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Transport Layer: Layer 4 of the OSI model - ICT Ecological pyramid explained with its importance and limitations - Biology Importance of immunization - Basic Science Postural defects that affect the spine or backbone - PHE Types of Carbohydrates: Monosaccharides and Polysaccharides - Basic Science Carbohydrates: Disaccharides and Oligosaccharides - Basic Science Importance of forest: Forest reserves in Nigeria - Agricultural Science Wildlife reserves in Nigeria and its importance - Agricultural Science Belt Drives: Types of belt drive - Basic Technology Cooperation in civic education - Civic Education Solutions to air pollution - PHE Business Structure: What is a business structure? - Business Studies Advantages and Disadvantages of franchise - Business Studies Why does suffering and pain exist? - CRS Angles: Type of angles based on degree measurement - Mathematics Angle Pairs: Types of angle pairs - Mathematics Arms of Government: Functions of the Executive, Legislature and Judiciary - Government Le Chatelier's Principle: Changes in concentration and pressure in dynamic equilibrium - Chemistry Chemical Equilibrium: Dynamic Equilibrium in Chemistry - Chemistry Static and Dynamic Equilibrium explained with their Differences - Chemistry Child marriage and its consequences - Social Studies Consequences of Female Genital Mutilation - Social Studies Forgiveness: Jesus' teaching on Forgiveness and its importance - CRS What is Forgiveness? Jesus' teaching on Forgiveness - CRS Advantages of Inflation - Economics Disadvantages of Inflation - Economics Concept of Inflation in Economics - Economics Hindbrain: Medulla Oblongata and its features - Biology Principle of Marketing: People as a Marketing Mix and their Importance - Commerce Len Academy Examination Questions for Basic Science, JSS2, 2nd Term - Basic Science Food web explained with examples - Biology Scheme of work for Economics, SS1, First Term - Economics Scheme of work for Economics, SS1, Second Term - Economics Scheme of Work for Economics, SS1, Third Term - Economics Branches of Geography: Physical and Environmental Geography - Geography Ceramics: Types of Ceramics - Basic Technology Advantages and Disadvantages of Chain drives - Basic Technology Len Academy Examination Questions for Basic Science, JSS3, 3rd Term - Basic Science Len Academy Examination Questions for Basic Science, JSS3, 2nd Term - Basic Science What is a franchise? Types of franchise - Business Studies What is Honesty? Who is a Dishonest Person? Consequences of Dishonesty - Civic Education What is Corporation? Types, Advantages and Disadvantages of Corporations - Business Studies Scheme of Work for Government, SS1, First Term - Government Scheme of Work for Government, SS1, Second Term - Government Scheme of Work for Government, SS1, Third Term - Government What is Limited Liability Company? Its Advantages and Disadvantages - Business Studies Partnership in Business: Types, Advantages and Disadvantages - Business Studies Principle of Marketing: Positioning as a Marketing Mix - Commerce Principle of Marketing: Packaging as a Marketing Mix - Commerce Chemistry Scheme of Work, SS1, First Term - Chemistry Chemistry Scheme of Work, SS1, Second Term - Chemistry Chemistry Scheme of Work, SS1, Third Term - Chemistry Literature in English Scheme of Work, SS1, 1st Term - Literature in English Literature in English Scheme of Work, SS1, 2nd Term - Literature in English Literature in English Scheme of Work, SS1, 3rd Term - Literature in English Characteristics of Double Entry System - Accounts Examples on the Principle of Double Entry System - Accounts Advantages and Limitations of the Double System in Accounting - Accounts Elements