Introduction

Why read this book?

a photo of a brook in the woods
Knowing something about the organisms one sees while walking in the woods or any ‘natural area’ vastly enhances the enjoyment of the experience.

Why study anything? Because the enterprise of mentally applying yourself to a particular topic is itself fulfilling. Like many journeys, study can be boring and tiresome and often you wonder if you are getting anywhere at all. But eventually you will reach a place where you not only can see how far you have gone, but a place where you can see things that you couldnt see before, or maybe you reach a place where things that youve seen before now look different and perhaps more understandable.

Fundamentally, this is a biology book. Why study biology? Living things are fascinating for a wealth of reasons—their diversity, their complexity combined with a fundamental simplicity, their functioning that begs for explanation, the multiple ways that living things exhibit organization, the multiple interrelationships between different living things. Also, there is clearly a fascination of biology that stems from the fact that people are indeed biological in nature.

Why study inanimate(non-animal) life? This book studies a group of living things that are distinctive because they arent human, or mammalian or even animal in nature (hence the title). In particular, why why study plants, the primary subject of the book? There are at least three basic factors that make a study of plants particularly rewarding. First, plants are familiar organisms, things that are readily and commonly encountered, so much so that their fundamental biological nature is often ignored and they are simply considered inanimate components of the environment. Secondly, plants are extremely useful to human activities, not just as food but also by providing useful material and chemicals. Because of this, the study of plants has a connection to a host of human endeavors. Thirdly, plants are the most conspicuous members of what is considered the natural world’ or ‘the outside. Consequently, some understanding of plants can enhance the enjoyment of nature. An academic factor that makes plant study rewarding, and the reason for studying many inanimate (non-animal) organisms other than plants (e.g. fungi, bacteria) is that it enhances the understanding of other areas of biology by providing contrasting  structures, development patterns, and physiologies when compared to familiar organisms.

There are many other reasons why the study of plants is rewarding, Im confident that you will come up with additional reasons based on your own experience with the subject!

A brief history of the discipline of botany.

This book is a botany bookand the book is used in a course that is generally considered a botanycourse. Most people associate botanywith plants but this is a book studies a number of things that are not considered plants, why include them? The reason has to do with history and with classification.

Botany texts, like most of academia, have a great deal of inertia and, in terms of groups covered, this book perpetuates this. One hundred years ago, the field of biology was separated into botany and zoology, reflecting the binary taxonomy of the time that placed organisms into either plant kingdom or the animal kingdom. Botanists studied organisms (plants, algae, some bacteria) that were green (contained chlorophyll) and also other forms of life (e.g. fungi) that werent green but had some plant-likefeatures (cell wall, apparent lack of mobility, pattern of growth). As in any classification (more on this later!) there were organisms, most of whom were generally unicellular and small in size that had both animal-likeand plant-likecharacteristics and these were often covered in both botany and zoology courses. Textbooks and courses on botany and zoology were surveycourses, going group by group through the members of the plant or animal kingdom.

As the 20th century progressed, more and more biological knowledge accumulated that is common to all living things, topics like genetics, cell biology and biochemistry. Botany textbooks expanded from simply surveying the groups to covering basic biology, elements common to all living things, and also surveying the different groups. At the same time, botany and zoology departments merged into biology departments and introductory courses and textbooks reflected this merger.

Throughout the 20th century it became increasingly clear that the dichotomous classification (plants and animals) was undesirable for multiple reasons. In 1969, Robert Whittaker proposed a five-kingdom system with kingdoms of plants, animals, fungi, protists ands monerans. Monerans (= prokayotes) were primarily unicellular, with cells that lack nuclei and other organelles and clearly differed in several other cellular aspects from eukaryotes, which had cells with nuclei, membrane bound organelles and often were multicellular. The protist group contained both photosynthetic groups (algae) and non-photosynthetic groups, including many problematicorganisms that werent obviously plants, animals or fungi. In spite of the taxonomic changes, most botany textbooks did not alter their coverage, only slightly changing how topics were organized. A few botany textbooks focused only on organisms considered to be in the plant kingdom, omitting photosynthetic protists (algae) and fungi.

With the start of the 21st century Whittakers classification scheme fell out of favor, primarily because neither the protist group nor the monera group was a sound phylogenetic (evolutionarily-based, more details on this later) entity. Surveyinglife in an accurate phylogenetic sense became more difficult, especially for the groups formerly considered protists, whose members do not group nicely. Where you used to have one group (protists) you might now have a dozen groups, all fairly obscure. And while five kingdoms could be managed, twenty kingdoms is more challenging. In spite of this, most botany textbooks in use today still approach to the subject as they have in the past: discuss the biology common to all organisms then survey the groups, with the precise groups surveyed varying between books.

As a consequence of the expansion of cell and molecular information, the amount of coverage of plants and of inanimate life(everything other than animals) is drastically less than it was fifty years ago. The same can be said for other taxonomic groups: birds, fish, insects; but the problem is particularly significant for inanimate lifebecause it is fundamentally more obscure to most biology students and instructors. Additionally, the coverage given to what you might think of as organismal biology in general, what an organism is and how it functions, is very much reduced because the discussions of various groups is often dominated by taxonomic/phylogenetic/evolutionary aspects with primary concern placed upon where a particular group might be put with respect to other groups.

This book is both traditional and non-traditional. Although the kinds of organisms this text studies is similar to most botany texts of the last hundred years, the approach to study is very different. This book is focused organismal biology, not phylogeny/taxonomy. It considers most of the groups that were covered in traditional botany texts, that is, EBA = everything but animals: plants, fungi, bacteria/archaebacteria, and most of the organisms that used to be placed in the protist category. But the approach to these groups is organismaland comparative. It attempts to define the organism level of life (not as easy as you might assume) and then comparatively examines four features that define organisms: their structure, their means of reproduction, their acquisition of matter and energy, and their interactions with conditions and with other organisms. The approach is much more ecological (at the organism level) and much less phylogenetic/evolutionary than in botany texts or in introductory biology texts. A comparative approach, considering both the unifying features and the distinctive features of organisms, provides an enhanced perspective from which to consider the biology of plants.

Thus this book is focused at the intersection of two biological phenomena: organisms and plants. In spite of this focus, it considers a wide area of biologyfrom cells to communities, and from bacteria to fungi. And it considers a wide variety of organisms that are not now considered plants. Although this is intended as a botany textbook, it should be of interest to anyone interested in the scope of biology, even if they are not particularly interested in plants.

a diagram showing prokaryota on the bottom with Bacteria and archaea noted, and Eukaryota on the top, noting protista with fungi, animalia, and paltae as offshoots
A ‘tree of life’ diagram depicting groups (basically the 5-kingdoms of Whittaker but with Monerans (aka prokaryotes) separated into Bacteria and Archaea) and evolutionary relationships. This text covers all but the animal branch.

Media Attributions

License

Icon for the Creative Commons Attribution-ShareAlike 4.0 International License

Inanimate Life by George M. Briggs is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License, except where otherwise noted.