PES SS 3 Biology Mock 1 Exam 2026/27
  • 1. Which of the following organelles is common to both plant and animal cells?
A) chlorophyII
B) Cellulose cell wall
C) large vacuole
D) Cell membrane
  • 2. A plant cell placed in a solution with a higher water potential will
A) expand and then burst
B) decrease in size and become flaccid
C) expand and then shrink
D) enlarge and then become turgid
  • 3. Offspring formed by sexual reproduction exhibit more variation than those formed by asexual reproduction because
A) gametes of parents have different genetic composition
B) greater amount of DNA is involved in sexual reproduction
C) genetic materials come from parents of two different species
D) sexual reproduction is a lengthy process
  • 4. Radius and ulna are bones of the?
A) pectoral girdle
B) upper arm
C) pelvic girdle
D) lower arm
  • 5. Detoxification of urea takes place in the?
A) pancreas
B) liver
C) heart
D) testes
  • 6. The blood vessel which carries blood from the alimentary canal to the liver is the?
A) mesenteric artery
B) hepatic portal vein
C) hepatic artery
D) hepatic vein
  • 7. Which of the following hormones is suddenly secreted into the bloodstream of a frightened person?
A) insulin
B) thyroxine
C) adrenaline
D) parathormore
  • 8. The temperature control centre in mammals is located in the?
A) pituitary gland
B) hypothalamus
C) adrenal gland
D) skin
  • 9. How many gametes are produced in the pollen grain of a flowering plant before fertilization?
A) two
B) one
C) four
D) three
  • 10. Which of the following hormones is suddenly secreted into the bloodstream of a frightened person?
A) thyroxine
B) adrenaline
C) insulin
D) parathormore
  • 11. Which of the following organisms does not undergo incomplete metamorphosis?
A) grasshopper
B) cockroach
C) locust
D) butterfly
  • 12. An enzyme reaction may begin to decline when?
A) there is an increase in substrate concentration
B) the atmospheric pressure is altered
C) the ph of the medium is altered
D) the optimum temperature is attained
  • 13. Which of the following factors is not necessary for photosynthesis?
A) wind
B) water
C) sunlight
D) carbon (IV) oxide
  • 14. Autotrophic nutrition is a process whereby an organism obtains food
A) by synthesizing simple substances using energy
B) from other organisms in exchange for some products
C) in a synthesized form, from other living organisms
D) by utilizing its store energy
  • 15. The process that takes place at the light stage of photosynthesis is?
A) ormation of two molecules of phosphoglyceric acid
B) breaking down of ATP molecules to produce energy
C) splitting of water molecules to form hydrogen ions
D) reduction of carbon (IV) oxide to form carbohydrate
  • 16. The following organisms are examples of carnivorous plants except.
A) venus flytrap
B) Utricularia
C) gloriosa
D) pitcher plant
  • 17. Plants and animals of an ecosystem make up a?
A) community
B) population
C) succession
D) habitat
  • 18. The illustration below is a food chain.

    Grass→grasshopper→domestic fowl→hawk

    What would happen if the population of domestic fowl decreases?

    a
    grasshoppers would decrease

    b
    hawks would increase

    c
    grasshoppers would increase

    d
    grasses available to grasshoppers
A) grasshoppers would increase
B) grasses available to grasshoppers
C) hawks would increase
D) grasshoppers would decrease
  • 19. Rabbits cannot survive in an aquatic habitat because they have
A) no scales
B) fore limbs
C) no gills
D) lateral line
  • 20. Which of the following features is a characteristic of aquatic plants possession of ?