of Promotion in Marketing Mix - Commerce Principle of Marketing: Promotion as a Marketing Mix - Commerce Biology Scheme of Work, SS1, First Term - Biology Biology Scheme of Work, SS1, 2nd Term - Biology Biology Scheme of Work, SS1, 3rd Term - Biology Prevention and Control of Crop Pests - Agricultural Science Economic Importance of Crop Pests - Agricultural Science Phrase: Types of Phrase - English Len Academy Questions for Basic Technology JSS3, 2nd Term, 2020 - Basic Technology Len Academy Question for Basic Technology, JSS3, 2nd Term, 2020, Part 2 - Basic Technology Classification of Insect Pests and their Economic Importance - Agricultural Science Jesus' teaching on Giving - CRS Concept, Advantages and Disadvantages of Multi-Party System - Government Belt and Pulley Drives: Types of Belt in Belt Drives - Basic Technology Seminal Vesicles and Bulbourethral Glands as Male Accessory Sex Organs - Biology Principle of Marketing: Place as a Marketing Mix - Commerce Agricultural Machines and their Uses - Agricultural Science Clause and Types of Clause explained - English Derived Units: Similarities and Differences with Fundamental Units - Physics Concept, Advantages and Disadvantages of Two-Party System - Government Male Reproductive System: Scrotum and its contents - Biology Principle of Marketing: Price as a Marketing Mix - Commerce Principles of Marketing: The 7 Ps of Marketing Mix - Commerce Conversion of Number Bases explained with examples - Mathematics Soil Erosion: Causes of Soil Erosion - Agricultural Science Ways to prevent Soil Erosion - Agricultural Science Essay: How to write the major types of essay - English Healthy Self-esteem: Characteristics and Benefits of Healthy Self-esteem - Social Studies Causes of Environmental Problems - Social Studies Effects of Environmental Problems and Solutions to Environmental Problems - Social Studies Compounds in Chemistry: Characteristics of Compounds - Chemistry Types of Mixture: Homogenous and Heterogeneous Mixtures - Chemistry Mixtures: Characteristics of Mixtures - Chemistry Functions of the Wholesaler - Economics Advantages and Disadvantages of the Wholesaler - Economics Wholesale Market: Who is a Wholesaler? - Economics Characteristics of the Wholesaler - Economics Brain: Introduction to the Human Brain - Biology Forebrain: Lobes of the Cerebrum and their Functions - Biology Cerebellum: Parts and Functions of the Cerebellum - Biology Midbrain: Division and Functions of the Midbrain - Biology Negative Feedback Mechanism in Homeostasis - Biology Factors necessary for Division of Labour - Commerce Disadvantages of Division of Labour - Commerce Advantages of Division of Labour - Commerce Arterial Disorders: Characteristics and Causes of Arterial Disorders - Biology Consequences of Drug Trafficking and Solutions to Drug Trafficking - Social Studies Drug Trafficking: Reasons for Drug Trafficking - Social Studies Gravity: Interesting facts on Gravity - Physics Asexual Propagation in Plants, Types and Examples - Agricultural Science Differences between Gymnosperms and Angiosperms - Agricultural Science Relative Density of Substances and Specific Gravity - Physics Retail Market: Who is a Retailer and Examples of Retailers - Economics Market: Types of Market - Economics Market - What is a Market in Economics? - Economics Self-esteem: How to overcome Low Self-esteem - Social Studies What is Low Self-esteem? Characteristics of Low Self-esteem - Social Studies Low Self-esteem: Causes of Low Self-esteem - Social Studies Physical Properties of Matter explained with Examples - Chemistry Chemical Properties of Matter explained with Examples - Chemistry Differences between Physical and Chemical Change - Chemistry Outbound Marketing explained - Commerce


