Introduction to Biology

Q. Define Biology. Elaborate major fields of Biology.

Biology: Biology is the science of life. The word "Biology" comes from two Greek words "bios" (life) and "logos" (study). It explores the structures, functions, and interactions of living organisms.

Major Fields of Biology: Biology is a vast field that explores the incredible diversity of life on Earth. To better understand this complexity, scientists have divided biology into three main fields:

• Zoology: It is the study of animals, including their structure, function, behaviour, and classification.
• Botany: It is the study of plants, including their structure, growth, reproduction, and interactions with their environment.
• Microbiology: The study of microorganisms, such as bacteria and microscopic fungi is called microbiology. It includes the study of the structures, functions, habitats and reproduction of microorganisms, and their impacts on health and environment.

Q. Write a note on different branches of Biology.

• Morphology: Morphology is the study of the form and structure of organisms. Morphology studies the outward appearance (shape, colour, pattern etc.) as well as internal structures like organs.
• Anatomy: Anatomy is the branch of Biology that explores the internal physical structure of organisms, particularly humans. It helps in disease diagnosis, medical device development, and improving quality of life e.g., the study of the organs of the digestive system.
• Physiology: Physiology is the branch of Biology that deals with the functioning of body parts. For example, how the blood circulatory system transports vital substances throughout the body.
• Embryology: Embryology is the study of the process of development of an organism from a fertilized egg. In this branch, scientists study organ and tissue formation, identify birth defects, and develop medical treatments.
• Genetics: Genetics is the branch of Biology that deals with the study of transfer of characteristics from parents to offspring. In Genetics, scientists also study the causes of genetic diseases, and develop better varieties of plants.
• Molecular Biology: Molecular Biology deals with the study of biological molecules like carbohydrates, proteins, lipids, and nucleic acids. Molecular biologists also study fundamental life processes, develop drugs, and create genetically modified organisms.
• Histology: Histology is the microscopic study of tissues. Tissues are groups of cells that have similar functions. Tissue examination helps in disease diagnosis, drug studies, and understanding organ structure and function.
• Cytology: Cytology is the study of cells, i.e., the building blocks of life. Cytologists unravel the fundamental structures of cells and their organelles. They also study the mechanisms of cell division.
• Palaeontology: Palaeontology is the branch of Biology that deals with the study of fossils. The examination of fossils helps scientists to know the evolutionary history of organisms. For example, dinosaur fossils provide evidence of giant reptiles that roamed the Earth millions of years ago.
• Taxonomy: Taxonomy is the branch of Biology that deals with the classification of organisms into groups on the basis of similarities and differences. Classification of organisms helps to organize and understand the diversity of life, identify new species, and study evolutionary relationships.
• Ecology: Ecology is the branch of Biology that deals with the relationships between organisms and their environment. Ecology helps to conserve biodiversity and address environmental problems. The food chain, for instance, illustrates the interconnectedness of organisms for energy and nutrients.
• Marine Biology: Marine Biology is the branch of Biology that deals with the study of life in oceans and saltwater. It helps to understand ocean biodiversity, discover new species, and address marine conservation issues. For example, coral reefs support a wide variety of marine life.
• Pathology: Pathology is the study of diseases, their causes, and effects. Pathology helps in disease diagnosis, treatment development, and disease prevention. Cancer, for instance, is characterized by uncontrolled growth and spread of abnormal cells.
• Immunology: Immunology is the branch in which we study the components of the immune system and their role against diseases. Immunologists study to develop vaccines, treat autoimmune diseases, and improve immune responses to infections.
• Pharmacology: Pharmacology is the branch in which we study drugs and their effects on the body. This helps in the development of new drugs. For example, new antibiotics are developed that are used to kill bacteria and treat bacterial infections.

Q. Discuss Relation of Biology with other Sciences.

Biology is closely linked with other natural sciences such as Chemistry, Physics, and Earth Sciences. These connections help us understand life processes, environmental interactions, and the complexities of living organisms.

