Brinjal and potato both belong to same genus as they share some common correlated characters.
They belong to different species because they have
(i)  different morphological features
(ii)  reproductive isolation (inability to interbreed).

The knowledge of the characteristics of an individual or its whole population helps in the identification of similarities and dissimilarities among individuals of the same kind or between different types of organisms. ex

Both are two different species included in genus Solanum.

Living organisms can be divided into different taxa based on their characteristics.This process of classification is called taxonomy.

Key is a booklet containing a list of characters and their alternates, which are helpful in identification of various taxa, i.e., class, order, family, genus and species.

Largest botanical garden in the world is Royal Botanical Garden, Kew (London).
Some well-known botanical gardens in India are
(i) National Botanical Garden, Lucknow
(ii) Lloyed Botanical Garden, Darjeeling
(iii) Indian Botanical Garden, Sibpur, Kolkata

ICZN stands for International Code of Zoological Nomenclature.

Monograph, mannuals.

It is because of the great variability in languages in different parts of the word.

Reproduction is required for the perpetuation of a population. It is not necessary for the survival of living organism. Many organisms, e.g., mules, sterile worker bees, infertile human couples are not able to reproduce, while they have all other defining properties of life, so they can be called as living.
Sexual reproduction involves the formation and fusion of two kinds of gametes to produce an offspring. In asexual reproduction, new individuals can arise by the specialised parts of body or without the fusion of gametes.

Amoeba shows various characteristics such as growth, reproduction, metabolism, etc., that are specific to living organisms. On the other hand, a sand particle does not show any reproduction and metabolism therefore, it is considered as non-living matter. Though, the sand particle shows growth which is also a characteristic of living things, but in this the growth is only external due to aggregation of many sand particles and not internal. Therefore, Amoeba is a living matter while a sand particle is a non-living matter.

Taxonomical aids are helpful in various fields such as agriculture, forestry, industry and in knowing our bioresources.
All the above-mentioned studies need correct identification and classification of organisms. Identification of organisms requires intensive laboratory and field studies.
Biologists use herbarium, botanical gardens, museum, zoological parks, and taxonomical keys while doing taxonomical studies.

(i) Lion and monkeys possess the mammalian characters.
(ii) Maintaining zoological parks conserver the endangered and critically endasgered species.
(iii) The natural biosphere reserves have variety of plants. 
(iv) Ria is a good observer, enthusiastic and nature loving.

An organism is said to be living, if it shows certain characteristic features that make it different from non-living things.
The following properties are defining features of a living organisms.
(i)  Growth : All living organisms show growth either by multiplication or by increase in size. Growth in living things is internal.
(ii)  Reproduction : All living things produce offsprings, possessing features similar to their parents. Thus, reproduction is essential to maintain the continuity of life on earth.
(iii)  Metabolism : It is the sum total of reactions occurring inside the body by which living things assimilate energy and use it for growth.
(iv)  Cellular Organisation : The cells are the structural and functional unit of every living organism.