Factorize 12a2 - 20a + 3

  • A. (6a - 1)(2a - 3)

  • B. (6a - 1)(2a + 3)

  • C. (6a + 1)(2a - 3)

  • D. (6a + 1)(2a + 3)

  • E. (-6a + 1)(2a - 3)

  • F. (-6a + 1)(2a + 3)

Mathematics

ANSWER: (6a - 1)(2a - 3)

To factorize the above equation, we will need to split the middle value into 2 numbers whose:

  • Addition or Subtraction will be equal to -20a

  • Product will be equal to 36a² (that is, the product of 12a2 and 3 (at the right side).

-18a – 2a will work for us because:

  • Their subtraction = -20a

  • Their multiplication = 36a²

12a2 – 18a – 2a + 3

Notice that 12a2 and 18a are divisible by '6a' (That is, 6a is a factor) while 2 and 3 are not divisible. Therefore we can write:

6a(2a - 3) -1(2a - 3)

Now the brackets are the same, so our answer is:

Answer = (6a - 1)(2a - 3)

Please read on factorization here

Simplify 10ab + 7ab

  • A. 17ab2

  • B. 17a2b2

  • C. 3ab2

  • D. 3a2b2

  • E. 17ab

  • F 3ab

Mathematics

ANSWER: 17ab

From the question, since 10ab and 7ab possess the same coefficients, that is: (+10 and +7); we will simply add both coefficients in order to get our answer.

(10 + 7)ab = 17ab

You can read on the concept of algebra here

Which of the following statement is false concerning hydrocarbons?

  • A. Hydrocarbons can be aromatic

  • B. Hydrocarbons are made up of carbon and hydrogen only

  • C. Alkynes are aliphatic hydrocarbons

  • D. Alkenes have a carbon-carbon double bond in their structure

  • E. Benzene ring has a carbon-carbon triple bond in its structure

  • F. Hydrocarbons are the main constituents of petroleum and natural gas

Chemistry

ANSWER: Benzene ring has a carbon-carbon triple bond in its structure

Benzene is an aromatic hydrocarbon. It has a carbon-carbon double bond in its structure. See the image below.

Benzene ring Len Academy

Please read more on hydrocarbons here.

The ability of carbon to form long chain of itself is called _____.

  • A. Carbon chain reaction

  • B. Catenation

  • C. Carbontion

  • D. Carbontion

  • E. Organic chemistry

  • F. Carbon moleculation

Chemistry

ANSWER: Catenation

Carbon is the focus of organic chemistry. This is true because it can form long chain of itself and this process is called catenation.

Understand that organic chemistry is the study of carbon and its compounds. Carbon is the focus because of its ability to catenate.

Please read on an introduction to organic chemistry here.

Cold blooded animals are referred to as _____.

  • A. Homeotherms

  • B. Endotherms

  • C. Poilokitherms

  • D. Ectotherms

  • E. Thermotherms

  • F. None of the above

Biology

ANSWER: Ectotherms

Cold blooded animals are also referred to as ectotherms or poikilotherms or poikilothermic animals because they depend on their external environment towards regulating their bodily temperature. Fishes, amphibians and reptiles are all ectotherms.

Please read more on the characteristics of reptiles here.

Conversely, humans are endotherms or homeothermic animals because their temperature is regulated internally via a process termed homeostasis.

Please read more on homeostasis here.

All reptiles are vertebrates.

  • A. True

  • B. False

Biology

ANSWER: True

All reptiles are vertebrates and this is one of their main characteristics.

Vertebrates are animals with backbone or vertebral column.

Please read more on reptiles and their characteristics here.

An 🍎 apple 🍎 falling from a tree has an unbalanced force.

  • A. True

  • B. False

Physics

ANSWER: True

An apple falling from a tree has an unbalanced force. Think of it this way:

When forces from different directions act on an object and consequently bring about the object's movement, then such forces are unbalanced. If the forces were to be balanced, then the object will remain in a static position.

Please read more on force and motion here

Force is a quantity measured in _____.

  • A. Kilogram

  • B. Gravity

  • C. Incandescence

  • D. Meter per second square (ms-1)

  • E. Mole

  • F. Newton

Physics

ANSWER: Newton

Force is a quantity measured in Newton. This is in honor of Sir Isaac Newton for the great work he had done on motion and force. 

Please read more on the concept of force and motion here

Heat transfer indicates two systems of varying temperatures and will always be transferred from a region with lower temperature to another with higher temperature.