    a
    multiple epidermis

    b
    heavily lignified tissue

    c
    finely divided leaves

    d
    succulent stem
A) succulent stem
B) heavily lignified tissue
C) finely divided leaves
D) multiple epidermis
  • 21. An association between living organisms in which one organism lives on and feeds at the expense of the other organism is known as?
A) parasitism
B) predation
C) commensalism
D) mutualism
  • 22. Endangered species are organisms that are?
A) reproducing profusely in an area
B) dangerous to humans and attacking other animals
C) likely to disappear from the surface of the earth
D) dangerous to humans and attacking other animals
  • 23. Which of the following behaviours is correctly matched with the corresponding diseases?
A) Eating uncooked meatf/fdysentery, cholera. food poisoning.
B) Living near dirty gutter / Lung cancer, syphilis, river blindness
C) Having multiple sexual partners / liver cirrhosis, syphilis, AIDS
D) Smoking cigarette / Liver cirrhosis. Lung cancer, AIDS
  • 24. Which of the following practices is a wildlife conservation method?
A) discouraging poaching
B) mulching
C) crop rotation
D) use of cover crops
  • 25. Which of the following resources cannot be conserved?
A) soil
B) water
C) forest
D) garbage
  • 26. Which of the following statements about mitosis is not correct?
A) Bi-valents are not formed
B) chiasmata are not formed
C) It does not lead to variation
D) Four daughter cells are produced
  • 27. A mixture of blood with antigen A and blood containing antibody a will?
A) facilitate dissolution of clot
B) lead to agglutination
C) have no effect on blood composition
D) change the blood group
  • 28. Plants suitable for experiments in genetics must not
A) produce numerous seeds within a short time
B) have a relatively short life cycle
C) have a small number of chromosomes
D) produce one generation in a large period
  • 29. Which of the following statements about sickle cell anaemia is correct?
A) it is caused by recessive genes
B) two sickle cell carrier parents may have a sickling child
C) it is caused by sex-linked genes
D) it is more common in males than in females
  • 30. In humans, pointed eyebrows (B) is a dominant trait over smooth eyebrows (b). A student and the mother have smooth eyebrows while the father has pointed eyebrows. What is the genotype of the father?
A) Bb
B) BBbb
C) BB
D) bb
  • 31. A woman with Rhesus negative blood group was advised not to marry a man with Rhesus positive blood group because
A) it will hinder her from having blood transfusion from her husband
B) it may affect her childbearing ability
C) it will result in sickness and probably death of the offspring
D) her children may all resemble her husband
  • 32. Which of the following organisms exhibits division of labour?
A) butterfly
B) cockroach
C) housefly
D) termite
  • 33. Natural selection arises as a result of?
A) climate change
B) gene mutation
C) change of habitat
D) reduction in population
  • 34. Which of the following statements is not Lamarck's postulate on evolution?
A) well developed acquired characters are inheritable
B) survivors in a competitive community must have inherited useful traits
C) frequently used organs become well developed while the ones not used become vestigial
D) great changes in the environment result in corresponding changes in species
Screenshot
  • 35. a
    longitudinal and transverse

    b
    transverse and longitudinal

    c
    cross and transverse

    d
    transverse and cross
A) longitudinal and transverse
B) transverse and cross
C) cross and transverse
D) transverse and longitudinal
Screenshot
  • 36.
A) gamete formation
B) sexual reproduction
C) asexual reproduction
D) bud formation
Screenshot
  • 37. The level of organization of the organism is
A) cell
B) system
C) organ
D) tissue
Screenshot
  • 38. The organism belongs to the Phylum
A) Rhizopoda
B) Euglenophyta
C) Rhodophyta
D) Ciliophora
Screenshot
  • 39. The diagram above is an illustration of the longitudinal section of a mammalian organ. Study it and answer this question.

    Which of the labelled parts is the cortex?
A) IV
B) III
C) II
D) I
Screenshot
  • 40. The diagram above is an illustration of the longitudinal section of a mammalian organ. Study it and answer this question.

    What is the main function of the organ?
A) Excretion
B) Reproduction
C) Locomotion
D) Respiration
Screenshot
  • 41. The diagram above is an illustration of a type of eye defect in humans. Study it and answer this question.

    The eye defect illustrated in the diagram is?
A) myopia
B) astigmatism
C) presbyopia
D) hypermetropia
  • 42. The diagram above is an illustration of a type of eye defect in humans. Study it and answer this question.

