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Biology
UTME / JAMB 1997
Transport System in Plants & Animals
In mammals, the exchange of nutrients and metabolic products occurs in the
A
lymph
B
lungs
C
heart
D
liver
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 #5711)
Biology
UTME / JAMB 1997
Nutrition in Plants & Animals (Photosynthesis & Food Substances)
Diagram
Protein is synthesized in the part labelled
Attached Figure / Diagram
A
I
B
II
C
III
D
Iv
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 #5680)
Biology
UTME / JAMB 1997
Supporting Tissues & Skeletal System
Which of the following is the youngest plant tissue
A
Meristem
B
Phloem
C
Epidermis
D
Xylem
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 #5686)
Biology
UTME / JAMB 1997
Variety of Organisms & Classification of Living Things
Viruses differ from all forms of life because they
A
have thick cell wall
B
feed on waste products of other organisms
C
causes infectious diseases
D
require other living cells to multiply
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 #5688)
Biology
UTME / JAMB 1997
Variety of Organisms & Classification of Living Things
Solution
The endoplast cells found in hydra are used for
A
reproduction
B
offence and defence
C
locomotion and nutrition
D
food collection
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
The term "endoplast" in the context of many standardized biology exams is often used interchangeably with or as a misprint for
cnidoblasts(or nematocysts). These are specialized stinging cells located primarily on the tentacles of Hydra. Their primary functions include:
Offence: Paralyzing and capturing prey by releasing toxins.
Defence: Protecting the organism from predators.
Source: Myschool Past Questions Archive (Record #5693)
Biology
UTME / JAMB 1997
Variety of Organisms & Classification of Living Things
Annelides differ from nematodas in that they
A
exhibits bilateral symmentry
B
are triploblastic
C
are metamerically segmented
D
possess complete digestive system
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 #5698)
Biology
UTME / JAMB 1997
Cell & Its Environment (Diffusion, Osmosis & Transport)
Oozing out of water from the leaves of plants in a humid environment is known as
A
transpiration
B
osmosis
C
pinocytosis
D
guttation
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 #5727)
Biology
UTME / JAMB 1997
Variety of Organisms & Classification of Living Things
The element that is essential for the coagulation of blood is
A
potassium
B
calcium
C
phosphorus
D
iron
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 #5764)
Biology
UTME / JAMB 1997
Respiration & Gaseous Exchange
Solution
Anaerobic respiration differs from aerobic respiration by the production of
A
less amount of energy and water
B
greater amount of energy and alcohol
C
less amount of energy and alcohol
D
greater amount of energy and water
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
The correct answer is C. Less amount of energy and alcohol.
Anaerobic respiration occurs without oxygen (O₂), whereas aerobic respiration occurs with oxygen. The main differences between the two processes are:
- Energy yield: Anaerobic respiration produces less energy (2 ATP molecules) compared to aerobic respiration (36-38 ATP molecules).
- End products: Anaerobic respiration produces ethanol (alcohol) and carbon dioxide (CO₂) as end products, whereas aerobic respiration produces carbon dioxide and water.
The other options are not correct:
A. Anaerobic respiration produces less energy and alcohol, not water.
B. Anaerobic respiration produces less energy, not greater energy.
D. Anaerobic respiration produces alcohol, not water.
Source: Myschool Past Questions Archive (Record #5767)
Biology
UTME / JAMB 1997
Respiration & Gaseous Exchange
Solution
Stomatal pores open when there is
A
an increase in the sugar content of guard cells
B
a decreases in the osmotic concentration of the guard cell
C
a decrease in the sugar content of mesophyll cells
D
an increase in the sugar content of mesophyll cells
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
Stomatal pores do not open in response to an increase in sugar content, but rather, they close.- Option A is incorrect
Stomata pores close when there's a decrease in the osmotic concentration (solute concentration) of the guard cells, leading to water loss and shrinking of the guard cells.- Option B is incorrect
Stomatal pores typically do not open in response to a decrease in sugar content (specifically sucrose) in mesophyll cells; rather, they tend to close.- Option C is incorrect
An increase in sugar content (specifically, from mesophyll cells) in the guard cells can indeed lead to stomatal opening, as sugars act as osmolytes, drawing water into the guard cells and increasing their turgor pressure, which in turn causes the stomata to open.
Stomata are pores on the surface of leaves and other plant organs that allow for gas exchange (CO\(_2\) uptake for photosynthesis, and O\(_2\) release). Each stoma is surrounded by a pair of specialized cells called guard cells.
The opening and closing of the stomatal pore is controlled by the turgor pressure (water pressure) within the guard cells. When guard cells become turgid (swollen with water), they swell, causing the stomatal pore to open. Conversely, when guard cells become flaccid (lacking water), they shrink, closing the stomatal pore. Sugars, particularly those produced by photosynthesis in mesophyll cells, can act as osmolytes (solutes that affect water potential) in the guard cells.
How Sugars Influence Stomatal Opening:
When sugar levels increase in the guard cells, the sugar acts as an osmolyte, increasing the osmotic potential (or decreasing the water potential) within the guard cells.
This osmotic gradient causes water to move into the guard cells from surrounding cells, increasing turgor pressure.
The increased turgor pressure causes the guard cells to swell, pushing the stomatal pore open.
Source: Myschool Past Questions Archive (Record #5768)
Biology
UTME / JAMB 1997
Excretion & Homeostasis
Solution
The process of deamination is essential for the
A
digestion of protein
B
secretion of bile
C
formation of urea
D
formation of antibody
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
Deamination in the body is the process of removing the amino group (NH\(_2\)) from an amino acid, resulting in ammonia (NH\(_3\)) and a keto acid. This process is crucial for several reasons, including breaking down excess amino acids for energy, converting toxic ammonia to urea for excretion, and synthesizing other essential molecules.
Source: Myschool Past Questions Archive (Record #5769)
Biology
UTME / JAMB 1997
Digestive System & Feeding Mechanisms
the part of the stomach nearer the gullet is called th
A
epiglottis
B
cardiac spincter
C
duodenum
D
pyloric sphincter
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 #5712)
Biology
UTME / JAMB 1997
Nutrition in Plants & Animals (Photosynthesis & Food Substances)
Trace elements are required by plants mainly for the
A
formation of pigments and enzymes
B
production of energy and hormones
C
manufactured of carbohydrates
D
manufacture of proteins
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 #5715)
Biology
UTME / JAMB 1997
Variety of Organisms & Classification of Living Things
Diagram
Solution
The part that is similar to the bone is labelled
Attached Figure / Diagram
A
IV
B
III
C
II
D
I
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
The Dentin and Cementum of a human tooth are similar to bone. Dentin forms the main body of the tooth, extending from the crown to the root, and is a living, calcified tissue like bone. Cementum is a bone-like substance that covers the root of the tooth and anchors it to the jawbone.
The part labelled II is the dentin (See diagram above)
Source: Myschool Past Questions Archive (Record #5720)
Biology
UTME / JAMB 1997
Variety of Organisms & Classification of Living Things
Diagram
The part labelled I and II constitute the
Attached Figure / Diagram
A
Crown
B
neck
C
root
D
gum
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 #5723)