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Biology
WAEC / WASSCE 2009
Supporting Tissues & Skeletal System
The mesophyll layer of a leaf consists of
A
wax and cutin
B
cells with lignified walls
C
irregularly shaped collenchyma cells.
D
photosynthetic parenchyma cells.
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 #21447)
Biology
WAEC / WASSCE 2009
Transport System in Plants & Animals
Which of the following treatments would increase the rate of transpiration in a potted plant?
A
Placing it in a cold room
B
Placing it under a fan in a room
C
Putting it in a cupboard
D
Smearing grease on the lower surface of the leaves
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 #21448)
Biology
WAEC / WASSCE 2009
Digestive System & Feeding Mechanisms
Solution
Pepsin is secreted as an inactive precursor called pepsinogen because
A
pepsin as an enzyme is quickly destroyed by the alkaline food from the mouth
B
all digestive enzymes pass through a precursor stage
C
pepsin is a proteolytic enzyme and might attack the stomach tissues
D
pepsin is not required in large quantities
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
Pepsin is secreted as an inactive precursor, called pepsinogen to prevent it from digesting the cells and tissues that produce it.
By secreting pepsinogen, the stomach can control the activation of pepsin which usually occurs whenever pepsinogen comes in contact with Hydrochloric acid in the stomach. The acid environment triggers a conformational change in pepsinogen,allowing it to convert into pepsin.
This mechanism ensures that pepsin is only activated when it is needed. i.e Whenever food is ingested through the mouth and gets into the stomach, and helps protect the stomach lining and other tissues from damage.
Source: Myschool Past Questions Archive (Record #21449)
Biology
WAEC / WASSCE 2009
Nutrition in Plants & Animals (Photosynthesis & Food Substances)
An organism whose source of carbon is inorganic is likely to be a/an
A
heterotrophic organism
B
autotrophic organism
C
symbiotic organism
D
parasitic organism
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 #21450)
Biology
WAEC / WASSCE 2009
Transport System in Plants & Animals
Which of the following features is not characteristic of arteries? Arteries
A
possess valves at intervals throughout their length
B
have thick, muscular and elastic walls
C
carry blood away from the heart
D
transport oxygenated blood with the exception of the pulmonary artery
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 #21436)
Biology
WAEC / WASSCE 2009
Variety of Organisms & Classification of Living Things
Solution
A group of rats placed in an air-tight box for some hours died because they
A
breathed in air containing nitrogen.
B
produced carbon dioxide
C
ran short of energy
D
used up the available oxygen
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
Rats, like all mammals, require oxygen to survive. They breathe in oxygen and breathe out carbon dioxide, a process known as respiration. In an air-tight box, the available oxygen would eventually be used up, and the rats would die from lack of oxygen, not from the presence of carbon dioxide or nitrogen, or from running out of energy.
Source: Myschool Past Questions Archive (Record #21437)
Biology
WAEC / WASSCE 2009
Excretion & Homeostasis
Which of the following organisms have kidney as their excretory organ?
A
Fishes, amphibians, birds, man.
B
Fishes, amphibians, annelids, insects
C
Fishes, reptiles, birds, tapeworms
D
Fishes, protozoans, amphibians, man
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 #21438)
Biology
WAEC / WASSCE 2009
Adaptation & Evolution
Diagram
Solution
Which of the statements below is valid?
Attached Figure / Diagram
A
The bird’s blood was always warmer than that of the lizard
B
The body temperature of the bird varied less than that of the lizard during changes in environmental temperature
C
The body temperature of the bird remained constant despite changes in environmental temperature
D
The body temperature of the lizard was always close to that of the environmental temperature
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
From the graph of the body temperature of a lizard and a bird under artificial conditions. It can deduced that;
* Lizard
- It is a poikilothermic organism
- Its body temperature varies with the temperature of the environment
- The lizard needs to change to the environment temperature so that it can survive.
* Bird
- It is a homothermic organism
- Its body temperature is always constant to the environment
- The environment temperature those not affect the temperature of the body of the bird
Source: Myschool Past Questions Archive (Record #21439)
Biology
WAEC / WASSCE 2009
Adaptation & Evolution
Diagram
Solution
What physiological term can he used to
describe the regulation of the body
temperature of the lizard? '
Attached Figure / Diagram
A
Homeostasis
B
Homoithermy
C
Poikilothermy
D
Osmoregulation
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
Poikilothermy is the term used to describe organisms (like lizards and other reptiles) whose internal body temperature fluctuates and varies according to the temperature of their surrounding environment, as seen in the diagram(curve) above in the question. Lizards rely primarily on behavioural mechanisms, such as basking in the sun or seeking shade, to adjust their temperature.
Source: Myschool Past Questions Archive (Record #21440)
Biology
WAEC / WASSCE 2009
Nutrition in Plants & Animals (Photosynthesis & Food Substances)
Which of the following organisms is an endoparasite?
A
Mice
B
Mosquito
C
Ascaris
D
Dodder
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 #21451)
Biology
WAEC / WASSCE 2009
Basic Ecological Concepts, Ecosystems & Biomes
Which of the following statements about ecosystems is false?
A
All the energy entering the ecosystem is passed on to decomposers
B
The primary producers provide energy for herbivores and carnivores
C
Ecosystems must start with the capture of energy by autotrophs
D
Energy transfer from one trophic level to the other is not 100% efficient.
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 #21452)
Biology
WAEC / WASSCE 2009
Basic Ecological Concepts, Ecosystems & Biomes
What is the critical limiting factor for plants below the photic zone is an aquatic ecosystem?
A
Availability of nutrients
B
Availability of water
C
Intensity of light
D
Carbon dioxide concentration
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 #21453)
Biology
WAEC / WASSCE 2009
Basic Ecological Concepts, Ecosystems & Biomes
Which of the following instruments is used to estimate the number of plants in a habitat?
A
Pooter
B
Pitfall trap
C
Quadrat
D
Sweep net
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 #21454)
Biology
WAEC / WASSCE 2009
Basic Ecological Concepts, Ecosystems & Biomes
Which of the following statements is true about sandy soil? It
A
has limited air space
B
is light and easy to dig
C
drains slowly
D
is heavy and poorly aerated
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 #21456)
Biology
WAEC / WASSCE 2009
Basic Ecological Concepts, Ecosystems & Biomes
Which of the following organisms is a primary consumer?
A
Dog
B
Sheep
C
Grass
D
Fungus
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 #21457)