A.the ratio of their surface area to volume is small
B.metabolic waste products diffuse to the surface of the organisms
C.the rate at which nutrients and other substances diffuse increases
D.substances to be transported move shorter distances to reach the numerous cells
E.the internal structures of the organisms are in direct contact with the environment.

Objective

Question 11

In complex food relationships in a community, the primary, secondary and tertiary consumers are referred
to as

A.symbionts
B.omnivores
C.heterotrophs
D.autotrophs
E.carnivores

Objective

Question 12

The cell membrane of a cell is said to be semi-permeable because

A.it allows only large molecular substances to pass through it into the cell
B.it is actively involved in energy production in the cell
C.it actively allows all substances to pass through it by diffusion
D.it is actively selective in allowing substances pass through it
E.fatty acids are only the building blocks of the membrane

Objective

Question 13

The function of the part labelled I is

A.controlling water loss
B.trapping solar energy
C.absorbing water
D.storing sugar
E.transporting sugar

Objective

Question 14

The part labelled ll is the

A.stoma
B.palisade cell
C.spongy cell
D.guard cell
E.epidermal cell.

Objective

Question 15

The structure that will be stained blue-black by iodine is labelled

A.I
B.II
C.III
D.IV
E.V

Objective

Question 16

In the anaerobic stage of respiration, the net ATP molecules produced per
glucose molecule

A.one
B.two
C.three
D.four
E.five

Objective

Question 17

Reabsorption of the metabolic products along the kidney tubules is made possible by the

A.closeness of the intestine to the kidney
B.convoluted nature of the tubules
C.presence of convoluted tubules in the medulla
D.presence of network of capillaries around the convoluted tubules
E.joining of the main collecting tubules to the kidney tubules

Objective

Question 18

Hormones are transported around the mammalian body by

A.water
B.nerves
C.blood
D.osmosis
E.diffusion

Objective

Question 19

Which of the following is not a function of insulin?

A.Accelerates the rate at which glucose is converted to glycogen
B.Promotes the uptake of glucose by tissues
C.Regulates the amount of glucose in the blood
D.Accelerates the absorption of glucose at the glomerulus
E.Stimulates muscles to oxidize glucose.

Objective

Question 20

Which of the following is the correct route of transmission of impulses along a reflex arc?

A.Receptor → sensory neurone → synapse → intermediate neurone → synapse → motor neurone → effector
B.Receptor → motor neutron e synapse → intermediate neurone → synapse → sensory neurone effector
C.Receptor → synapse → sensory neurone → intermediate neurone → synapse → effector → motor neurone
D.Effector → motor neurone → synapse → sensory neurone → synapse → intermediate neurone → receptor
E.Effector → intermediate neurone → synapse → motor neurone → synapse → sensory neurone → receptor.

Objective

Question 21

Which of the following statements is false?

A.Human sense of smell is easily fatigued
B.The skin can perceive the sensations of touch, pain, pressure and temperature
C.Taste buds and olfactory cells are active when wet as well as when dry
D.Sensory nerve endings receive stimuli and send to the central nervous system
E.Senses of smell and taste can be weakened by catarrh or blocked nose.

Objective

Question 22

The following are directly involved in transmission of sound waves to the brain except

A.eardrum
B.auditory meatus
C.auditory ossicles
D.eustachian tube
E.cochlea

Objective

Question 23

The term syncarpous is used to describe a flower when the carpels are

A.many and fused
B.two only
C.two and separate
D.many and free
E.lying at different parts of a flower

Objective

Question 24

Which of the following structures are characteristics of insect pollinated flowers?

A.Dull coloured flowers with no nectar
B.Very light numerous and pendulous stamen
C.Brightly coloured petals, scent nectar
D.Flowers are usually small and inconspicuous
E.Stigma are large, feathery and hang outside the flower

Objective

Question 25

Which of the following statements is not correct?

A.Shortage of food may be caused by pestilence, rinderpest and neglect of farming
B.Shortage of food may lead to competition, emigration, death and decline in the rate of reproduction
C.Over-crowding may lead to scarcity of food
D.Dispersal of seeds and fruits prevents overcrowding
E.Territorial defence encourages food scarcity in a habitat

Objective

Question 26

Which of the following is an advantage of dispersal of fruits and seeds? It allows

A.fair distribution of source of food for animals
B.growth in close association with parent plant
C.even distribution of plants and reduction of intraspecific competition
D.keen competition for food
E.the seeds to evolve new species

Objective

Question 27

The series of changes that occur in a seed by which the embryo develops into a seedling is known as

A.fertilization
B.gametogenesis
C.pollination
D.germination
E.regeneration

Objective

Question 28

Which of the following organisms has a symbiotic relationship with green algae?

