Unity and Diversity of Life in Biology

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42 Questions

What is the common heritage that unites all life forms?

Common ancestor

What is the reason behind the diversity of living things?

Evolutionary forces

What is the biosphere ecosystem?

Giant web of life

Which of the following organisms are unicellular (microscopic)?

Bacteria and Paramecium

What distinguishes Paramecium from Bacteria?

Eukaryotic nature

Which living things are prokaryotes?

Bacteria and Paramecium

'All living things are composed of similar chemical elements' - Which scientific principle does this statement reflect?

Laws of chemistry and physics

'Plants are photosynthetic and make their own food' - What distinguishes plants from the other organisms mentioned?

'Not making their own food'

'Living things often function and behave in ways strange to humans' - Which feature of living things does this statement emphasize?

'Unusual behavior'

'Living things are diverse because of the evolutionary forces' - What is responsible for the diversity of living things according to this statement?

'Evolutionary forces'

What do all life forms share according to the text?

Common chemistry

Which statement reflects the unity of all life forms?

They have a common heritage and share common chemistry

Which characteristic is used to define life?

Ability to carry out metabolic reactions

What is the smallest structural and functional unit of all living things?

Cells

What is the science of classifying organisms into categories known as?

Taxonomy

What is the sequence of classification categories from larger to smaller?

Domain, Kingdom, Class, Order

What is a two-part scientific name called?

Binomial name

Which characteristic is shared by all living organisms?

Organization from atoms to the biosphere

What do multicellular organisms have that unicellular organisms do not?

Tissues

What does the nervous system include?

Brain, spinal cord, and a network of nerves

What does a binomial name consist of?

Genus and Species

What belongs to an organ system in multicellular organisms?

More than one organ

What is the most closely related category in the sequence of classification categories?

Genus and Species

What characterizes life best according to the text?

Metabolic reactions for energy acquisition

What is the first step in the organization of living systems according to the text?

Atoms

Which characteristic is NOT shared by all living organisms according to the text?

Photosynthesis

What is the smallest unit of life according to the text?

Atom

What is the sequence of classification categories from larger (more inclusive) to smaller (least inclusive) according to the text?

Kingdom, Family, Genus, Phylum

What is responsible for the diversity of living things according to the text?

Metabolic reactions

What distinguishes plants from other organisms mentioned in the text?

Photosynthesis

What is the most closely related category in the sequence of classification categories according to the text?

Species

What is the science of classifying organisms into categories known as?

Evolutionary biology

'Plants are photosynthetic and make their own food' - What characterizes plants according to this statement?

Autotrophic nutrition

What does the nervous system include according to the text?

Brain, spinal cord, and a network of nerves

What is the fundamental reason for the diverse forms of life on Earth?

Genetic mutations and natural selection

Which statement best characterizes the unity of all life forms?

Shared genetic code, chemistry, and basic life processes

What distinguishes Paramecium from Bacteria and other organisms mentioned in the text?

Complex cellular structure

What feature emphasizes the reason behind the diverse functions and behaviors seen in living things?

Adaptation to environmental changes

'Plants are photosynthetic and make their own food' - What distinguishes plants from the other organisms mentioned?

Mode of nutrition

'All living things are composed of similar chemical elements' - Which scientific principle does this statement reflect?

Principle of atomic composition

'Living things often function and behave in ways strange to humans' - Which feature of living things does this statement emphasize?

Behavioral diversity

'Existence of living things depends on one another, and collectively they form a giant web of life that is spread around the globe- Biosphere ecosystem' - What does this highlight about living things?

Interconnectedness and interdependence

Study Notes

Characteristics of Life

  • All living things are composed of similar chemical elements, reflecting the scientific principle of unity among living organisms.
  • Living things often function and behave in ways strange to humans, emphasizing their unique characteristics and behaviors.
  • The characteristic that defines life is the ability to function and behave in unique ways.

Diversity of Living Things

  • The diversity of living things is due to evolutionary forces.
  • The reason behind the diversity of living things is the variation in the evolutionary forces that act upon them.

Cell Structure

  • The smallest structural and functional unit of all living things is the cell.
  • Unicellular organisms are microscopic and include Paramecium and Bacteria.
  • Paramecium is distinguished from Bacteria by its characteristics.

Classification of Organisms

  • The science of classifying organisms into categories is known as taxonomy.
  • The sequence of classification categories from larger to smaller is: domain, kingdom, phylum, class, order, family, genus, and species.
  • A two-part scientific name is called a binomial name.
  • The most closely related category in the sequence of classification categories is species.

Multicellular Organisms

  • Multicellular organisms have organs, organ systems, and tissues that are not found in unicellular organisms.

Nervous System

  • The nervous system includes the brain, spinal cord, and nerves.

Ecosystem

  • The biosphere ecosystem is a giant web of life that is spread around the globe, highlighting the interdependence of living things.
  • The existence of living things depends on one another, emphasizing their interconnectedness.

Plants

  • Plants are photosynthetic and make their own food, distinguishing them from other organisms.
  • This characteristic of plants allows them to produce their own food through photosynthesis.

Explore the concepts of unity and diversity in the study of life, where all living forms share a common heritage and basic life processes, yet exhibit diversity due to evolutionary forces over time.

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