Life Science & Environment Quiz

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Questions and Answers

What is the branch of biology that deals with the study or principles of arrangement or classification of organisms called?

Taxonomy

What does "taxis" mean?

arrangement

The first attempt of classification is observed in Chandoyoga Upanishad.

True (A)

Hippocrates classified the living organisms into animals and plants.

<p>True (A)</p> Signup and view all the answers

Aristotle classified the living organisms into animals and plants.

<p>True (A)</p> Signup and view all the answers

Linnaeus (1707-1778) classified animals into three categories: Jivaja (viviparous), Andaja (oviparous) and Udbhija (vegetal origin).

<p>False (B)</p> Signup and view all the answers

Why has taxonomy become essential for the study of organisms today?

<p>The number and diversity of living organisms is so enormous that it is impossible to study without classifying them into certain groups or categories.</p> Signup and view all the answers

What is the estimated number of species present on earth?

<p>30 million</p> Signup and view all the answers

Flashcards

What is Taxonomy?

The branch of biology dealing with the principles and procedures of classification, nomenclature, and identification of organisms.

Medicinal Plants in Medicine

Plants used for medicinal purposes, like Penicillium, Rauwolfia, Aloe vera, Cinchona, and Belladonna, have significant medical applications.

What is Space Biology (Exobiology)?

A new branch of science focusing on the study of life in space, including the effects of space travel and extraterrestrial environments on organisms.

What is Chlorella?

A type of green algae used by astronauts in spacecrafts to convert carbon dioxide into oxygen.

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What is Taxonomic Hierarchy?

The process of classifying organisms based on their shared characteristics, creating hierarchical groups like kingdoms, phyla, classes, orders, families, genera, and species.

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What is Phylogeny?

The study of the evolutionary relationships and history of life forms.

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What is Nomenclature?

The naming of organisms according to agreed-upon rules and conventions, ensuring a consistent and internationally recognized system.

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What is Identification?

The process of identifying an organism by comparing its characteristics to a known classification system, using various tools and techniques like observation, analysis, and comparisons.

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What is Ecology?

The study of the interactions between living organisms and their environment.

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Who is Carl Linnaeus?

The Swedish scientist who developed a hierarchical classification system for living organisms in the 18th century, laying the foundation for modern taxonomy.

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What is Biology?

The branch of biology that studies the processes of life, including cell structure, function, growth, reproduction, and heredity.

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What is Microbiology?

The branch of biology concerned with the study of bacteria, archaea, and viruses.

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What is Mycology?

The branch of biology that studies fungi.

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What is Penicillin?

A natural product obtained from Penicillium fungus, a powerful antibiotic used to treat various bacterial infections.

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What is Rauwolfia?

A plant used in traditional medicine for its calming and sedative properties, with active compounds like reserpine.

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What is Aloe vera?

A succulent plant with various medicinal properties, including wound healing and skin soothing.

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What is Cinchona?

A tree that produces quinine, an anti-malarial drug used to treat malaria, a deadly disease.

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What is Belladonna?

A poisonous plant containing alkaloids that can cause hallucinations and paralysis, used sparingly in traditional medicine.

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What is Morphological Classification?

The classification of organisms based on their physical characteristics, morphology, and anatomy.

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What is Phylogenetic Classification?

The classification of organisms based on their evolutionary history and relationships, often using molecular evidence.

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What is Biochemical Classification?

The classification of organisms based on their biochemical and molecular characteristics, such as DNA sequences and protein structures.

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What is a Taxon?

Any group of organisms, regardless of its taxonomic level, that shares common characteristics or traits.

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What is Integrated Taxonomy?

The process of using multiple sources of evidence, including morphology, phylogeny, and biochemistry, to classify organisms.

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What is Biogeography?

The study of the diversity and distribution of life across the globe, examining the factors that influence the range and abundance of species.

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What is Systematics?

The science of naming and classifying organisms, establishing a standardized system for identification and communication.

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What is Evolution?

The scientific study of the origin, history, and relationships of life forms.

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Study Notes

Life Science & Environment

  • Plants provide natural products for treating various illnesses
  • Medicinal plants include Penicillium, Rauwolfia, Aloevera, Cinchona, and Belladonna
  • Diseases treatable with antibiotics like Penicillin, Chloromycetin, and Streptomycin
  • Space Biology (Exobiology) is a new field combining space research and biology
  • Chlorella, a green algae useful in space, produces oxygen during photosynthesis

Taxonomy and Taxonomic Hierarchy

  • 1.7 million species of living organisms are currently known
  • Many additional species are yet to be discovered (~15,000 new species annually)
  • Estimating the total number of species could reach 30 million species globally.
  • Classifying organisms is crucial for studying and identifying them.
  • Taxonomy is the branch of biology focusing on classification, nomenclature, and identification of organisms.
  • "Taxonomy" derived from Latin words "taxis" (arrangement), and "nomos" (rules/laws).
  • Early classification systems:
  • Historical records (2500-650 BCE) included 740 plants and 250 animals
  • Chāndogya Upaniṣad classified organisms into three groups (Jivaja, Andaja, Udbhija)
  • Hippocrates and Aristotle also contributed to early biological classification
  • Categorized organisms as plants and animals
  • Aristotle further divided animals into four groups

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