Plants and their parts are dried up to be preserved and they are kept in herbariums for future reference.

A taxonomic aid is a storage of record of either live or dead specimens of flora or fauna, which helps scientists in taking reference to study classification.

Kingdom, Phylum, Class, Order, Family, Genus and Species.

The organisation in a  living body produces a new functional entity, which has its own properties not found in its components. Hence, a cell organelle is the one having its own properties not found in its molecular constituents.

No, this is not growth, as increase in size of ball of snow is just because of the addition of similar material externally.
In living organisms, growth is due to increase in body material from inside.

Non- living things also show growth, e.g., a mountain or sand dune grows by accumulating material externally on surface. But, this growth is considered as external growth in comparison to the growth of living things which is internal.

The living things possess following features, which are not present in non - living things
(i) growth and metabolism
(ii) reproduction
(iii) ability to sense stimuli (consciousness)
(iv) ability to self-replicate and self-organise

In plants, growth continues throughout the life as they have meristematic regions, where the cell division occurs continuously. In animals, growth occurs only upto a certain age, after which cells divide only to replace worn out and lost cells.

The sum total of all chemical reactions occurring in an organism due to specific interactions amongst different types of molecules within the cells, is called metabolism.

In unicellular organisms like Amoeba, growth is synonyms with reproduction and takes place by increase in number of cells by mitotic cell division.

In unicellular organisms like Amoeba, bacteria and unicellular algae, reproduction is synchronised with growth, i.e. they reproduce and grow by increase in number of cells.

(i)  Filamentous algae
(ii)  Peritonea of mosses

Living things grow either by increase in cell number or increase in cell mass.

Manuals and records basically help in understanding past flora and fauna of a given area. Take an example of a thriving city. There may had been a dense forest, rich in biodiversity, where we get to see densely populated cities today. The manuals and records of that area helps us in knowing about past richness in biodiversity.
We also come to know about extinct species, through manuals and records. Some of the extinct species may be close or distant relatives of some existing species. We can develop some evolutionary relationships between them.

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.

The three-domain system was first invented in 1990. One main characteristic of the three domain method is the separation of Archaea and bacteria, previously, grouped into the single Kingdom Bacteria (or Monera). The three domains of life are as follows:
(a) Archaea
(b) Bacteria and
(c) Monera.

It is difficult and dangerous to study ferocious animals in their natural habitats. Further, it is cruel to study them in captivity. So zoological garden is a better option. Scientists can study different behavioural patterns, like feeding habits, mating rituals. This can help in a better understanding about them.