  • A. True

  • B. False

Physics

ANSWER: False

Heat transfer indicates two systems of varying temperatures and will always be transferred from a region with higher temperature to another with lower temperature.

Understand that heat is always transferred from a higher temperature region to a lower temperature region.

To better understand the processes of heat transfer, a knowledge on the movement of particles (in matter) is required.

Please read more on heat transfer and particle movements in matter here

Democracy is defined as a government formed by the consent of the governed.

  • A. True

  • B. False

Government

ANSWER: True

Democracy is a form of government that gives power to the people. It has been defined in various ways:

Democracy is defined as a government by the people in whom ultimate and supreme power lies; and is exercised through their votes in a free and fair electoral system.

Democracy is also defined as a government formed by the consent of the governed.

Democracy has popularly been defined as government of the people, by the people and for the people.

Please read more on democracy here

Which of the following is not a type of democracy?

  • A. Peripheral democracy

  • B. Direct democracy

  • C. Islamic democracy

  • D. Representative democracy

  • E. Participatory democracy

  • F. Authoritarian democracy

Government

ANSWER: Peripheral democracy

Peripheral Democracy is not a type of democracy.

Democracy is a system or form of government that focuses more on the people (citizens) of a nation or state. It occurs in different types and can be practiced in different forms.

Please read on the types or forms of democracy here

Which of the following factors can lead to drug addiction?

  • A. Inspiration

  • B. Relaxation purposes

  • C. Curiosity

  • D. Discrimination

  • E. Revenge

  • F. All of the above

PHE

ANSWER: All of the above

The above options will all to drug addiction. Similarly, they will also lead to drug abuse.

Please read more on explanations on the factors the leads to drug abuse

Drug addiction is defined as the habitual taking of drugs for different purposes.

  • A. True

  • B. False

PHE

ANSWER: False

Drug addiction and drug abuse aren't the same thing.

Drug addiction is defined as a process whereby a person cannot function properly without the use of a specific drug.

On the contrary, Drug abuse is defined as the habitual taking of drugs for different purposes.

Please read more on drug abuse here

Which of the following statement is incorrect regarding community service?

  • A. It is synonymous to volunteer service

  • B. It is defined as a service performed by an individual or group of people for the benefit of the community or its institutions without any form of payment

  • C. It can be done in any part of the world

  • D. Schools, churches and NGOs can carry out community service

  • E. Participating in community service can improve one's curriculum vitae

  • F. It may eradicate certain vectors wherever it is done

Civic Education

ANSWER: It is synonymous to volunteer service

Community service isn't the same thing as volunteer service (although both may be related)

  • Community service is defined as a service performed by an individual or group of people for the benefit of the community or its institutions without any form of payment.

Conversely, volunteer service is done out of one's own will, unlike community service which can be forced upon a person; for instance, an inmate or a traffic offender.

Please read more on community and volunteer service here

Which of the following is an example of oil crop?

  • A. Melon

  • B. Rubber

  • C. Flax

  • D. Moringa

  • E. Ginger

  • F. Coffee

Agricultural Science

ANSWER: Melon

Oil crops re grown for the purpose of their oil which they produce when processed. Examples are oil palm, groundnut, coconut and melon.

Please read more on classification of crops here (plants vs crops)

Concerning crops and plants, which of the following statement is incorrect?

  • A. All plants are not crops

  • B. All crops are plants

  • C. Cactus can be a crop

  • D. Corpse flower is not a plant

  • E. Venus flytrap is not a crop

  • F. All the options are correct

Agricultural Science

ANSWER: Corpse flower is not a plant

A crop is any plant used by humans for the purpose of food, money or something beneficial.

Corpse flower is a plant (a parasitic plant), although it's not a crop. It is shown below:

Corpse flower - Len Academy

Please read more on plants vs crops here

Which of the following is not a problem associated with agriculture?