• Biochemistry: Biochemistry is the study of the structure and reactions of different chemical substances present in living systems. The study of the chemical reactions of photosynthesis and respiration are examples of Biochemistry.
• Biophysics: It deals with the study of the principles of Physics, which apply to biological processes. For example, in Biophysics we study the rules of lever and motion for understanding the function of muscles, bones and joints.
• Computational Biology: In Computational Biology, scientists use Mathematical models, algorithms, and computer simulations to understand biological systems and relationships. It involves analysing biological data, such as sequence of amino acids in a protein.
• Biogeography: It deals with the study of the distribution of living organisms in different geographical regions of the world. The influence of climate change on the distribution of organisms is also studied in Biogeography.
• Biostatistics: It deals with the principles of statistics to analyse and interpret data related to living organisms. Biostatistics plays a crucial role in biological research, healthcare, and public health etc.
• Biotechnology: It deals with the use of living organisms or their components to develop beneficial products or processes for various fields, including healthcare, agriculture, and environmental management. For example, Biotechnologists use bacteria for the production of insulin to treat diabetic patients.
• Bioeconomics: It deals with the study of organisms from economical point of view. In bio-economics, scientists calculate and compare the cost and profit of the biological projects e.g., production of new variety of crops.

Science is a collaborative field: Science is a collaborative field in which researchers from various disciplines work together to solve complex problems. Interdisciplinary teams can tackle problems more efficiently by leveraging the strengths and expertise of each discipline. Examples include:

• Human Genome Project: Aimed to sequence and map the entire human genome. Completed in 2003, involving biology, genetics, informatics, and computer science.
• Climate Change Research: Requires atmospheric science, ecology, economics, and sociology.
• Medical Research: Cancer research involves oncologists, biologists, biochemists, geneticists, pharmacologists, and statisticians.
• Robotics and AI: Involves computer science, engineering, mathematics, neuroscience, and psychology.
• Space Exploration: NASA and ISS involve astrophysics, planetary science, biology, and medicine.

Q. Explain how the study of Biology can lead to different professional studies.

The students of Biology get a comprehension of the various phenomena of life sciences. After their FSc with Biology, they can select further studies for diverse careers:

• Medicine and Surgery: The profession medicine deals with the diagnosis and treatment of diseases. In surgery the defective parts of the body are repaired, replaced or removed. For this profession, students need to complete a 5-year Bachelor of Medicine, Bachelor of Surgery (MBBS) degree.
• Dentistry: Dentists specialize in oral health, diagnosing and treating dental issues and performing surgeries. For it, the students can pursue a 4-year Bachelor of Dental Surgery (BDS) degree.
• Pharmacology: Pharmacologists study the effects of drugs on human body and develop new medications. For this career, a Bachelor of science (BS) degree in Pharmacy or Doctor of Pharmacy (D.Pharm) degree is required.
• Physiotherapy: It is the therapy that is used to restore movement and physical function of body that has been impaired by disease or injury. Physiotherapists use physical exercise and physical modalities (such as massage) to improve patient's physical movement and function. To become a physiotherapist, a 4-year BS degree in Physical Therapy or Physiotherapy is needed.
• Fisheries and Wildlife: Fisheries and wildlife departments also offer jobs to the biologists after a BS and Master of science (MS) degree in Zoology, Fisheries or Aquaculture.
• Agriculture: Agricultural scientists improve farming practices, crop production, and sustainable agriculture techniques. A 4-year BS degree in Agriculture is required.
• Animal Husbandry: This field involves breeding and caring for livestock to improve their quality and productivity. For it, students can pursue a 4-year BS degree in Animal Husbandry.
• Horticulture: Horticulturists cultivate fruits, vegetables, flowers, and ornamental plants. A 4-year BS degree in Horticulture is required for it.
• Forestry: Foresters manage and conserve forests and wildlife. A 4-year BS degree in Forestry is necessary.
• Farming: Farmers grow crops and raise animals for food and other products. A 4-year BS degree in Agriculture or specific farming courses is required for this profession.
• Biotechnology: Biotechnologists use biological processes to develop products and technologies in medicine, agriculture, and more. A 4-year BS degree in Biotechnology is required.
• Forensics: Forensic scientists analyze physical evidence from crime scenes to help in criminal investigations. A 4-year BS degree in Forensic Science is needed for this.

Other Careers:

• Veterinary Medicine: Diagnosis and treatment of diseases in animals and surgeries.
• Environmental Science: Solving issues related to pollution and natural resources.
• Genetic Counselling: Providing support to people on genetic conditions and testing.
• Nutrition and Dietetics: Advising on proper dietary habits to promote health.
• Public Health: Improving the health of communities through education, policy making, and research.
• Biomedical Engineering: Designing and making medical equipment to improve patient care.
• Bioinformatics: Analysis of biological data by using computational tools.

