Agricultural Science

Asexual Propagation in Plants, Types and Examples

len Alfred Ajibola - Mon, 27th January, 2020 @ 12:25 PM

Topics in Agricultural Science

Types of agricultural practices Crop rotation explained Benefits of crop rotation Differences between subsistence and commercial farming Subsistence farming explained with its characteristics What is commercial farming? Types of commercial farming Characteristics of commercial farming Importance of forest: Forest reserves in Nigeria Wildlife reserves in Nigeria and its importance Prevention and Control of Crop Pests Economic Importance of Crop Pests Classification of Insect Pests and their Economic Importance Agricultural machines and their uses Causes of soil erosion Ways to prevent soil erosion Asexual Propagation in Plants, Types and Examples Differences between gymnosperms and angiosperms Scheme of Work, Agricultural Science, SS1, First Term Scheme of Work, Agricultural Science, SS1, Second Term Scheme of Work, Agricultural Science, SS1, Third Term

Academic Questions in Agricultural Science

Please click here to see all Questions and Answers

All plants are crops.

  • A. True

  • B. False

In agriculture, macronutrients are essential nutrients required by plants. Which of the following is not a macronutrient?

  • A. Zinc

  • B. Sulphur

  • C. Calcium

  • D. Phosphorus

  • E. Potassium

  • F. Magnesium

Which of the following is false concerning micronutrients?

  • A. They are non-essential nutrients

  • B. They are required by plants in minute quantities

  • C. Iron is a micronutrient

  • D. Chlorine is a micronutrient

  • E. Copper is a micronutrient

  • F. Boron is a micronutrient

_____ is a term that describes the biological, chemical and cultural control tactics employed to make pest management economical, environmentally friendly and socially acceptable.

  • A. Integrated Pest Management

  • B. Integral Pest Management

  • C. International Pest Management

  • D. Inclusive Pest Management

  • E. Imbibed Pest Management

  • F. Inclusion Pest Management

Cordage is made from _____ crop.

  • A. Food

  • B. Fibre

  • C. Ornamental

  • D. Oil

  • E. Cash

  • F. Vegetables and Spice

_____ is defined as the solid and arable part of the earth where agricultural activities are be carried out.

  • A. Soil

  • B. Farmland

  • C. Agricultural land

  • D. Biosphere

  • E. Open land

  • F. Planting and grazing land

Gymnosperms and angiosperms are seed bearing plants under the division spermatophyta?

  • A. True

  • B. False

Which of the following is false concerning gymnosperms?

  • A. Cones are present

  • B. Sepals are present

  • C. Petals are absent

  • D. Only seeds are produced

  • E. Sporophyll form the cones

  • F. In seed formation, the ovules aren't present in the ovary

Asexual Propagation in Plants:

Asexual propagation in plants is defined as the breeding of a specific plant specimen through natural processes by taking a vegetative part of the parent plant or stock.

Asexual Propagation is also referred to as vegetative propagation or asexual reproduction since a vegetative part of the plant (that is; root, stem, or leaf) is taken and made to regenerate itself into a new plant. The resulting plant that forms from this process is termed a clone of the parent plant.

A clone in this instance of asexual reproduction refers to a genetically identical offspring to it’s parent plant. For this reason, pollen grains and egg cells (which are associated with the plant's sexual reproduction) are not required in clone formation.

You can read on sexual propagation in plants here.

Clone formation is the best way to retain some plant species, especially the best of their kinds.

Types of Asexual Propagation

Various techniques are used to bring about vegetative propagation (or plants' asexual reproduction). They include:

1. Grafting

Grafting requires that a part of the parent plant is cut off and joined to another rooted plant so that they can grow as one plant.

The image below shows the the process of grafting:

Grafting - Len Academy

The term scion refers to the branch of the cut plant (desired variety) that will be grafted to the other rooted plant. Such rooted plant is called the stock. In this regard, grafting is done on a stock plant, with a very strong root system.

Please read on agricultural terms and their meanings here.

Grafting can be achieved through various methods: Some of these include:

  • Wedge Grafting

  • Cleft Grafting

  • Tongue Grafting

  • Bark Grafting

  • Butt Grafting

  • Side Grafting


2. Budding

Budding is a type of grafting. In fact, It is also called bud grafting.

