- In which of the following levels of classification are the members most similar?
A. Order
B. Genus
C. Species
D. Phylum
- The diagram represents a
A. cell
B. filament
C. colony
D. part of a living organism
- Pyrenoid is present in the structure labeled
A. IV
B. III
C. II
D. I
- Spirogyra is regarded as a multicellular plant because
A. the cylindrical cells are linked end to end
B. its cells are linked together by cytoplasmic strands
C. its cells are large
D. it is an algae containing a large vacuole
- Which of the following pairs of structures in living organisms do not perform similar functions?
A. Lungs and spiracles
B. Root hairs and mammalian hairs
C. Feathers and scales
D. Contractile vacuole and Kidneys
- Which of the following sequences is the correct arrangement of tissues in the anatomy of a young dicotyledonous stem from the inside to the outside?
A. pith, phloem, cambium, xylem, parenchyma, collenchyma and epidermis
B. Xylem, phloem, cambium, cortex, endodermis, collenchyma and epidermis
C. Pith, xylem, cambium, phloem, collenchyma, parenchyma and epidermis
D. phloem, xylem, cambium, cortex, endodermis, collenchyma and epidermis
- An animal which possesses scales, nares, and a backbone is likely to be a
A. toad
B. lizard
C. rat
D. bat
- The opening of the guard cells of the epidermis in plants is by the process of
A. osmosis
B. diffusion
C. active transport
D. transpiration
- What happens to a plant if the shoot tip is cut off and replaced by an agar block containing auxin? It will
A. stop growing
B. grow rapidly
C. continue to grow normally
D. die completely
- Anaerobic respiration results in the production of
A. more energy than aerobic respiration
B. no energy
C. an equal amount of energy to aerobic respiration
D. less energy than aerobic respiration
- Which of the following is not a skeletal tissue?
A. Plasma
B. Chitin
C. Cartilage
D. Bone
- Which of the following statements is not correct about the mammalian heart?
A. Oxygenated blood enters the left auricle from the pulmonary vein
B. The walls of the ventricle are thicker than those of the auricle
C. Blood passes from the right ventricle to the left auricle through the aorta
D. The tricuspid valve prevents the backflow of blood into the right auricle
- Which of the following organs are used for gaseous exchange in a mature toad?
A. Gills, lungs, and eardrum
B. Lungs, mouth, and eardrum
C. Mouth, skin, and gills
D. Skin, lungs, and mouth
- Which of the following statements about the diaphragm of a mammal is not correct? It
A. separates the thorax and the abdomen
B. is a thick layer of muscle
C. is made of epithelial cells
D. is part of the human respiratory apparatus
- Which of the following structures is used for respiration in insects?
A. Lungs
B. Thorax
C. Cuticle
D. Spiracles
- A substance present in the glomerular filtrate in the mammalian kidney is
A. glucose
B. fibrinogen
C. albumen
D. blood platelets
- In humans, excretion of hypertonic urine is associated with the
A. distal convoluted tubule
B. loop of Henle
C. Bowman’s capsule
D. proximal convoluted tubule
- The maintenance of a stable internal environment within the body of a mammal is known as
A. osmosis
B. plasmolysis
C. homeostasis
D. excretion
- Which part of the nephron is associated with ultrafiltration?
A. Distal convoluted tubule
B. Proximal convoluted tubule
C. Collecting duct
D. Bowman’s capsule
- Which of the following conditions would result in a decrease in the production of antidiuretic hormone?
A. Abnormally high blood sugar level
B. Drinking large quantities of water
C. Increase in osmotic pressure of blood
D. Period of strenuous exercise
- Which of the following structures is not essential in a wind-pollinated flower?
A. Anther
B. Ovary
C. Stigma
D. Petal
- Which part of the flower produces the structure labeled III?
A. Carpel
B. Pollen
C. Stigma
D. Anther
- The parts labeled III and IV respectively are called
A. pollen tube and style
B. pollen grain and pollen tube
C. anther and filament
D. stigma and style
- Which of the labeled parts would become a component of the seed after fertilization?
A. I
B. II
C. IV
D. V
- The resolution of a microscope refers to its power to
A. increase an object’s apparent size
B. distinguish clearly between two objects
C. scan the surface of an object
D. focus on an object
- The process by which plants manufacture food from carbon dioxide and water using energy from the sun is called
A. chemosynthesis
B. photosynthesis
C. anabolism
D. catabolism
- Conduction of water and mineral salts through the xylem vessels is enhanced because the xylem cells are
A. thickened with lignin
B. long, narrow tubes placed end to end
C. close to the endodermis
D. centrally placed in the roots
- Which of the following factors is likely to increase the rate of transpiration in plants?
