Food web explained with examples

len Alfred Ajibola - Mon, 13th July, 2020 @ 11:43 AM

Topics in Biology

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Academic Questions in Biology

Please click here to see all Questions and Answers

In a food chain, the primary consumers are classified under trophic level  _____.

  • A. Zero

  • B. One

  • C. Two

  • D. Three

  • E. Four

  • F. Five

Cold blooded animals are referred to as _____.

  • A. Homeotherms

  • B. Endotherms

  • C. Poilokitherms

  • D. Ectotherms

  • E. Thermotherms

  • F. None of the above

All reptiles are vertebrates.

  • A. True

  • B. False

_____ cells are responsible for the formation of osteoblasts.

  • A. Osteocytes
  • B. Chondrocytes
  • C. Chondroblasts
  • D. Osteoclasts
  • E. Osteoprogenitor cells
  • F. Osteoblastic

_____ is a bone that constitute the axial skeleton.

  • A. Clavicle
  • B. Scapula
  • C. Patella
  • D. Radius
  • E. Sternum
  • F. Femur

Which of the following is false concerning cartilages and bones?

  • A. Cartilage does not have a direct blood supply while bones have direct blood supply
  • B. The process of ossification replaces a cartilage to bone
  • C. The protein that makes up cartilage is called chondrin while that that makes up bone is called ossein
  • D. Cartilage grows from both ends while bones grow from one of its epiphysis
  • E. They both have living cells within them
  • F. Haversian system is absent in cartilage but present in bones

A diagram showing the movement of energy through a food chain is called a _____.

  • A. Food Chain
  • B. Food Web
  • C. Food Energy
  • D. Food Link
  • E. Food Flow
  • F. Food Pyramid

Which of the following is NOT a part of the wrist bones (or carpal bones)?

  • A. Cuboid
  • B. Scaphoid
  • C. Hamate
  • D. Triquetral
  • E. Pisiform
  • F. Trapezium

Food Web

Food chain can be interlinked in a habitat, giving rise to food web. An understanding on the concept of food chain is vital towards comprehending a food web. This is true because a food web is simply a complicated food chain.

Recall that a food chain is a diagram that shows the feeding relationship between organisms (plants and animals) in a given habitat.

Please read more on food chain here

Please read on ecological concepts explained here

In order to properly explain what a food web really is, a diagram that shows its illustration is required. Below is a diagram that shows a food web.

Food Web - Len Academy

Using the above diagram as a point of reference, notice that the feeding pattern is interlinked. In fact, it is this interlinking of food chain that gives rise to a food web.

Consider the explanations below. The diagram serves as our reference.


  • Grasshopper feeds on berries.
  • The frog feeds on the grasshopper.
  • A snake feeds on the frog.
  • A titmouse feeds on the snake.
  • The fox eats the titmouse.

The aformentioned observations are illustrated below:

Berries >> Grasshopper >> Frog >> Snake >> Titmouse >> Fox

This illustration (above) is just one of the various food chains shown in the diagram. In this case, it is commenced by the berries, (called producers in a food chain). You will also observe from the diagram that another food chain in the same habitat is commenced by the plantain (also a producer).

Please read on autotrophic nutrition and photosynthesis here

Meanwhile, always remember that the producers will always commence a food chain while the decomposers ends it.

Notice that the food chain which commenced by the berries were directly consumed by the grasshopper, greenfly, butterfly and titmouse. These set of consumers are generally referred to as primary consumers as illustrated in explanation 2 below.

Food Web - Len Academy


Recall that the food chain in explanation 1 began with the berries which were consumed by the grasshopper, a primary consumer.

Notice that apart from the grasshopper feeding on berries, the greenfly, titmouse and butterfly also fed on the berries, thus initiating their respective food chain at the level of a primary consumer.

Once again, it is important to state that the interlinking of food chains will give rise to a food web. In this instance, the interlinking of the separate food chains initiated by the berries and plantains (at the level of the producers) gave rise to the food web as illustrated in the diagram. In addition, a separate food chain was also started at the level of the primary consumer by the butterfly, greenfly, grasshopper and titmouse since they all fed on the berries.

The instance below shows the food chain initiated by the greenfly at the level of a primary consumer:

  • Just like the grasshopper, the greenfly also feeds on the berries
  • The ladybird feeds on the greenfly.
  • Dragonfly feeds on the ladybird.
  • The frog feeds on the dragonfly.
  • The snake feeds on the frog.
  • The Buzzard eats the snake

Berries >> Greenfly >> Ladybird >> Dragonfly >> Frog >> Snake >> Buzzard.

The above instance is another food chain although it has some links with the first food chain (in explanation 1).

