Theories of origin of life on Earth
Origin of Earth: hypothesis It has been assumed that life has been originated about 5-6 billion years ago. Two hypotheses has been proposed for the […]
Zoology
Genetic variation as a cause of evolution
What is genetic variation? A representation of the genetic differences that occur within a population is termed as genetic variation. The genetic variation of whole […]
Theory of evolution by Natural selection
What is evolution? Evolution is a change in the inherited traits of a population over time via the process of natural selection that might result […]
Speciation: causes, process, types and examples
What is Speciation? In evolution, speciation is the process that results in the formation of new and distinct species that are isolated from one another. […]
Human Brain: Structure and Functions of different parts
Anatomy of Human brain: Human brain weighs about 1.5 kilograms (3.3 lbs) and is larger in relation to body size. It is the most complex […]
Digestive glands in Human digestive system, their secretions and functions
Structure and Functions of Human Digestive glands: The glands that secrete digestive juices for the digestion of food are termed digestive glands. Besides the number […]
Nervous system of Earthworm
Do earthworms have nervous system? Earthworm has a well-developed nervous system. The nervous system is metamerically segmented. The nervous system is divisible into central, peripheral […]
Reproductive system of Earthworm
Reproduction in Earthworm Earthworm are monoecious or hermaphrodite or bisexual. However, self-fertilization doesn’t occur because of relative location of male and female reproductive organs as […]
Circulatory system of Earthworm
Circulatory system of the earthworm: In earthworm, the blood vascular system is of closed type. Blood vascular system is different in first 13 segments as […]
Digestive and excretory system of Earthworm
Digestive system of earthworm: Details on digestive and excretory system of earthworm Structure of Alimentary canal of Earthworm Alimentary canal is a long straight tube […]