Biology 2018

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A group of closely related organisms capable of interbreeding to produce fertile offspring are known as members of a

kingdom

class

family

species

A beaker of pond water containing few specimens of Euglena was placed in a dark room for two weeks. At the end of this period, the specimens of Euglena were still alive because they were

able to carry out holozoic nutrition

able to carry out photosynthesis using carbon dioxide in the pond water

better adapted to life in darkness than to life in light

not overcrowded

The cytoplasm of the cell is considered a very important component because it

regulates the amount of energy in the cell

suspends all cell organelles

is the outermost part of the cell

is solely responsible for cell division

After an hour, the level of water in the thistle funnel will

Use the diagram below to answer question 4 to

Rise

Fall

Remain the same

Doubles

The experiment is used to demonstrate the process of

transportation

water culture

diffusion

Osmosis

In a plant cells, the role of the membrane is played by the

nucleolus

cell wall

cytoplasm

mitochondrion

Red blood cells were found to have burst open after being placed in distil for an hour. This phenomenon is known as

plasmolysis

diffusion

haemolysis

wilting

The curvature movement of plants in response to the stimulus of water is called

hydrotropism

geotropism

Phototropism

thigmotropism

The overall reaction in glycolysis can be summarised as

C6H12O5 –C3H4O3 + 4H + ATP

C6H12O6 —- 2CH4O3 + 4H + 2ATP

C6H12O6—> 2CH4O3 + 4H + ADP

C6H12O6 2C3H4O3+ 4H + 2ADP

The longest bone in the body is the

humerous

femur

scapula

tibia

Which of the following structures is not a skeletal material?

Chitin

Cartilage

Bone

Muscle

The reason why the flow of blood through the capillaries is very slow is

because the walls of capillaries are very thin

to avoid high — blood pressure

to ensure that the individual does not get dizzy

to allow adequate time for exchange of materials

Which of the following groups of organisms has kidney as their excretory organ?

Fishes, amphibians, birds, man

Fishes, amphibians, annelids, insects

Fishes, reptiles, birds, tapeworms

Fishes protozoans, amphibians, man

Which of the following features is not a characteristic of arteries? Arteries

possess values at internals throughout their length

have thick muscular and elastic walls

transport oxygenated blood with the exception of the pulmonary artery.

carry blood away from the heart

Which of the statements below is valid?

The graph below shows the results of a laboratory investigation which measured the body temperatures of a lizard and a bird under changing artificial conditions.

The bird’s blood was always warmer than that of the lizard.

The body temperature of the bird varied less than that of the lizard during changes in environmental temperature.

The body temperature of the bird remained constant despite changes in environmental temperature.

The body temperature of the lizard was always close to that of the environmental temperature

What physiological term can be used to describe the regulation of the body temperature of the lizard?

Homeostasis

Homeothermy

Poikilothermy

Osmoregulation

The reason why hospitals use saline solutions as drip instead of water is

because salt is a preservative

to prevent contamination of the body

to maintain the composition of body fluids

to increase the number of blood cells

The part of the ear which contains nerve cells sensitive to sound vibrations is the

cochlea

ampulla

tympanum

malleus

Spectacles with convex lenses correct long-sightedness by

converging the Light rays before they enter the eye

diverging the light rays before they enter the eye

reducing light intensity before it enters the eye

increasing light intensity before it enters the eye

A seed of a flowering plant can best be described as

radicle and plumule

the developed ovule

the embryo and endosperm

developed ovary

Which of the following processes removes carbon from the atmosphere?

Putrefaction

Photosynthesis

volcanic eruption

Burning fuels

Which of the following cycles involves the process of precipitation and transpiration?

Water cycles

Carbon cycle

Nitrogen cycle

oxygen cycle

What is the critical limiting factor for plants below the photic zone in an aquatic ecosystem?

Availability of nutrients

Availability of water

intensity of light

Carbon dioxide concentration

Which of the following instruments is used to estimate the number of plants in a habitat?

Pooter

Pitfall trap

Quadrat

Sweep net

Which of the following statements is true about sandy soil? It

has limited air space

is light and easy to dig

drains slowly

is heavy and poorly aerated

Which of the following organisms is a primary consumer?

Dog

Sheep

Grass

Fungus

The organism designated P in the food chain above is normally sustained by energy from

The organism designated P in the food chain above is normally sustained by energy from

P→Q→R→S→T

Sunlight

Carbohydrates

green plants

mineral salts

Which of the following statements best describes the organism designated R? It

feeds on S

is a primary consumer

is a producer as well as a consumer

is a secondary consumer

Which of the following diseases is not hereditary?

Albinism

Scabies

Haemophilia

Colour blindness

The immediate product of meiosis in flowering plants is the

sporophyte

gametophyte

zygote

pollen grains

DNA in eukaryotic cells is contained in the

central vacuole

nucleus

lysosome

golgi body

A man who is heterozygous for the disease haemophilia marries a woman who is double recessive for haemophilia. What percentage of their offspring would have the disease?

25%

50%

75%

Cytokinesis of mitosis is a process that ensures that

each daughter cell gets the necessary organelle

there is distribution of a complete set of genes into each daughter cell.

daughter cells inherit new genetic combinations.

worn out organelles are excluded from daughter cells

An animal which is active during the day is known as a

nocturnal animal

diurnal animal

terrestrial animal

homoatomic animal

Evidence of evolution include the following except

fossil records

comparative anatomy

mutation of genes

geographical distribution of organisms

The diagram shows that the organisms are

Use the diagram below to answer question 36 and 37

Hermaphrodite

viviparous

oviparous

ovoviparous

The breeding posture illustrated in the diagram is known as

mating

amplexus

courtship display

reproductive swimming

An accurate identification of a rapist can be carried out by it conducting a

RNA analysis

DNA analysis

blood group test

behavioural traits test

A boy who is fond of swimming in a pond finds himself passing urine with traces of blood. He is likely to have contracted

schistosomiasis

onchocerciasis

poliomyelitis

salmonellosis

The flippers of a whale and the fins of a fish are examples of

divergent evolution

coevolution

continuous variation

convergent evolution

1 out of 8

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