Q. What do you know about the instructions of Quran to reveal the study of life?

In the Holy Quran, there are several verses that highlight the study of life. Here are a few Quranic guidelines that encourage exploring and reflecting on the study of life:

• Creation from Water: "We made every living thing from water." (Sura: Ambia, Verse: 30). The Quran mentions in multiple verses that all living things were created from water. Water is described as a divine blessing from God. Living things consist of 85 to 90 percent of water, and the above verse hints at the common origin of all living things in water.
• Creation of Human Beings: "He made man from clay like the potter." (Sura: Rehman Verse: 14). By the hints given in both these Verses, we can find the order of events that occurred in the creation of human beings. God also hints at the method of the development of animals including human beings: "Then fashioned We the drop a clot, then fashioned We the clot a little lump, then fashioned We the little lump bones, then clothed the bones with flesh." (Sura: Al-Mominoon, Verse: 14).
• Creation of Animals: The Quran also describes the common origin and modification of animals. "Allah hath created every animal from water. Then some of them creep up over their bellies, others walk on two legs, and others on four. Allah creates what He pleases." (Sura: Al-Nur, Verse: 45). This verse explains that God created early life in water (fishes) and then animals with limbs were evolved. Among such animals some were created who creep over their bellies and then some were created who walked on 2 and some on 4 legs.

Q. What are the basic steps a scientist adopts in order to solve scientific problem?

Scientific Method: Scientists take specific steps for doing scientific work or research. These steps are collectively called scientific method. For biological research, these steps are called biological method. The following steps are involved:

1. Recognition of a scientific problem
2. Observation
3. Hypothesis
4. Deduction
5. Experiments
6. Results

1. Recognition of a problem: The first step involves identifying and defining a problem (specific issue or phenomenon) that scientist wants to investigate. For example, a biologist notices that plants in a certain area are growing taller than usual. He develops a scientific problem: "What factors are responsible for the increased growth of these plants?"

2. Observations: Scientists make observations using five senses. They also study previous researches. Observations can be Quantitative (measurable, numbers, more accurate e.g., number of birds) or Qualitative (descriptive, cannot be measured e.g., colour of flower).

3. Hypothesis: A tentative answer to the scientific problem. It should be a proposed statement, match available observations, be testable, and falsifiable.

4. Deductions: Logical results from the hypothesis (usually "if-then" logic). E.g., "If iron deficiency causes yellow leaves, then adding iron should make them green."

5. Experiments: The most basic step. Scientists perform experiments to test hypotheses. Includes an Experimental Group (variable applied) and a Control Group (standard for comparison).

6. Results: Gathering data, statistical analysis, and reporting findings in journals or seminars.

Theory and Law: If a hypothesis is proved by experiments repeatedly, it becomes a Theory (supported by extensive evidence, e.g., Theory of Evolution). If a theory survives doubtful testing and is proven correct again and again, it becomes a Law or Principle (constant fact of nature, e.g., Mendel's Laws).

Q. Describe the steps involved in biological method taking malaria as an example.

Observations: Ancient physicians knew malaria was related to marshy areas, drinking marsh water didn't cause it, and quinine treated it. In 1878, Laveran found Plasmodium in the blood of patients.

Hypothesis: "Plasmodium is the cause of malaria."

Deduction: "If Plasmodium is the cause of malaria, then all malarial patients should have Plasmodium in their blood."

Experiments: Biologists examined blood of 100 malarial patients and 100 healthy persons. Result: All malarial patients had Plasmodium; healthy ones did not (except a few in incubation period).

Spread of Malaria (A.F.A King's Work):

• Observations: People outdoors got malaria more than indoors; those with nets got it less; those near smoke got it less.
• Hypothesis: "Mosquitoes transmit Plasmodium and are involved in the spread of malaria."
• Deduction: "If mosquitoes spread malaria, then Plasmodium should be present in mosquitoes."
• Ronald Ross Experiments (1880s): He allowed a female Anopheles mosquito to bite a malarial patient, killed it, and found multiplying Plasmodium in its stomach. He then used sparrows (to avoid human risk): allowed Culex mosquitoes to bite infected sparrows, then healthy ones. The healthy sparrows got malaria.
• Confirmation in Humans: In 1898, Italian biologists allowed an infected Anopheles to bite a healthy man, who then got malaria.