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 savannaAcademic Questions in Biology
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.
_____ is a bone that constitute the axial skeleton.
Which of the following is false concerning cartilages and bones?
A diagram showing the movement of energy through a food chain is called a _____.
Which of the following is NOT a part of the wrist bones (or carpal bones)?
The term 'skeletal material' should not be confused with 'types of skeleton'. In simple terms, think of a skeletal material as the kind of substance in which a skeleton is composed of. As an instance, the skeleton of humans are composed of bones and cartilages and these are their skeletal materials.
Please read more on skeleton here.
The materials that make up the skeleton are different in animals. As stated ealier, the skeleton of humans is composed of both cartilages and bones. Meanwhile, some fishes have their skeletal material composed entirely of cartilage. These are called cartilaginous fishes. However, with regards to insects (e.g cockroach) and crustaceans (e.g crab), their skeleton is composed of a special material called chitin. Therefore, chitin makes up the skeletal material in insects and crustaceans (anthropods).
Please read on the skeletal material 'cartilage' and its functions here.
The skeletal materials in animals can be put into 3 types. These are:
Chitin is a skeletal material found in insects and anthropods. Cockroaches and grasshoppers are examples of insects while shrimps and crabs are examples of anthropods.
This skeletal material (chitin) is present outside the organism as a protective layer and this makes it an exoskeleton. However, always understand that an exoskeleton is a type of skeleton.
The image below shows some insects in possession of chitin (which is a component of an exoskeleton).
Chitin is not a living tissue and thus does not grow along with the organism. Functionally, it protects the soft internal tissues in organisms that possesses them.
Please read on the basic characteristics of life here.
Chitin is a structural polysaccharide composed of repeating units of modified glucose molecules. In short, chitin is simply a complex sugar.
Please read more on carbohydrates and sugars here.
In order for organisms (with chitin as skeletal material) to grow, they must shed or put off their chitin to the environment. After their growth, these organisms will regenerate a new chitin. This is why you may have seen the chitinous reminants of cockroaches in the corners of homes or inside a box of old clothes.
The process through which living organisms grow by shedding off their chitin is termed moulting or ecdysis.
You can read on the differences between bones and cartilages here.
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Amazing facts in Biology
99% of a panda's diet is bamboo. They may eat fish or other small animals occasionally
When attacked by insects, lima beans plant will often command parasitic wasps to their defence.
When the leaves of the lima bean's leaves are eaten by insects, the plant gives off a substance that signals parasitic wasps to swam in, destroying its enemies (the leaf-eating insects) in the process
Frogs drink water through their skin
Armadillos are western mammals known for their unique armor-like shell which are bulletproof
Although zebras are known for their characteristics black and white stripes, we still have some polka-dotted zebras
Charles Darwin is a British naturalist and biologist who contributed greatly into the study of evolution. According to research, he frequently ate the animals he studied
Lungs are the only human organ that can float on water
Unlike most snakes that lay eggs, anacondas give birth to live babies
A shrimp's heart is in its head
Women have more pain receptors than men
NOTABLE POINTS IN Biology
For a thing to be considered living, it must possess all the basic characteristics of life. These include:
Movement
Respiration
Nutrition
Irritability or Sensitivity
Growth
Excretion
Reproduction
Death
Adaptation
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
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:
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:
Movement
Respiration
Nutrition
Irritability or Sensitivity
Growth
Excretion
Reproduction
Death
Adaptation
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
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