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Biology
WAEC / WASSCE 2020
Science of Living Things
Solution
Which of the following materials is not a living semi-permeable membrane?
A
pig's bladder
B
Unripe pawpaw fruit
C
Yam tuber
D
Sheet of cellophane
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
Semipermeable membrane is a type of biological or synthetic, polymeric membrane that will allow certain molecules or ions to pass through it by osmosis. There are two examples of semi-permeable membrane, which are non-living and living semi-permeable membrane. Examples of non-living semi-permeable membrane which are permeable to water but not solvent e.g copper sulphate solution are visking tube, parchment and cellophane.
Source: Myschool Past Questions Archive (Record #59455)
Biology
WAEC / WASSCE 2020
Science of Living Things
In an experiment, mould and yeast cells were transferred into an environment with low oxygen concentration. After a few days, the mould dies while the yeast cells did not. Which of the following statements best explains the following observation.
A
The yeast cells carried out photosynthesis while the mould did not
B
Photosynthesis does not take place in the absence of oxygen
C
Respiration can take place in yeast cells in the absence of oxygen
D
Respiration does not occur in the mould
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 #59471)
Biology
WAEC / WASSCE 2020
Science of Living Things
Solution
Which of the following tissues does not provide support in flowering plants?
A
Collenchyma
B
Parenchyma
C
Xylem
D
Phloem
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
The main supporting tissues in plants are parenchyma, collenchyma, sclerenchyma (fibre) and wood (xylem).
Source: Myschool Past Questions Archive (Record #59474)
Biology
WAEC / WASSCE 2020
Science of Living Things
Diagram
The diagram is an illustration of an experimental set-up. Study it and answer the question;
The set-up directly measure
Attached Figure / Diagram
A
transpiration of water by the shoot
B
evaporation of water from the leaves
C
absorption of water by the shoot
D
loss of mineral salts from the leaves
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 #59475)
Biology
WAEC / WASSCE 2020
Science of Living Things
Oxygen comes out of the stomata during photosynthesis through the process known as
A
diffusion
B
transpiration pull
C
osmosis
D
active transport
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 #59496)
Biology
WAEC / WASSCE 2020
Science of Living Things
The first stable product of photosynthesis is
A
starch
B
fructose
C
glucose
D
sucrose
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 #59497)
Biology
WAEC / WASSCE 2020
Science of Living Things
An example of a trace elements is
A
potassium
B
calcium
C
magnesium
D
copper
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 #59498)
Biology
WAEC / WASSCE 2020
Science of Living Things
Which of the following statements about a mixture of a protein-digesting enzyme and starch solution would be correct? The protein-digesting enzyme
A
has no effect on the starch solution
B
leads to the production of amino acids
C
leads to the production of glucose
D
digest the starch
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 #59500)
Biology
WAEC / WASSCE 2020
Science of Living Things
The mutualism type of relationship is different from a parasitic relationship because in mutualism
A
both organisms involved benefit
B
none of the organisms benefits or harm each other
C
both organisms harm each other
D
only one of the organisms is harmed
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 #59501)
Biology
WAEC / WASSCE 2020
Science of Living Things
Solution
The part of the central nervous system that controls unconscious actions in humans is the
A
cerebellum
B
cerebrum
C
spinal cord
D
optic nerves
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
The three primary roles of the spinal cord are to send motor commands from the brain to the body, send sensory information from the body to the brain, and coordinate reflexes.
Source: Myschool Past Questions Archive (Record #59491)
Biology
WAEC / WASSCE 2020
Science of Living Things
Solution
What happens when the ciliary muscles of the eye contract? The
A
lens become more concave
B
lens become more convex
C
lens gets a longer focal length
D
suspensory ligament becomes tight
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
When the ciliary muscles of the eye contract, the lens becomes more convex. This is because the contraction of the ciliary muscles reduces the tension on the suspensory ligaments holding the lens in place, allowing the lens to take on a more rounded (convex) shape. This increases the lens's refractive power, allowing for closer objects to be brought into focus.
Source: Myschool Past Questions Archive (Record #59492)
Biology
WAEC / WASSCE 2020
Science of Living Things
Diagram
Solution
The diagram is an illustration of a part of a flower. Study it and answer the question below;
The function of the part labeled I is
Attached Figure / Diagram
A
receiving the pollen grain
B
attract pollinators
C
germination of the pollen grain
D
site for double fertilization in the plant
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
Petals (collectively called the corolla) are also sterile floral parts that usually function as visually conspicuous elements serving to attract specific pollinators to the flower.
Source: Myschool Past Questions Archive (Record #59493)
Biology
WAEC / WASSCE 2020
Science of Living Things
The diagram below is an illustration of a part of a flower. Study it and answer the question below.
The part labeled II is the
A
unfused stigma
B
fused style
C
fused ovaries
D
unfused anther
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 #59494)
Biology
WAEC / WASSCE 2020
Science of Living Things
The reagent used in testing for carbon (IV) oxide is
A
copper sulphate solution
B
lime water
C
hydrochloric acid
D
sodium hydroxide solution
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 #59495)
Biology
WAEC / WASSCE 2020
Science of Living Things
The table below shows the number of some organisms in habitats W and Y. Study it to answer the question below;
Organism
Number in the habitat
habitat W
habitat Y
Plankton
126
0
Antelope
0
51
Water flea
10
0
Tilapia
23
0
Lion
0
6
Frog
6
0
Grass
0
250
What type of habitat is W?
A
Rainforest
B
Pond
C
Desert
D
Ocean
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 #59503)