The circulatory system works closely with the respiratory system to transport oxygen and nutrients to different parts of the body. It also... View Article
Skin is a part of the integumentary system. It is the largest organ of the body. The integumentary system consists of skin, nails, hair and... View Article
Digestion of carbohydrates begins in the mouth with the action of salivary amylase secreted by salivary glands. Further reading: MCQs On... View Article
Systemic circulation starts with the heart pumping oxygenated blood from the left ventricle to the aorta, then through the arteries and... View Article
The three main types of phagocytes are neutrophils, monocytes and macrophages. They destroy microbes by phagocytosis. They form the cellular... View Article
Variations are the differences between individuals of the same species. E.g. colour of eyes, height, skin colour, etc. Variations occur due to... View Article
Linked genes are the genes, which are present in close proximity on the same chromosome. Linked genes are mostly inherited together as a parental... View Article
Golgi apparatus is a membrane-bound organelle present in the cytoplasm of eukaryotic cells. It is made up of many flat and disc-shaped sacs or... View Article
The primary function of glucose in the cell is to produce energy by catabolism. Glucose is the most common respiratory substrate and yields high... View Article
Insects use spiracles to breathe. Spiracles are tiny openings on the body surface, which leads to the trachea or respiratory tube. Further... View Article
Nitrogen is an essential element for living organisms. It is a part of many biomolecules, such as proteins, DNA, RNA, ATP, etc. Although it is... View Article
Phylogeny refers to the study of descent or evolutionary development of a species and evolutionary relationships between different organisms.... View Article
The main characteristics of chordates are the presence of a notochord, dorsal hollow nerve cord, post-anal tail and paired pharyngeal gill slits.... View Article
Dedifferentiation results in the formation of interfascicular cambium and cork cambium. Dedifferentiation is the process of regaining the... View Article
Aerobic respiration is the most efficient form of respiration. Theoretically, there can be a net gain of 38 ATP molecules by the complete... View Article
Endocytosis is the process of internalisation of substances into the cell. The substance gets surrounded by the cell membrane and then buds off... View Article
The most toxic nitrogenous waste is ammonia and uric acid being the least toxic. Ammonia requires a large amount of water for excretion. Aquatic... View Article
The two domains of prokaryotes are bacteria and archaea. The cell wall of archaebacteria differs from bacteria, which makes it possible to... View Article
The cardiac cycle begins, when an action potential is generated at sino-atrial nodes (SAN), resulting in atrial contraction or systole, followed... View Article
Eukaryotes are classified according to cellular structure, mode of nutrition, body organisation and phylogenetic relationship. R.H. Whittaker... View Article