Biology

Types of desert and their characteristics

len Alfred Ajibola - Fri, 10th January, 2020 @ 3:25 PM

Topics in Biology

Tropical savanna explained with its characteristics Ecological pyramid explained with its importance and limitations Hindbrain: Medulla Oblongata and its features Food web explained with examples Biology Scheme of Work, SS1, First Term Biology Scheme of Work, SS1, 2nd Term Biology Scheme of Work, SS1, 3rd Term Male accessory sex organs: Seminal vesicles and bulbourethral glands Scrotum and its contents: Testicles Brain: Introduction to the human brain Forebrain: Lobes of the cerebrum and their functions Cerebellum: Parts and functions of the cerebellum Midbrain: Division and functions of the midbrain Negative feedback mechanism in homeostasis Arterial disorders explained with their causes Types of desert and their characteristics Characteristics of tropical rainforest Swamp forest: What are swamp forests? Characteristics of swamp forests Savanna biome: Concept of the savanna


Academic Questions in Biology

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

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Cold blooded animals are referred to as _____.

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All reptiles are vertebrates.

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_____ cells are responsible for the formation of osteoblasts.

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_____ is a bone that constitute the axial skeleton.

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Which of the following is false concerning cartilages and bones?

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Types of deserts:

Deserts are generally classified into 2 types. These are:

  1. Hot deserts

  2. Cold deserts


With regards to the hotness or coldness of a desert, we can further classify them into 4 types. These are:

  1. Subtropical deserts

  2. Coastal deserts

  3. Cold winter or semi-arid deserts

  4. Polar deserts

Please read on the introduction to deserts here.

Below are explanations on the aformentioned types of desert.


  • Hot Deserts

Hot deserts are located on the western coast of continents within latitudes 15o north and 30o south of the equator.

The subtropical deserts are categorized as hot deserts. In short, they are the hottest deserts in the world. (Subtropical deserts will be explained in the latter part of this article).

Note: Xerophytes are defined as drought resistant plants. They are found in hot deserts are able to survive through special adaptive features found on them. Examples of xerophytes are cactus, wiring grasses, thorn bushes and acacia.

You can read on the savanna here.


Characteristics of hot deserts

Hot deserts show the following characteristics or features:

  1. They have a very low annual rainfall of about 250mm.
  2. The vegetation found in hot desert is sparse and scanty.
  3. The land is dry or arid.
    Please read on temperate savanna here.
  4. Cold currents are very common here; especially during the winter periods.
  5. The few vegetations that may be present will include grasses, herbaceous plants and shrubs.
    Please read on the differences between plants and crops here.
  6. Its relative humidity is very low.
  7. The plants found here have special adaptive features and are generally referred to as xerophytes.

You can read on ecology and branches of ecology here.

 

  • Cold Desert

Cold deserts are found in the interior of continents around 45o north and 60o south of the equator.

The cold winter deserts and polar deserts are classified as cold deserts. (Both will be explained in the latter part of this article).

It is worthy of note to state that cold deserts may not remain cold throughout the year. However, during the winter periods, they show extreme coldness in their temperatures. They can also act as a functioning ecosystem for organisms like the polar bear and fishes.

Please read more on ecosystem here.


Characteristics of cold deserts

  1. They can have hot summers of over 35oC and cold winters with a temperature below 8oC.
  2. The annual rainfall is very little.
  3. The grasses found in cold deserts are short and scanty.
  4. Xerophytes are present in cold deserts. They have a characteristic needle like leaves which functions to reduce the rate of transpiration.

    Transpiration in plants is defined as a process through which water is lost from the aerial parts of a plant; especially through the stomata present in the plant's leaf.

    Water may also be lost from the plant's stem and flowers during transpiration.

    Please read on the differences between gymnosperms and angiosperms here.

  5. The regions where cold deserts are found include the Patagonia in South America, the interiors of Eurasia and in North America.

Please read on the concept of a biome here.

 

  • Subtropical Desert

They are the hottest deserts in our world. They are very hot and dry in the summer but can be a little cooler during winter. Their soils are typically sandy in nature but can also be rocky in some instances.

You can read on types and characteristics of rocks here.

Note: The subtropical desert have been reported to be so hot to an extent that rainfall evaporates from the atmosphere even before they hit the ground.

Examples of subtropical deserts include the followings:

  • Sahara desert in North Africa

  • Kalahari desert in South Africa

  • Chihuahua desert in USA

  • Mojave desert in USA

  • Great sandy desert in Australia

  • Sonoran desert in USA.

The plants (xerophytes) and animals found in subtropical deserts include cactus plants, snakes and a variety of insects. They are usually more active at night.

 

  • Coastal Desert

Coastal deserts are present around the earth's coastal regions between 20o to 30o latitude of the equator. They typically have a long warm summer and a short cool winter.

Examples of coastal deserts are the Atacama desert in Chile and Namib desert in Namibia.

You can read on the swamp forest biome here.

 

  • Cold Winter Desert

Cold winter deserts are also called the semi-arid deserts. As the name implies, they are characterized with a cold winter and dry summers. They also have a very low annual rainfall and snowfall. This lack of rainfall in cold winter deserts is caused by a phenomenon termed the rainshadow effect.

Think of a rainshadow effect as a process whereby moisture is prevented from reaching an area as a result of high mountains present around such area.

You can read on the components of an ecosystem here.

Examples of cold winter deserts include the Gobi desert in Mongolia and Red desert in USA.

 

  • Polar Desert

Polar deserts are found in the arctic and antarctica regions of earth. They have a characteristic cold temperature throughout the year.

An example of a polar desert is the antarctica.

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Alfred Ajibola is a Medical Biochemist, a passionate Academician with over 10 years of experience, a Versatile Writer, a Web Developer, a Cisco Certified Network Associate and a Cisco CyberOps Associate.


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NOTABLE POINTS IN Biology

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

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  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

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Please read on photosynthesis here

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