Biology, 2021, JAMB Exam, Exam, Paper 1 | Objectives

Paper Info

Year :

2021

Title :

Biology

Exam :

JAMB Exam

Paper 1 | Objectives

11 - 20 of 40 Questions

#	Question	Ans
11.	In the mammalian respiratory system. exchange of gases occurs in the? A. lungs B. bronchi C. bronchioles D. alveoli Show Content Detailed Solution The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out. There is an explanation video available below.	D
12.	Aged erythrocytes are destroyed in the? A. pancreas B. liver C. lymph nodes D. kidney Show Content Detailed Solution Together with the spleen, the liver breaks down worn out red blood cells (erythrocytes) There is an explanation video available below.	B
13.	The villus in the small intestine is significant because it? A. increases the surface area for absorption B. increases the surface area for digestion C. assists in mixing digested food D. assists in filtering undigested food Show Content Detailed Solution The villi of the small intestine project into the intestinal cavity, greatly increasing the surface area for food absorption and adding digestive secretions. There is an explanation video available below.	A
14.	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 Show Content Detailed Solution 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. There is an explanation video available below.	A
15.	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 Show Content Detailed Solution 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. There is an explanation video available below.	C
16.	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 Show Content Detailed Solution 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,	D
17.	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 Show Content Detailed Solution 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. There is an explanation video available below.	B
18.	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 Show Content Detailed Solution 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. There is an explanation video available below.	B
19.	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 Show Content Detailed Solution The appendicular skeleton includes the bones of the shoulder girdle, the upper limbs, the pelvic girdle, and the lower limbs. There is an explanation video available below.	A
20.	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 Show Content Detailed Solution Aerenchyma is found in hydrophytes like water lily. This tissue encloses air and provides buoyancy to the plant parts There is an explanation video available below.	A

11.	In the mammalian respiratory system. exchange of gases occurs in the? A. lungs B. bronchi C. bronchioles D. alveoli Show Content Detailed Solution The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out. There is an explanation video available below.	D
12.	Aged erythrocytes are destroyed in the? A. pancreas B. liver C. lymph nodes D. kidney Show Content Detailed Solution Together with the spleen, the liver breaks down worn out red blood cells (erythrocytes) There is an explanation video available below.	B
13.	The villus in the small intestine is significant because it? A. increases the surface area for absorption B. increases the surface area for digestion C. assists in mixing digested food D. assists in filtering undigested food Show Content Detailed Solution The villi of the small intestine project into the intestinal cavity, greatly increasing the surface area for food absorption and adding digestive secretions. There is an explanation video available below.	A
14.	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 Show Content Detailed Solution 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. There is an explanation video available below.	A
15.	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 Show Content Detailed Solution 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. There is an explanation video available below.	C

16.	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 Show Content Detailed Solution 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,	D
17.	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 Show Content Detailed Solution 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. There is an explanation video available below.	B
18.	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 Show Content Detailed Solution 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. There is an explanation video available below.	B
19.	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 Show Content Detailed Solution The appendicular skeleton includes the bones of the shoulder girdle, the upper limbs, the pelvic girdle, and the lower limbs. There is an explanation video available below.	A
20.	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 Show Content Detailed Solution Aerenchyma is found in hydrophytes like water lily. This tissue encloses air and provides buoyancy to the plant parts There is an explanation video available below.	A