A.Amoeba
B.Paramecium
C.Hydra
D.Euglena
E.Chlamydomonas

Objective

Question 29

At the end of photosynthesis, the green leaf is tested for starch and not glucose, because

A.the glucose is used up immediately to provide energy for the needs of the leaf
B.the glucose formed is immediately converted to starch
C.starch is stored only in leaves
D.there are no chemicals for glucose test in leaves
E.it is easy to test for starch

Objective

Question 30

Which of these processes removes carbon from the atmosphere?

A.Putrefaction of animals
B.Burning of fuels
C.Photosynthesis
D.Volcanic eruption
E.Respiration in plants

Objective

Question 31

Which of the following conditions is not necessary for photosynthesis to occur in plants?

A.There must be light
B.There must be xylem tissue used to conduct water
C.There must be chlorophyll to trap radiant energy
D.Carbondioxide must be present
E.Water must be present

Objective

Question 32

The distribution of organisms in a fresh - water habitat like a stream or pond is determined by the following
except

A.rainfall
B.temperature
C.pH of soil
D.light penetration
E.tidal movements

Objective

Question 33

Which of the following is characteristics of a swamp?

A.Vegetation with stratified arrangement
B.mesophytes with broad leaves
C.The ground is flooded most of the time
D.Predominance of climbing plants
E.Many plants with tire resistant structures

Objective

Question 34

Very low annual rainfall, sparse vegetation, high day temperatures and cold nights are the characteristics
of the biome known as

A.swamp
B.tropical forest
C.southern guinea savanna
D.afro alpine
E.desert

Objective

Question 35

Which of the following conclusions
cannot be drawn from the graphs?

A.Ion is taken up more rapidly at suitable temperature
B.Suitable oxygen concentration increases ion uptake
C.Ion uptake requires energy from aerobic respiration of sugar
D.Ion uptake occurs most rapidly in adequate supply of, respiratory substrate
E.The quantity of ions absorbed is inversely proportional to the quantity of carbohydrate (sugar) synthesized.

Objective

Question 36

Which of the temperature ranges will likely favour the plant best?

A.0 -10^oC
B.15.-20^oC
C.30- 40^oC
D.45 - 50^oC
E.above 50^oC

Objective

Question 37

Which of the following is the correct chain for the organism found in an aquatic community?

A.Paramecium, Phytoplankton, Prawn, Waterflea, Tilapia, Shark
B.Waterflea, Paramecium, Phytoplankton, Prawn, Tilapia, Shark
C.Phytoplankton, Waterflea, Paramecium, Prawn, Shark, `tilapia
D.Phytoplankton, Paramecium, Waterflea, Prawn, Tilapia, Shark
E.Paramecium, Phytoplankton, Waterfiea, Prawn, Shark, Tilapia

Objective

Question 38

In a food chain the position occupied by an organism is called

A.the trophic level
B.energy level
C.the feeding level
D.the habitat level
E.niche

Objective

Question 39

Which of these statements about food chain is not correct?

A.Animals in the chain are consumers
B.A food chain usually begins with a green plant
C.All organisms in a food chain are animals
D.Living things are dependent on one another
E.The food chain involves energy transfer in an ecosystem

Objective

Question 40

Which of these is not applicable to the circulation of water- in nature?

A.Water removed from oceans are Permanently lost
B.Water constantly evaporates from the seas, rivers, lakes and soil
C.Water vapour rises. cools, condenses and precipitates as rain and dew
D.Water is absorbed by plants and animals from their external environment
E.Plants lose water by transpiration and decay

Objective

Question 41

An association between two organisms in which both benefit is called

A.parasitism
B.commensalism
C.symbiosis
D.Predation
E.competition

Objective

Question 42

Which of the following is not an outcome of ecological succession?

A.There is a progressive change in species structure, organic matter and energy flow
B.The climax stage consists of a comparatively long lasting species composition
C.There is no dynamic equilibrium between the community and habitat in the climax stage
D.Communities occurring later in the sequence of succession are more complex
E.There are fewer dominant species in the late stages of succession.