Note: It is this linking of food chains that gives rise to a food web.

You can attempt Len Academy questions and answers here

Food Web - Len Academy


  • Based on the fact that the grasshopper fed on the plantain and berries; while the frog fed on the grasshopper, then that's a simple food web in the diagram. This is true because it consists of two separate food chains linked together. The first food chain shows berries >> grasshopper >> frog while the second shows plantain >> grasshopper >> frog. Both food chains were initiated separately by the berries and plantain plants respectively (producers in this case) but ended with the same frog.
  • Also, you may have observed that apart from the dragonfly feeding on the ladybird, the titmouse also fed on the lady bird.
  • Also, the butterfly and titmouse fed on the berries along side the greenfly and grasshopper.
  • Similarly, the rabbit, mouse and grasshopper all fed on plantain.
  • Again, the buzzard and fox feeds on the mouse and rabbit. We can go on and on but the point to note is:

A food web shows multiple food chains or multiple feeding relationships or multiple feeding connections all linked together.

Understand that a food web always consist of more than one food chain (at least, a minimum of 2 food chains linked together).

You can read on the bones of the human skeleton here

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Amazing facts in Biology

Pufferfish - Len Academy

Pufferfish contain a toxin called tetrodotoxin. This makes them foul tasting and poisonous to predators. Tetrodotoxin is about 1,200 times more poisonous than cyanide, and there is enough toxin in one pufferfish to kill 30 adult humans. Unfortunately, there isn't any known antidote to this poison.

Interestingly, a delicacy in Japan (called fugu) is made from pufferfish. This meal is very expensive, and must be prepared by trained and licensed chefs. An improper preparation of fugu may lead to the customer's death. Sadly, such deaths are recorded annually

Wombat - Len Academy ​​​​​​

Wombats are the only animal with a cube-shaped poo. They can stack up these cube-shaped poo, marking their territory with it

Robert Waldow - Len Academy

Robert Wadlow (1918–1940) remains the tallest man ever recorded in the Guinness World Records. He was an American who stood at 8 feet, 11 inches.

An abnormally enlarged pituitary gland had resulted into Robert Wadlow's giant size.

Cockroach is the fastest land animal on six legs

Laughing ape - Len Academy

Like humans, all apes laugh when tickled

Ostrich eye and brain - Len Academy

An ostrich's eye is bigger than its brain

The upper front teeth are missing in giraffes. Meanwhile, like an adult human, a fully grown giraffe has 32 teeth but most are positioned at the back of their mouth

Slugs have four noses

Most insects hatch from egg but aphids give birth to their young alive

Bats aren't birds, rather, they are mammals. Infact, they are the second largest order of mammals after rodents. We have over 1,400 species of bat. Globally, they make up about 20% of all classified mammal species


For a thing to be considered living, it must possess all the basic characteristics of life. These include:

  1. Movement

  2. Respiration

  3. Nutrition

  4. Irritability or Sensitivity

  5. Growth

  6. Excretion

  7. Reproduction

  8. Death

  9. Adaptation

  10. Competition

Please read the explanations on all the basic characteristics of life here

During strenuous exercises like sprinting or running, your body may actually work in the shortage of oxygen. During this time, your body owes oxygen (called oxygen debt) and it must be replenished or repayed after the exercise is stopped. This is why you breathe excess of oxygen after you stopped the exercise.

This is the concept of anaerobic respiration

Food Chain - Len Academy

A food chain is a diagram that shows the relationship between plants and animals within a habitat on the basis of how they rely on each other for food.

Note: Habitat is a place where an organism live. It is of three types:

  • Terrestrial (Land)
  • Aquatic (Water)
  • Arboreal (Treetops)

You can read on food chain here

The term Biology originated from two Greek words. They are:

  • Bios: means life.

  • Logos: means knowledge or to study.

Biology can therefore be defined as the study of life

Anything that has life is generally considered as a living organism (or organism). All living organisms must be able to carry the following activities:

  1. Movement

  2. Respiration

  3. Nutrition

  4. Irritability or Sensitivity

  5. Growth

  6. Excretion

  7. Reproduction

  8. Death

  9. Adaptation

  10. Competition

The above listed points are often regarded as the basic characteristics of life. You can memorize them using the acronym -> MR. NIGER DAC.

You can read on the introduction to biology and the basic characteristics of life here

The gas used in the manufacture of food by plants is Carbon dioxide or Carbon(IV)oxide or CO2

Plants manufacture food through a process called photosynthesis.

Please read on photosynthesis here

It is noteworthy to state that plants are the only orgnisms that take away CO2 from the atmosphere