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Biology
WAEC / WASSCE 2000
Excretion & Homeostasis
Solution
In which of the following organisms is ammonia excreted as a waste product?
A
Man
B
Bird
C
Amoeba
D
Spirogyra
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
Ammonia is a waste product excreted by aquatic animals, as well as some other organisms, including Amoeba.
Amoeba's main waste products are ammonia and carbon dioxide. It excretes waste through diffusion, which is the movement of molecules from a higher concentration to a lower concentration.
Other organisms excrete nitrogenous wastes in different forms, including:
Birds and lizards: Excrete nitrogenous wastes as uric acid
Humans: Excrete urea
Reptiles and many terrestrial invertebrates: Produce uric acid
Source: Myschool Past Questions Archive (Record #19630)
Biology
WAEC / WASSCE 2000
Variety of Organisms & Classification of Living Things
Solution
The following are the functions of supporting tissues in plant except
A
rigidity
B
flexibility
C
strengthening
D
secretory
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
Supporting tissues in plants have several functions, including:
Structural support: Supporting tissues provide the framework and support the structure of the plant, holding up leaves, flowers, and buds.
Transportation: Supporting tissues transport water, nutrients, and assimilates throughout the plant.
Protection: The strength of supporting tissues protects the plant from enemies. For example, the hard shell of many seeds prevents animals from chewing them to pieces or puncturing them.
Flexibility: Supporting tissues give the plant flexibility and resilience, allowing it to bend without breaking.
Source: Myschool Past Questions Archive (Record #19631)
Biology
WAEC / WASSCE 2000
Variety of Organisms & Classification of Living Things
Solution
Which of the following organisms has the largest surface area-to-volume ratio?
A
Man
B
Earthworm
C
Amoeba
D
Grasshopper
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
Amoeba has the largest surface area-to-volume ratio among the organisms listed in the options. This is because amoeba is a unicellular organisms with a relatively large surface area compared to their volume.
As the size of an organism increases, its volume increases faster than its surface area. This means that the surface area to volume ratio decreases as the organism gets larger.
Source: Myschool Past Questions Archive (Record #19632)
Biology
WAEC / WASSCE 2000
Supporting Tissues & Skeletal System
Solution
Which of the following plant parts does not perform supportive function?
A
Parenchyma, xylem and . collenchyma
B
Epidermis, sclerenchyma and xylem
C
Parenchyma, collenchyma and sclerenchyma
D
Sclerenchyma, xylem and collenchyma
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
The supporting tissues in plants are collenchyma, sclerenchyma, and vascular tissues (xylem and phloem).
Parenchyma is one of the three main types of ground tissue in plants, along with collenchyma and sclerenchyma. Collenchyma is a living support tissue with irregular walls, while sclerenchyma is a dead support tissue with thick walls.
Source: Myschool Past Questions Archive (Record #19633)
Biology
WAEC / WASSCE 2000
Variety of Organisms & Classification of Living Things
Solution
The following are useful effect of micro-organisms except
A
production of vaccines
B
curing of tobacco
C
tanning of leather
D
decay of meat
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
Decay in meat is not a useful effect of microorganisms. Microorganisms can cause meat to spoil, which can lead to food waste and food borne infections. Spoilage can cause meat to change color, produce off-flavors, and develop mucus and exudates.
Source: Myschool Past Questions Archive (Record #19634)
Biology
WAEC / WASSCE 2000
Supporting Tissues & Skeletal System
Solution
Which of the following structures is not present in the vascular bundles of a dicot stem?
A
Xylem
B
Phloem
C
lntra-fascicular cambium
D
Inter-fascicular cambium
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
In each of vascular bundles in the dicot stem, xylem and phloem are on the same radius with xylem situated towards the pith and phloem situated towards the pericycle and a strip of cambium separates the two. This strip of cambium that separates the phloem and xylem is called interfascicular cambium. Therefore the only structure not present in the vascular bundle of a dicot stem is intrafascicular cambium. The correct answer is option C.
Source: Myschool Past Questions Archive (Record #19635)
Biology
WAEC / WASSCE 2000
Transport System in Plants & Animals
Which of the following conditions will cause a decrease in body temperature?
A
increased metabolism
B
Shivering
C
Vasoconstriction of capillaries of the skin
D
Relaxation of the erector muscles
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #19641)
Biology
WAEC / WASSCE 2000
Digestive System & Feeding Mechanisms
Solution
The organs constantly in touch with the liver are
A
pancreas, colon and caecum
B
duodenum and stomach
C
illeum, stomach and colon
D
stomach and gall bladder
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
The liver is the largest internal organ and is situated in the upper right-hand part of the abdominal cavity. Its visceral surface (the underside) is in direct, constant contact with several organs that leave impressions on it due to their proximity.
Stomach: The left lobe of the liver features a large "gastric impression" where it rests directly against the anterior surface of the stomach.
Gallbladder: This pear-shaped sac is physically attached to the visceral surface of the liver in a shallow depression called the gallbladder fossa. The liver also makes contact with the duodenum, right kidney, and the transverse colon (specifically the right colic flexure). However, the stomach and gallbladder are primary anatomical neighbors frequently cited in medical and biological contexts regarding liver impressions.
Source: Myschool Past Questions Archive (Record #19642)
Biology
WAEC / WASSCE 2000
Nervous, Hormonal Coordination & Sense Organs
Solution
Which of the following is responsible for the increased heart beat of a boy who saw a python? increased
production of
A
adrenalin
B
insulin
C
pituitrin
D
thyroxin
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Adrenaline is the hormone associated with fear and anxiety. it prepares the body for emergency and also increases heartbeat and respiration.
Source: Myschool Past Questions Archive (Record #19643)
Biology
WAEC / WASSCE 2000
Supporting Tissues & Skeletal System
The nerves that arise from the brain are known as
A
spinal nerves
B
sacral nerves
C
cranial nerves
D
optic nerves
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #19644)
Biology
WAEC / WASSCE 2000
Nervous, Hormonal Coordination & Sense Organs
The neurone that relay the message of effector organs are called
A
efferent neurones
B
intermediate neurones
C
afferent neurones
D
spinal nerves
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #19645)
Biology
WAEC / WASSCE 2000
Nervous, Hormonal Coordination & Sense Organs
Each neurone consists of the following structures' except
A
cell body
B
dendrites
C
axon
D
white matter
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #19646)
Biology
WAEC / WASSCE 2000
Nervous, Hormonal Coordination & Sense Organs
The simplest form of nervous pathway which links receptors with effectors is known as the
A
relay neuron
B
reflex arc
C
motor nerves
D
sensory nerves
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #19647)
Biology
WAEC / WASSCE 2000
Nervous, Hormonal Coordination & Sense Organs
Which of the following parts of the eye is sensitive to light?
A
Retina
B
Cornea
C
Choroid layer
D
Optic nerves
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #19648)
Biology
WAEC / WASSCE 2000
Reproduction in Plants & Animals
What happens to an ovule of a flower, after fertilization? It
A
becomes a fruit
B
withers away
C
becomes a seed
D
forms the cotyledons
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #19649)