  • A. Superfluous research facilities

  • B. Poor road network

  • C. Illiteracy

  • D. Lack of storage facilities

  • E. Limited mechanized farming

  • F. Bad government policies

Agricultural Science

ANSWER: Superfluous research facilities

Superfluous means excess. The presence of numerous agricultural research centres (agricultural extensions) will facilitate agricultural development through new innovations and agricultural education.

You can read on problems of agriculture in Nigeria here

Concerning the game of basketball, which of the following is incorrect?

  • A. Only 5 players for each team are allowed to play the game inside the court at any given point in time

  • B. The maximum players each team can have is 12

  • C. Teams can be awarded 1, 2 or 3 point depending on where and how a goal is scored

  • D. The game is played for a duration of 4 periods

  • E. Each game period has a time duration of 8 minutes

  • F. A team in possession of the ball has 24 seconds in an attempt to score or to have a shot towards the basket

PHE

ANSWER: Each game period has a time duration of 8 minutes

The game is played for a duration of 4 periods with each having a time duration of 10 minutes.

Please read more on the rules of basketball here

Which of the following sport personnel is incorrectly matched to his field.

  • A. Isreal Adesanya - UFC

  • B. Michael Phelps II - Volleyball

  • C. Lewis Hamilton - Formula one

  • D. Tiger Woods - Golf

  • E. Mohammed Ali - Boxing

  • F. LeBron James - Basketball

PHE

ANSWER: Michael Phelps II

Michael Fred Phelps II is a American  swimmer. He is the most decorated olympian of all time with a total of 28 medals. He also holds the all-time records for olympic gold medals, olympic gold medals in individual events, and olympic medals in individual events.

Michael Phelps - Len Academy

You can read on careers in physical and health education here

Which of the following is not a career in physical and health education?

  • A. Sports manager

  • B. Food distributor

  • C. Physical therapist

  • D. Gym trainer

  • E. Professional wrestler

  • F. Golfer

PHE

ANSWER: Food distributor

A food distributor is a basically a trader.

A career in physical and health education will relate typically to sports and certain health institutions.

Please read more on careers in physical and health education here

Calculate the relative molecular mass of methane. (Carbon = 12.001, H = 1.00794).

  • A. 13.00894 amu

  • B. 11.00206 amu

  • C. 12.00794 amu

  • D. 14.001 amu

  • E. 15.001 amu

  • F. 16.033 amu

Chemistry

ANSWER: 16.033 amu

To answer the question correctly, you need to know the chemical formula for methane which is CH4.

With this knowledge, we can correctly add the values in accordance to their mole(s). That is: 

  • 12.001 + (1.00794 x 4)

  • 16.033 amu

Note: amu stands for Atomic Mass Unit. Dalton (Da) is also a unit for relative molecular mass

Please read more on relative molecular mass here

Which of he following is not a fact concerning gold?

  • A. 24 karat gold is the purest gold element

  • B. It is the 50th rarest metal amongst all elements found beneath the earth crust

  • C. It is the most malleable and ductile pure metal ever known

  • D. It is the only metal with a golden color

  • E. Gold is non toxic and can be eaten with food

  • F. It's present inside the earth crust in all seven continents

Chemistry

ANSWER: It is the 50th rarest metal amongst all elements found beneath the earth crust

Gold is the 58th rarest metal amongst all elements found beneath the earth crust.

Please read more facts on gold here

According to the principles of the dual entry system, an increase in asset is credited.

  • A. True

  • B. False

Accounts

ANSWER: False

An increase in asset is always recorded in the debit side of a dual or double entry system of accounting.

As an instance, when person purchases a phone, he or she has a new asset and that's the phone. If he/she were to make a double system entry, the phone (new asset) will be recorded on the debit side while the money spent (decreased asset) will be recorded on the credit side.

You can read on examples of the double entry system here

The followings are true on the double entry system of accounting except _____.