The major difference between budding and grafting has to do with the shape on the stock on which the scion is inserted.

In budding, the part of the stock in which the scion is inserted is cut in a 'T shape'.

The image below shows an instance of budding:

Budding - Len Academy

The scion is inserted into the T shaped stock. The cut is then covered by winding a strip of polythene sheet, keeping only the bud exposed.

We have different types of budding. They include:


3. Cuttings

In cuttings, a part of the parent plant is severed (cut away) and planted. After some time, the severed part regenerates into a new plant. The image below shows this:

Cuttings - Len Academy

Cuttings are categorized into different types depending on the part of plant severed. They include:

  • Stem cuttings: The stem of a plant is severed and planted. For example mint and dahlia plants.
  • Root cuttings: The root of the plant is severed and planted. Examples are breadfruit and white poinsettia plants.
  • Leaf cuttings: A part of the plant's leaf is cut and planted. Examples are the african violets and kalanchoe plants.
  • You can Attempt Len Academy questions on agric science here.


4. Layering

This technique of vegetative propagation is similar to stem cuttings. The difference is summarized in the quote below:

In normal stem cuttings, the stem (not having roots) are cut away from the parent plant before it is planted.

In layering, the stem is first allowed to develop roots. These roots must be formed on the stem of the mother plant for layering to occur. Only after the formation of the root can we cut off the stem and plant it.

Below is an image showing the process of layering:

Layering - Len Academy

We have different types of layering. They are:


5. Separation

Separation applies to plant that produce corms and bulbs.

During separation, the new shoot (part of the plant above the root) is first detached (or separated) from the parent plant before it is planted. The bulbs of tulip and lily plants can be separated in this way.

The image below shows the process of separation:

Layering - Len Academy

Note: Certain bulbs may also produce smaller bulbs termed bulblets. The bulblets are always attached to the base of the parent bulb and can be easily separated in order to bring about vegetative propagation.

Please read on the differences between plants and crops here.

Another instance of separation is seen in cormels. The cormels refer to little or baby corms that attach to the parent corm, and these can also be separated for the purpose of vegetative propagation.


5. Division

Division is quite different from separation. In division, different parts of the plant (having buds) is divided into two or more parts (or sections). Each of the section is then planted to produce an independent plant.

Examples of plants the can be propagated via division are the rhizomes of iris and lily plants. Also, stem tubers like yams and potatoes with the presence of buds in various sections can also be propagated through division.

Below is an image of Kangaroo Paw Rhizome that had undergone division:

Layering - Len Academy

Division is generally used in asexual propagation when a cluster of plants are cut away into small units. When planted, the isolated units will grow into a parent plant.

You can Attempt Len Academy questions on agric science, JSS1 here.

Always understand that the process of division (in asexual propagation) does not occur naturally.

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Amazing facts in Agricultural Science

Cows technically have one stomach, not four. However, a cow's stomach has four compartments. These are: rumen, reticulum, omasum and abomasum

Peanuts are legumes and not nuts

Although plants neither see nor hear, they can recognize their siblings and even give them preferential treatments

Squirrels do plant more trees (through their actions) than an average human in their lifetime. They often hide their acorns and nuts underground and forget about them

Cows have got the ability to walk up stairs, but not down stairs

A group of cows is called a team, drove or herd.

People just prefer to call them herd

NOTABLE POINTS IN Agricultural Science

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

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).

Venus flytrap - Len Academy


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

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.

Secateurs are agricultural tools.

Secateurs - Len Academy

  • Secateurs are also referred to as pruning shears or hand pruners.

  • It looks like a pair of scissors.

  • It’s used for trimming flowers and leaves.

  • It is also used for pruning the branches of shrubs.

An example of an agricultural tool is the hoe. It is shown below:

Hoe - Len Academy

  • We have a variety of hoes.

  • They are generally used for tilling the soil.

  • They are used for making trenches in farmlands.

  • A hoe is utilized in harvesting crops like yam and cocoyam

  • They are also used for cutting weeds on farmlands.

Please read on agricultural tools and their uses here