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Biology
UTME / JAMB 2021
Nutrition in Plants & Animals (Photosynthesis & Food Substances)
Solution
Which of the following food substances will produce a brick-red colour when warmed with Benedict's solution?
A
Glucose
B
Starch
C
Egg White
D
Maltose
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
In lab, we used Benedict's reagent to test for one particular reducing sugar: glucose.
Benedict's reagent starts out aqua-blue. As it is heated in the presence of reducing sugars, it turns yellow to orange.
Source: Myschool Past Questions Archive (Record #60764)
Biology
UTME / JAMB 2021
Digestive System & Feeding Mechanisms
Solution
The blood vessel which carries blood from the alimentary canal to the liver is the?
A
hepatic artery
B
hepatic vein
C
hepatic portal vein
D
mesenteric artery
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
The portal vein or hepatic portal vein (HPV) is a blood vessel that carries blood from the gastrointestinal tract, gall bladder, pancreas, and spleen to the liver.
This blood contains nutrients and toxins extracted from digested contents.
Source: Myschool Past Questions Archive (Record #60765)
Biology
UTME / JAMB 2021
Nervous, Hormonal Coordination & Sense Organs
Solution
The correct sequence for the perception of smell in mammals is?
A
chemicals --> olfactory nerve endings --> brain
B
dissolved chemicals --> nasal sensory cells --> brain
C
chemicals --> mucus membrane sensory cells --> brain
D
dissolved chemicals --> sensory cells --> olfactory nerve --> brain
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
In mammals(humans), the process of olfaction begins when volatile molecules enter the nasal cavity and activate receptors in the olfactory epithelium (OE). The olfactory receptor (OR) proteins are located in hair-like projections of the olfactory sensory neurons (OSNs).
Source: Myschool Past Questions Archive (Record #60771)
Biology
UTME / JAMB 2021
Population Ecology, Habitats & Conservation
Solution
I. High birth rate and high immigration rate
II. Low birth rate and high immigration rate
III. Low mortality rate and low emigration rate
IV. High mortality rate and high emigration rate.
Which combination of the above can cause rapid over-crowding in climax biotic communities and human settlements?
A
II and III
B
I and III
C
I and IV
D
I and II
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
Low mortality rate, high birth rate, high immigration rate and low emigration rate are causes for rapid over-crowding.
Source: Myschool Past Questions Archive (Record #60772)
Biology
UTME / JAMB 2021
Variety of Organisms & Classification of Living Things
Solution
The number of plant species obtained from a population study of a garden is as follows: Guinea grass (15), Ipomoea spp (5), Sida spp (7) and Imperata spp (23)
What is the percentage of occurrence of Imperata spp?
A
35%
B
16%
C
46%
D
23%
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No of Imperata spp = 23
Total plant species = 50
Percentage of imperata spp = \(\frac{23}{50} * 100℅\)
= 46℅
Source: Myschool Past Questions Archive (Record #60773)
Biology
UTME / JAMB 2021
Population Ecology, Habitats & Conservation
Solution
When a marine fish was taken from the ocean and put in a tank of fresh water, it died after a short period because?
A
the tank was too small compared to the large-ocean
B
the body cells of the fish swelled and burst as a result of the hypotonic fresh water
C
the body cells of the fish shrank as their sap was hypertonic to the freshwater
D
there was no food in the tank, so the fish starved
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
Saltwater fish can't survive in freshwater because their bodies are highly concentrated of salt solution (too much for freshwater). The water would flow into their body until all their cells accumulate so much water that they bloat and die eventually.
Source: Myschool Past Questions Archive (Record #60909)
Biology
UTME / JAMB 2021
Variation & Genetics (Heredity)
Solution
If a DNA strand has a base sequence TCA, its complementary strand must be?
A
ATG
B
TAG
C
GAT
D
AGT
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
The complementary strand for TCA is AGT
A
T
G
C
T
A
C
G
A
T
T
A
G
C
A
T
Source: Myschool Past Questions Archive (Record #60912)
Biology
UTME / JAMB 2021
Cell Structure, Organization & Cell Division
Solution
Which of the following is TRUE of the process of conjugation in Paramecium?
