found in plants (d) the union of both cells gives rise to a new
mammal
49. A dry dehiscent fruit breaking into many parts each with one seed, is a
(a) Legume (b) Capsule (c) Schizocarp (d) Caryopsis
50. The main difference between a seed and a fruit is that a fruit
(a) is large while a seed is small (b) has two scars while a seed has one (c) is pigmented while
seed is not (d) can be dispersed by animals while a seed cannot
THEORY
ANSWER 5 QUESTIONS ONLY
1a. Name the part of the human brain which is concerned with the following :
(1) Seat of memory (2) Coordinates muscular activity.
(2mks)
1b. With the aid of a labelled diagram only, 10cm to 12cm describe the structure of a neuron
(4mks)
2a. Explain the following terms:
(i) voluntary action. (ii) involuntary action.
(2mks)
2b.Describe the mechanism involved when you accidentally touch a very hot object and
immediately withdraw your hand. (4mks)
3a. State the number of chromosomes present in a human; (2mks)
I. Female gametes II.Zygote
3b. Define the term gestation. What is the normal gestational period of the developing human
embryo?
(3mks)
3c. In man, testes lie outside the abdomen. Give reason (1mk)
4a. In a tabular form, List three(3) differences between reproduction in mammals and in
amphibians.
(3mks)
4b. Explain briefly how the structure of the sperm cell relate to their functions. (not more than
3)
(4mks)
5a. Explain the term “Ecological succession”.
(2mk)
5b. Outline the process of succession in an abandoned farmland. (4mks)
6a. Define overcrowding.
(2mks)
6b. Explain briefly four(4) factors that causes overcrowding .
(4mks)
7a. What is family planning?
(2mks)
7b.i. Enumerate two(2) methods of birth control in Human .
(2mks)
7b.ii. Give two(2) reasons why family planning is important to a nation. (2mks)
8a. What are sense organ?
(2mks)
8b. State two(2) functions of tears ? (2mks)
8c. State two(2) differences between human eyes and camera (2mks)
9a.Describe the processes that will cause a person who has been spinning to feel dizzy (2mks)
9b. Give the biological term for the part labeled A, B, C and E. (4mks)
10a. State four(4) conditions necessary for seed germination. (2mks)
10b.What is germination? State two type of germination (2mks)
10c. Differentiate between Berry and Drupe. (diagram is necessary) (2mks)