A. A reduction in the number of stomata per unit surface area
B. Increase in humidity around the leaves of plants
C. An increase in leaf surface area to volume ratio
D. Removal of leaves from the plant
- The name of the enzyme that catalyzes the conversion of glucose to glucose-6-phosphate at the beginning of glycolysis is
A. phospho-fructokinase
B. glucose isomerase
C. hexokinase
D. glucose-6-kinase
- The correct arrangement of food classes of the same quantity in the order of magnitude of energy value in animals in descending order is
A. Carbohydrates, fats and oils, water, protein
B. Fats and oils, carbohydrates, protein, water
C. Water, fats and oils, carbohydrates, protein
D. Protein, fats and oils, water, carbohydrates
- Which of the following substances is not a complex carbohydrate?
A. Glycogen
B. Cellulose
C. Starch
D. Glucose
- Which of the following associations is an example of epiphytism?
A. Lice in the human hair
B. Mistletoe on citrus fruit
C. Egret on cow
D. Fern on palm tree
- What is the likely food of the bird in I?
A. Worms
B. Seed
C. Nectar
D. Fishes
- The food of the bird in II is
A. Worms
B. Seed
C. Nectar
D. Fishes
- Ecology simply means the study of
A. particular species of plants and animals
B. the interrelationship between organisms and their environment
C. the properties of a habitat
D. the interrelationship between plants and animals
- The maximum size of a population that a given area can support is known as
A. population density
B. carrying capacity
C. population growth
D. maximum population
- The producers in a food chain in an aquatic environment are
A. birds
B. phytoplankton
C. zooplankton
D. fishes
- The frog is considered a better swimmer than the toad because it
A. has more pronounced webbed digits
B. has much longer and stronger hind limbs
C. lives in water most of the time
D. is more streamlined than the toad
- The bacteria that reduce nitrates in the soil into gaseous nitrogen are referred to as
A. nitrifying bacteria
B. denitrifying bacteria
C. putrefying bacteria
D. saprophytic bacteria
- A pyramid of numbers is constructed by
A. comparing living and non-living things
B. measuring productivity
C. conducting census
D. labeling the living organisms
- The main reason for immunizing children is to
A. destroy pathogens in their bodies
B. increase the production of white blood cells
C. stimulate the production of antibodies
D. simulate the production of antigens
- Rhizobium, which lives in the root nodules of leguminous plants, is an example of the association known as
A. commensalism
B. epiphytism
C. mutualism
D. saprophytism
- Ascaris lumbricoides is a parasitic
A. flatworm
B. roundworm
C. arthropod
D. elastic worm
- The following organisms are pests of plants except
A. birds
B. nematodes
C. bacteria
D. rodents
- The absence of an alimentary canal in the parasitic flatworm can be attributed to the fact that
A. its body does not feed
B. it has no enzymes
C. its body absorbs digested food
D. it has suckers on the scolex
- Which of the following statements is not a reason for conserving wildlife?
A. Attraction of tourists into the country
B. Serving as a source of food
C. Serving as a source of income
D. Increasing the amount of rainfall
- Which of the following human activities would help prevent endangered species from extinction?
A. Uncontrolled killing of species
B. Regular clearing of the forest vegetation
C. Temporary maintenance of species in zoological gardens
D. Regular irrigation of their natural habitats
- In genetics, linkages refer to the linking of genes of the
A. same chromosomes
B. different chromosomes
C. same nucleus
D. different nuclei
- A man’s blood group is AB. What is the probability of the man giving birth to a child with blood group O?
A. 0%
B. 25%
C. 50%
D. 100%
- When a man who is Rh-positive marries a woman who is Rh-negative, there will be an incidence of
A. stillbirths
B. sicklers
C. albinos
D. living children
- The genotypic ratio of the offspring of a hybrid is 1:2:1, which of the following laws illustrates this ratio?
A. Use and disuse
B. Dominance
C. Segregation
D. Linkage
- The gene that is only located on the X-chromosome is said to be
A. expressed in females only
B. defective
C. sex-linked
D. expressed in males only
- If a boy has blood type O and his mother has blood type A, what is the genotype of his father?
A. BB
B. AA
C. AO
D. AB
- A man who suffers from hemophilia marries a woman who is a carrier. What percentage of their children are likely to be hemophiliacs?
A. 25%
B. 50%
C. 75%
D. 100%
- Which of the following traits may be considered in marriage counseling?
A. Height
B. Fingerprints
C. Rhesus factor
D. Color of skin
- Which of the following structures is only formed during cell division in animal cells?
A. Cell membrane
B. Cytoplasm
C. Centrosome
D. Ribosome
- The function of the drone in a colony of bees is to
A. clean the cells
B. mate with the queen
C. protect the colony
D. lay eggs
- Which of the following features is used by chameleons to escape predation?
A. fearsome appearance
B. coiling tail
C. offensive smell
D. adaptive colorations
- A scientist who was involved in the development of the evolution theory is
A. Lamarck
B. Mendel
C. Morgan
D. Pasteur
- Darwin noticed that organisms in similar habitats across the world looked alike. This illustrates
A. convergent evolution
B. adaptive radiation
C. co-evolution
D. descent with modification
