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Biology
UTME / JAMB 2006
Excretion & Homeostasis
Solution
Mammals are capable of producing hypertonic urine mainly because of re-absorption in the
A
Bowmans capsule
B
Urethra
C
Ureter
D
Loop of henle
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
Hypertonic urine is highly concentrated urine with a higher solute concentration than water, formed to conserve water in the body, especially during dehydration.
Mammals are able to produce hypertonic urine due to the unique structure and function of the Loop of Henle in the kidneys:
- The Loop of Henle has a counter-current multiplier system that allows for the reabsorption of water and ions, concentrating the urine.
- The descending limb of the Loop of Henle is permeable to water, allowing water to be reabsorbed into the medulla.
- The ascending limb is impermeable to water, but actively reabsorbs ions, increasing the osmolarity of the medulla.
This process enables mammals to produce urine that is more concentrated than the blood, which is essential for conserving water.
The correct answer is D - Loop of Henle
The other options are not correct:
- Bowman's capsule (A) is the initial part of the nephron where filtration occurs, but it's not responsible for reabsorption.
- Urethra (B) is the tube that carries urine out of the body, not involved in urine concentration.
- Ureter (C) is the tube that carries urine from the kidneys to the bladder, also not involved in urine concentration.
Source: Myschool Past Questions Archive (Record #14838)
Biology
WAEC / WASSCE 2006
Nutrition in Plants & Animals (Photosynthesis & Food Substances)
The following life processes are common to both
plants and animals except
A
respiration
B
growth
C
reproduction
D
photosynthesis
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 #20819)
Biology
WAEC / WASSCE 2006
Cell Structure, Organization & Cell Division
Which of these organelles is common to both plant
and animal cells?
A
Chloroplast
B
Centriole
C
Mitochondrion
D
Pyrenoid
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 #20820)
Biology
WAEC / WASSCE 2006
Cell Structure, Organization & Cell Division
The epidermis of the mammalian skin is an example
of a tissue because the cells
A
prevent light from passing through them
B
have a similar structure and function
C
prevent excessive loss of water
D
are impregnated with keratin
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 #20821)
Biology
WAEC / WASSCE 2006
Variety of Organisms & Classification of Living Things
Which of the following statements is correct about
organs?
A
They are composed of specialized cells
B
They perform a certain overall function
C
They are not found in plants
D
Unicellular animals have few organs
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 #20822)
Biology
WAEC / WASSCE 2006
Variety of Organisms & Classification of Living Things
The structure used for movement in Amoeba is
A
cilia
B
pseudopodia
C
flagella
D
endoplasm
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 #20825)
Biology
WAEC / WASSCE 2006
Cell Structure, Organization & Cell Division
Solution
Which of the following parts of a cell is not an organelle?
A
Food vacuole
B
Mitochondrion
C
Cell wall
D
Nucleus
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
A cell wall is not considered a cell organelle, but rather a structural layer outside the cell membrane, providing support and protection.
Organelles are internal, membrane-bound structures within a cell that perform specific functions, like the nucleus or mitochondria. The cell wall, on the other hand, is a rigid outer layer that surrounds certain cells, including plant and fungal cells, and some bacteria.
Source: Myschool Past Questions Archive (Record #20826)
Biology
WAEC / WASSCE 2006
Cell Structure, Organization & Cell Division
The folded portion of mitochondrion is called
A
cristae
B
cell membrane
C
nucleolus
D
partition
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 #20827)
Biology
WAEC / WASSCE 2006
Cell & Its Environment (Diffusion, Osmosis & Transport)
The physical process which occurs when a red blood
cell is placed in distilled water causing it to burst and
break down is known as
A
crenation
B
plasmolysis
C
turgidity
D
haemolysis
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 #20828)
Biology
WAEC / WASSCE 2006
Cell & Its Environment (Diffusion, Osmosis & Transport)
During the process of osmosis a semi-permeable
membrane allows
A
only solute molecules to pass through it
B
both solute and solvent molecules to pass through it
C
only solvent molecules to pass through it
D
only gaseous molecules to pass through it
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 #20829)
Biology
WAEC / WASSCE 2006
Cell & Its Environment (Diffusion, Osmosis & Transport)
Which of the following environmental conditions is ideal
for plant cells to remain turgid?
A
Hot, dry weather
B
Windy weather
C
Cold, dry weather
D
Cool, humid weather
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 #20830)
Biology
WAEC / WASSCE 2006
Cell & Its Environment (Diffusion, Osmosis & Transport)
Solution
Which of the following processes does not contribute
towards growth?
A
Cell division
B
Cell enlargement
C
Cell differentiation
D
Cell plasmolysis
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
Plasmolysis refers to the shrinking of the cell's cytoplasm away from the cell wall due to loss of water, which does not promote growth. In contrast, cell division, enlargement, and differentiation are all processes that contribute to growth.
Source: Myschool Past Questions Archive (Record #20831)
Biology
WAEC / WASSCE 2006
Variety of Organisms & Classification of Living Things
The aspects of growth in living organisms include all
the following processes except
A
increase in dry weight
B
reversible increase in size
C
irreversible increase in length
D
increase in number of cells
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 #20832)
Biology
WAEC / WASSCE 2006
Cell & Its Environment (Diffusion, Osmosis & Transport)
Support in young herbaceous plants is provided by
A
translocation
B
guttation
C
turgidity
D
osmosis
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 #20834)
Biology
WAEC / WASSCE 2006
Transport System in Plants & Animals
Which of the following heart structures is best adapted
to cope with double circulation?
A
One auricle and one ventricle
B
Two auricles and one ventricle
C
Two auricles and partially divided ventricle
D
Two auricles and two ventricles
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 #20835)