    The eye defect can be corrected by the use of?
A) cylindrical lens
B) bifocal lens
C) concave lens
D) convex lens
Screenshot
  • 43. The diagram above is an illustration of the growth of a plant in a water culture. After a few days, the solution turned green and the plant died. Use this to answer this question.

    What precaution should have been taken to prevent the solution from turning green?
A) keep cotton wool around the seedling to make it dry
B) aerate the solution daily
C) cover the culture vessel with opaque paper
D) use a non-green plant for the experiment
  • 44. The diagram above is an illustration of the growth of a plant in a water culture. After a few days, the solution turned green and the plant died. Use this to answer this question.

    The death of the plant was likely caused by?
A) inadequate supply of water to the plant
B) excess supply of nutrients to the plant
C) algal growth in the solution that used up the nutrients
D) inability of the plant to make food due to lack of sunlight
  • 45. The diagram above is an illustration of the foot of an animal.

    The adaptation of this type of foot is that it is?
A) used as a paddle for swimming
B) used as a bait to catch fish in water
C) used for killing prey in water
D) effective in scratching the soil for food
Screenshot
  • 46. The diagrams above are illustrations of types of comb found in domestic fowl. Study them and answer this question.

    The types of comb show ?
A) inheritance
B) variation
C) courtship behaviour
D) cell theory
  • 47. The cell as the basic unit of life consists of
A) nucleus and cell wall
B) cytoplasm and nucleus
C) cytoplasm and vacuole
D) cell wall and vacuole
  • 48. Use the following Classes of Arthropoda to answer the question below

    I. Crustacea II. Insecta III. Arachinda IV. Chilopoda



    Which of the classes is characterised by the possession of two pairs of antennae?
A) I
B) IV
C) III
D) II
  • 49. Use the following Classes of Arthropoda to answer the question below

    I. Crustacea II. Insecta III. Arachinda IV. Chilopoda



    Which members of the classes live mainly in an aquatic habitat?
A) I
B) II
C) III
D) IV
  • 50. The organism with spiral chloroplasts and nucleus suspended by cytoplasmic strands is
A) Paramecium
B) Euglena
C) Spirogyra
D) Volvox
  • 51. The network of double membrane that conveys materials through the cytoplasm is the
A) plasma membrane
B) mitochondrion
C) endoplasmic reticulum
D) nuclear membrane
  • 52. Which of the following materials is not a living semi-permeable membrane?
A) pig's bladder
B) Yam tuber
C) Sheet of cellophane
D) Unripe pawpaw fruit
  • 53. In an experiment, mould and yeast cells were transferred into an environment with low oxygen concentration. After a few days, the mould dies while the yeast cells did not. Which of the following statements best explains the following observation.
A) The yeast cells carried out photosynthesis while the mould did not
B) Photosynthesis does not take place in the absence of oxygen
C) Respiration can take place in yeast cells in the absence of oxygen
D) Respiration does not occur in the mould
  • 54. Which of the following tissues does not provide support in flowering plants?
A) Xylem
B) Parenchyma
C) Phloem
D) Collenchyma
  • 55. The respiratory organ of a cockroach
A) air sac
B) lung
C) trachea
D) lung book
  • 56. The excretory product of some reptiles, birds and insects is
A) urine
B) urea
C) ammonia
D) uric acid
  • 57. The part of the mammalian kidney that stores urine is the
A) medulla
B) bladder
C) pelvis
D) capsule
  • 58. The properties of endocrine system include the following except
A) secretion of hormones
B) transportation by blood to target organ
C) release of secretion into ducts
D) having specific effect
  • 59. The part of the central nervous system that controls unconscious actions in humans is the
A) cerebrum
B) optic nerves
C) cerebellum
D) spinal cord
  • 60. What happens when the ciliary muscles of the eye contract? The
A) lens become more concave
B) lens gets a longer focal length
C) suspensory ligament becomes tight
D) lens become more convex
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