Below are the classification of crops based on their uses:

• Oil crops

• Vegetable crops

• Latex crops

• Drug and Medicinal crops

• Beverage crops

• Fibre crops

• Fruit crops

• Root and Tubers

• Legumes

• Spices

• Cereals

Agricultural Science

All crops are plants but not all plants are crops. Below are some instances:

• Weeds are considered as plants, not crops.

• Parasitic plants are not necessarily crops. Examples of parasitic plants include mistletoe, corpse flower and striga.

• Carnivorous or insectivorous plants are not necessarily crops. Examples are sundew, venus flytrap and pitcher plant. The image below shows a carnivorous plant (venus flytrap).

 

Meanwhile, always understand that all crops are plants, and they are grown for food, money or something beneficial.

Please read on plants versus crops here

Agricultural Science

Below are some of the problems of agriculture in Nigeria:

• Lack of mechanized farming

• Poor government policies

• High cost of fertilizers

• Lack of education

• Lack of storage facilities

• Bad road network

• Poor research facilities

Please read a detailed explanation on the problems of agriculture in Nigeria here.

Agricultural Science

The theory of international trade is guided by the principle of comparative cost. This principle was propounded by David Richards.

The principle of comparative cost states that a country should specialize in the production of goods and services in which they have a greater comparative advantage or the least comparative disadvantage.

Below is an instance on the principle of comparative cost.

Now, let us assume we have two countries producing and exporting rice and beans respectively.

• On a daily basis, If country A produces 100 grams of rice and 300 grams of beans daily and country B produces 50 grams of rice and 150 grams of beans, then according to this principle, country A has an advantage over country B with regards rice and beans production; but better still, country A has a greater comparative advantage in the production of beans.

 

From the above instance, it can also be said that country B is at a disadvantage with regards to the production of rice and beans. Infact, it has a bigger comparative disadvantage with regards to beans production.

The point to note here is this: A country utilizing the principle of comparative cost will always produce quality goods and services at a cheaper cost.

Commerce

No single country manufactures all the goods and services in our world. This implies that every country of the world relies on certain goods and services imported (or brought in) from other countries.

Foreign trade is defined as the exchange of goods, services and capital between two or more countries.

Foreign trade is also termed as international trade.

Please read more on foreign trade here

Commerce

Division of labour can be defined as the act of splitting job process into a number of different processes such that each process is done by a different person or group of persons.

Through the process of division of labour, one worker may constantly perform a specific aspect of the job and as a result, may become specialized in that area.

The result of specialization in the different department of a job will imply the production of goods with better quality.

Please read on division of labour here

Commerce

Wise men from the east came to visit the infant king. Upon their arrival, they saw the child with his mother Mary. They knelt down and worshiped the infant (Jesus).

Notice that the bible recorded that the wise men knelt down and worshipped the infant (Jesus), according to Matthew 2:11.

Only God can be worshiped. Jesus is always God, even as a baby.

It is important to state that Jesus remained God at every point in his physical existence, even when he was in the womb of the virgin; throughout his life on earth, death on the cross and eventual resurrection.

CRS

The wise men from the east opened their treasures and presented the infant Jesus with three significant gifts. These are gold, frankincense and myrrh.

• Gold represents a symbol of Jesus' kingship. Jesus is the King of kings, even at birth and throughout eternity.

• Frankincense represents a symbol of Jesus' divinity and a sign of worship. Only God can be worshipped; and as such, Jesus is fully God.

• Myrrh represents a symbol of Jesus' death. Jesus is truly man, and this is why he was able to suffer and die on the cross.

Please read on the early years of Jesus here.

CRS

Arrowhead lines are lines with pointed edges at one or both ends. The pointed edges are in the form of an arrow.

Arrowhead lines are used:

• At the end of dimensional lines.

• As measurement lines.

Please read more on types of line here.

Basic Technology

A thin continuous line could be a straight or curved line. However, the main point to remember is this: 'it is a tiny line with no dot or dashes within it'.

_______________________

A thin continuous line is used for representing the followings:

• Projection lines

• Hatching lines

• Construction lines

• Short center lines

• Measurement lines

• Diagonal lines used to state plane surfaces

• Intersections

• Leader lines

• Backside section lines

Basic Technology

The individual demand schedule is a table that shows the demand of a commodity that an individual (consumer) purchased at various prices, and at a particular time.

The table below shows an individual demand schedule:

Price in Naira (of a tuber of yam)	Quantity demanded (per week)
500	5
400	10
300	15
200	20
100	25

Economics

The market demand schedule is also referred to as an aggregate demand schedule, total demand schedule or composite demand schedule.

This is a table that shows the different commodities purchased by all the consumers or customers in the market.

The market demand schedule is the summation of the individual demand schedules, showing the demand of different customers for a commodity at a particular price. It is shown in the table below:

Unit price of commodity (Naira)	Quantity demanded by consumer A (QA)	Quantity demanded by consumer A (QB)	Market demand (QA +  QB)
50	20	15	35
40	40	30	70
30	60	45	105
20	80	60	140
10	100	75	175

 

From the above table, notice that when the unit price of the commodity was 50 Naira, consumer A demanded 20 quantities while consumer B demanded 15 quantities.

Please read more on demand schedule here.

Economics

Forms of division of labour relates the various ways through which division of labour may be carried out.

Take for instance, within a country, one state may choose to specialize in the production of a cars while another specializes in a different area, let's say agriculture.

Below are the forms of division of labour

• Complex division of labour

• Occupational division of labour

• Geographical division of labour

 

Please read more on the forms of division of labour here.

Commerce

The periodic table, also called periodic table of elements or Mendeleev's table, is a table that shows an organized arrangement of the 118 chemical elements according to their atomic number.

Out of the 118 elements; elements 1 - 94 are present in nature while elements 95 - 118 are synthesized artificially.

The manner at which elements are arranged on this table reveals some similarities in their electronic configurations and chemical properties.

Please read on the periodic table of elements here.

Chemistry

A compound composed of iron (Fe) and oxygen (O) was analyzed and found to contain 69.94% iron and 30.06% oxygen. Find the empirical formula of the compound. (Molar mass of Fe=55.85, O=16)

• Solution:

Step 1: Identify the given parameter from the question.

• Fe = 69.94%,   O = 30.06%.

• Empirical formula = Fe_?O_?

 

Step 2: Convert the percentages to gram. (just attribute grams to the %).

• 69.94% = 69.94g while 30.06% = 30.06g

 

Step 3: To get the mole ratio of each element, convert the gram to moles using the formula (mole = mass/molarmass). Please merorize this formula because we always work with moles in emperical formula.

• Mole of Fe: 69.94/55.85 = 1.252mol

• Mole of O: 30.06/16 = 1.879mol

 

Step 4: Divide both sides by the smallest mole ratio.

• Iron has the smallest mole ratio in our case, therefore: 1.252/1.252 = 1,    1.879/1.252 = 1.5

• We now have the formula = Fe₁O_1.5

 

Step 5: Multiply each of the moles by the smallest whole number that will convert each into a whole number. (In our case, the number '2' is the smallest whole number that will make '1.5' and '1' whole numbers when multiplied by it.

• For iron (Fe), we will have 1 x 2 = 2

• For oxygen (O), we will have 1.5 x 2 = 3

 

Step 6: Write the empirical formula.

• The empirical formula= Fe₂O₃

• Iron(III)tetraoxosulphate(VI)

Chemistry

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