Serendipity means a "fortunate happenstance" or "pleasant surprise". It was coined by Horace Walpole in 1754.

Sálim Moizuddin Abdul Ali was an Indian ornithologist and naturalist. Sometimes referred to as the "birdman of India", Salim Ali was among the first Indians to conduct systematic bird surveys across India and his bird books helped develop ornithology.

The ozone layer is mainly found in the lower portion of the stratosphere, from approximately 20 to 30 kilometres (12 to 19 mi) above Earth.

 William Bateson in 1905 coined the term genetics from the word gene.

 Dendrology is the science and study of wooded plants (trees, shrubs, and lianas), specifically, their taxonomic classifications.

 Microbiology is the study of microscopic organisms, those being unicellular (single cell), multicellular (cell colony), or acellular (lacking cells).

 Pathology is a branch of medical science primarily concerning the examination of organs, tissues, and bodily fluids in order to make a diagnosis of disease.

Giovanni Faber has been credited with inventing the name "microscope".

 William Harvey is known as the father of blood circulation.

 Animals that live and subsist on other animals are parasites. Parasitology is the study of parasites, their hosts, and the relationship between them.

 The only microscope that gives 3D' images is scanning electron microscope.

 Osteogenesis is the process of formation of bones.

The study of flowers is called horticulture.

 Arthrology is the science concerned with the study of anatomy, function, dysfunction and treatment of joints and articulations.

 Rearing of bees is called apiculture.

 The ostrich is the largest living species of bird and lays the largest eggs of any living bird.

 Calar Naturae (ladder of nature) is a theory in which all things are placed in a hierarchy.This theory was given by Aristotle.

 World Environment Day is celebrated on 5th June.

Correct sequence is Observation, Hypotheses, Experiment and Theory. 

 Adaptations are necessary for survival.

 The most important characteristic of a living organism is reproduction. Reproduction is a fundamental feature of all known life; each individual organism exists as the result of reproduction.

 Discovery of Archimedes principle is an example of serendipity.

 Automatic healing of a minor injury is an example of regeneration.

An electron microscope is a scientific instrument which uses electromagnetic coils.

 A series of trophic levels, through which food passes in an ecosystem, is called food chain.