SSC Biology Question 2019 Dhaka Board
SSC Biology Question 2019 Dhaka Board. Biology is a natural science concerned with the study of life and living organisms, including their structure, function, growth, evolution, distribution, and taxonomy. Modern biology is a vast and eclectic field, composed of many branches and subdisciplines.
However, despite the broad scope of biology, there are certain general and unifying concepts within it that govern all study and research, consolidating it into a single, coherent field. Biology generally recognizes the cell as the basic unit of life, genes as the basic unit of heredity, and evolution as the engine that propels the synthesis and creation of new species. It is also understood today that all organisms survive by consuming and transforming energy and by regulating their internal environment to maintain a stable and vital condition.
SSC Biology Question 2019 Dhaka Board
Subdisciplines of biology are defined by the scale at which organisms are studied, the kinds of organisms studied, and the methods used to study them: biochemistry examines the rudimentary chemistry of life; molecular biology studies the complex interactions among biological molecules; botany studies the biology of plants; cellular biology examines the basic building block of all life, the cell; physiology examines the physical and chemical functions of tissues, organs, and organ systems of an organism; evolutionary biology examines the processes that produced the diversity of life, and ecology examines how organisms interact in their environment.
Our fascination with biology has a long history. Even early humans had to study the animals they hunted and know where to find the plants they gathered for food. The invention of agriculture was the first great advance of human civilization. Medicine has been important to us from the earliest history as well. The earliest known medical texts are from China (2500 B.C.), Mesopotamia (2112 B.C.), and Egypt (1800 B.C.).
In classical times, Aristotle is often considered to be the first to practice scientific zoology. He is known to have performed extensive studies of marine life and plants. His student, Theophrastus, wrote one of the West’s earliest known botanical texts in 300 B.C. on the structure, life cycle and uses of plants. The Roman physician Galen used his experience in patching up gladiators for the arena to write texts on surgical procedures in A.D. 158.
During the Renaissance, Leonardo da Vinci risked censure by participating in human dissection and making detailed anatomical drawings that are still considered among the most beautiful ever made. The invention of the printing press and the ability to reproduce woodcut illustrations meant that information was much easier to record and disseminate. One of the first illustrated biology books is a botanical text written by German botanist Leonhard Fuchs in 1542. The binomial classification was inaugurated by Carolus Linnaeus in 1735, using Latin names to group species according to their characteristics.
Microscopes opened up new worlds for scientists. In 1665, Robert Hooke used a simple compound microscope to examine a thin sliver of cork. He observed that the plant tissue consisted of rectangular units that reminded him of the tiny rooms used by monks. He called these units “cells.” In 1676, Anton von Leeuwenhoek published the first drawings of living single-celled organisms. Theodore Schwann added the information that animal tissue is also composed of cells in 1839.
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