Question

Explain merits and demerits of system of classification

Answer 1

Merits

1. It adopts the phylogenetic principle of monophyly.

2. It has derived information from sources like

morphology, embryology, molecular biology, anatomy, palynology, and

phytochemistry.

3. Formal names are given only where monophyly has been

firmly established.

4. It is based on the recent advances in research and is

gaining authority.

Demerits

1. It is limited to the taxonomic level of order and

family.

2. It is not very popular.

3. Several families or genera have not been placed yet.

4. The orders are recognized under informal groups like

Magnoliids, Eudicots. These names do not conform to the ICBN.

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Answer 2

Answer:

Depending upon the exchange of energy and matter with the environment, thermodynamic sys- tems are classified as open, closed or isolated. A system that can freely exchange energy and matter with its environment is called an open system. Example: water boiling in an open vessel. A system that can freely exchange energy but not.matter with its environment is called a closed system. Example : water boiling in a closed vessel. A system that cannot exchange energy as well as matter with its environment is called an isolated system. In practice it is impossible to realize an isolated system as every object at a temperature.above 0 K emits energy in the form of radiation, and.no object can ever attain 0 K. For many practical purposes, a thermos flask containing a liquid can be considered an isolated system.