  • A. Errors can't be made

  • B. It can be time consuming

  • C. It can be used as an accounting reference

  • D. It can be used to control a company's expenditure

  • E. There is completion of account transaction

  • F. It isn't difficult to implement

Accounts

ANSWER: Errors can't be made

The double system of accounting is one that shows recorded transactions at both sides (debit and credit side respectively) of the entries with both having equal values. Errors can be made when such transaction entries are made. (This is true because we are humans).

Note: No one is above mistake.

Please read more on the advantages and limitations of the double entry system

With regards to ozone, which of the following is incorrect?

  • A. Ozone is a triatomic molecule

  • B. Ozone layer aids in preventing excess ultraviolet radiation from reaching the earth

  • C. Ozone is a natural greenhouses gas

  • D. Ozone comprises of oxygen molecules only

  • E. Ozone layer brings about a global warming on earth

  • F. Ozone is present in the stratosphere

Geography

ANSWER: Ozone layer brings about a global warming on earth

Ozone is a natural greenhouse gas and thus does not bring about global warming on earth. Conversely, man-made greenhouse gases in their excesses results into earth's global warming.

Examples of man-made greenhouse gases include methane and carbon(IV)oxide.

Please read more on the functions of the atmosphere here

With regards to ozone, which of the following is incorrect?

  • A. Ozone is a triatomic molecule

  • B. Ozone layer aids in preventing excess ultraviolet radiation from reaching the earth

  • C. Ozone is a natural greenhouses gas

  • D. Ozone comprises of oxygen molecules only

  • E. Ozone layer brings about a global warming on earth

  • F. Ozone is present in the stratosphere

Geography

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Quotes for Students

The first problem for all of us, men and women, is not to learn, but to unlearn - Gloria Steinem

The act of unlearning is an excellent form of learning. Infact, you will need the skills of unlearning if you intend to become an expert in your desired field.

Do yourself a favor by unlearning, learning and re-learning on a daily basis

If you don't design your own life plan, chances are you'll fall into someone else's plan. And guess what they have planned for you? Not much - Jim Rohn

There's something special about you. It doesn't matter whether you work for a company or someone; what matters is the amount of investment you've made on yourself.

Investing in yourself is the best life plan you can design for your future

Smile - Len Academy

Peace begins with a smile - Mother Teresa

Never underestimate the power of your smile. It can lift up the depressed, improve the mood of the downtrodden and even discourage a suicidal attack. Also remember that your smile makes you more beautiful

Smile always for your own good and the good of others

The only person who is educated is the one who has learned how to learn …and change - Carl Rogers

To perfect your learning process, you must learn, unlearn and re-learn. Infact, we all need to learn how to unlearn those vices we know about ourselves.

Do you know that seeing the devastating consequences of vices (perhaps in movies or real-life) can initiate the unlearning processes in one who does such?


Key Points for Students

God created human beings for the following reasons:

  1. To know Him

  2. To love Him

  3. To serve Him

  4. To be happy with Him forever

Our first parent, Adam and Eve enjoyed a life of complete happiness before they committed sin. They never knew what pain nor sorrow was until they disobeyed God. In short, both were perfect beings until they committed the sin of disobedience against God.

Disobedience may simple be defined as the failure to obey rules, command or someone in authority.

Adam and Eve were the first human beings to disobey God.

Please read more on the biblical account of first human disobedience here

CRS

Adam and Eve were able to commit sin (disobey God's command) because God had given them that special gift of free will.

The events written in Genesis 3:1-13 presents the story of the first human disobedience.

Now the snake was the most cunning animal that the Lord God had made. The snake asked the woman, 'Did God really tell you not to eat fruit from any tree in the garden?'

Genesis 3:1

Moral Lesson: The devil can come in any form and can tempt any man, woman, boy or girl, as far as he or she is of the age of reasoning.

Sometimes, satan creeps into one's life by asking simple questions. Notice that the snake (satan) did exactly this when it approached Eve to tempt her. To this end, we need to be at alert prayerfully because the evil one can tempt any human in any situation, place and at any point in time

CRS