A
Micronucleus disintegrates
B
Each ex-conjugant divides only once
C
Macro nucleus undergoes division
D
Each micronucleus divides twice
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
In Paramecium, Conjugation is a form of sexual reproduction. It is a temporary union of two individuals of same species for mutual exchange of genetic materials.
Through a process called conjugation, two paramecia line up side by side and then fuse together.
The two paramecium separate and go on their way in their watery environment.
They begin again to produce multiple copies of themselves through asexual fission.
During sexual reproduction, the micronuclei of each paramecium undergo meiosis, ultimately halving the genetic content to create a haploid nucleus.
These are exchanged between the two connected mates.
The haploid nuclei from each mate fuse to create a new, genetically varied, micronucleus.
Source: Myschool Past Questions Archive (Record #60766)
Biology
UTME / JAMB 2021
Variety of Organisms & Classification of Living Things
Solution
People who suck petrol with their mouths run the risk of increasing in their blood the concentration of
A
iron
B
lead
C
calcium
D
magnesium
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
It's discovered that tetraethyl lead (better known as lead) provided octane to gasoline, to fix knocking or pinging in engines that could damage them and waste gasoline.
Extremely high lead levels can lead to seizures, coma, and death.
Source: Myschool Past Questions Archive (Record #60767)
Biology
UTME / JAMB 2021
Growth, Micro-organisms & Public Health
Solution
Which of the following is a measure for the control of bilharzia?
A
Cutting low bushes around homes
B
Application of molluscicides in water bodies
C
Screening windows and doors with mosquito nets
D
Application of herbicides in water bodies
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
Schistosomiasis, also known as bilharzia or 'snail fever', is a disease caused by parasites (worms called schistosomes) carried by freshwater snails.
Schistosomiasis control focuses on reducing disease through periodic, large-scale population treatment with medication;
a more comprehensive approach including potable water, adequate sanitation, and snail control would also reduce transmission.
Source: Myschool Past Questions Archive (Record #60768)
Biology
UTME / JAMB 2021
Supporting Tissues & Skeletal System
Solution
The appendicular skeleton is composed of the pectoral girdle?
A
pelvic girdle, fore and hind limbs
B
pelvic girdle and fore limbs
C
lumbar vertebrae and pelvic girdle
D
lumbar vertebrae, fore and hind limbs
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
The appendicular skeleton includes the bones of the shoulder girdle, the upper limbs, the pelvic girdle, and the lower limbs.
Source: Myschool Past Questions Archive (Record #60769)
Biology
UTME / JAMB 2021
Population Ecology, Habitats & Conservation
Solution
A freshwater plant such as water lily can solve the problem of buoyancy by the possession of?
A
aerenchyma tissues
B
dissected leaves
C
thin cell walls of the epidermis
D
water-repelling epidermis
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Aerenchyma is found in hydrophytes like water lily.
This tissue encloses air and provides buoyancy to the plant parts
Source: Myschool Past Questions Archive (Record #60770)
Biology
UTME / JAMB 2021
Variety of Organisms & Classification of Living Things
Solution
The two key cations involved in the action potential of nervous transmissions are?
A
Na+ and Fe2+
B
Mg2+ and K+
C
Na+ and K+
D
Fe2+ and Mg2+
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
The Na⁺ / K⁺ - helps maintain resting potential, affects transport, and regulates cellular volume.
Source: Myschool Past Questions Archive (Record #60919)
Biology
UTME / JAMB 2021
Variety of Organisms & Classification of Living Things
Solution
I. Rattus rattus. Il. Agama agama III. Bufo regularis IV. Tilapia zillii
The order of evolutionary advancement of the above vertebrates is?
A
I, II, III, IV
B
I, IV, III, II
C
II, III, IV, I
D
IV, III, II, I
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
Evolutionary sequence in vertebrates: Fishes → Amphibians → Reptiles → Birds → Mammals.
IV → III → II → I
Source: Myschool Past Questions Archive (Record #60920)
Biology
UTME / JAMB 2021
Digestive System & Feeding Mechanisms
Solution
Which of the following produces both hormones and enzymes?
A
Ileum
B
Pancreas
C
Gall bladder
D
Kidney
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
The pancreas has two main functions: an exocrine function that helps in digestion and an endocrine function that regulates blood sugar.
Source: Myschool Past Questions Archive (Record #60923)