Biology Form Four - 100 Homework Questions & 25-Question Model Exam

Form Four Biology represents the pinnacle of Ordinary Level secondary science education, integrating biological principles into advanced molecularmechanisms, evolutionary biology, vertebrate taxonomy, and public health immunology. Developed strictly in accordance with the Tanzania
Institute of Education (TIE) Certificate of Secondary Education Examination (CSEE) Biology Syllabus and the curriculum framework curated on the
Dadisi Digital Library (Grade 4 Biology), this comprehensive workbook covers all 5 official syllabus topics:
• Growth: Concept and parameters of biological growth; dry mass versus fresh mass; mitotic cell division and tissue repair; sigmoid growth curves;
epigeal and hypogeal seed germination; environmental prerequisites for germination; seed dormancy and methods of breaking it; apical and lateral
meristems; primary and secondary growth in dicot stems; annual rings and dendrochronology; plant hormones (auxins, gibberellins, cytokinins,
ethylene, abscisic acid); phototropism and the Cholodny-Went hypothesis; complete versus incomplete metamorphosis in insects; ecdysis and
hormonal regulation; auxanometers; and photoperiodism.
• Genetics: Fundamental genetic terminology (genes, alleles, genotypes, phenotypes, homozygous, heterozygous, dominance, recessiveness);
Mendel's First Law of Segregation and monohybrid crosses; test crosses and backcrosses; Mendel's Second Law of Independent Assortment and
dihybrid inheritance; incomplete dominance versus codominance; multiple alleles and the ABO blood group system; Rhesus incompatibility and
erythroblastosis fetalis; chromosomal basis of sex determination; X-linked sex linkage (hemophilia and red-green color blindness); pedigree charts;
gene mutations versus chromosomal aberrations; molecular etiology of sickle-cell anemia and heterozygote advantage against malaria; Down
syndrome, Turner syndrome, and Klinefelter syndrome; continuous versus discontinuous variation; and practical applications in selective breeding,
recombinant DNA technology, and forensic DNA fingerprinting.
• Classification of Living Things (Kingdom Animalia - Phylum Chordata): Diagnostic characteristics of Phylum Chordata; comparative anatomy,
respiration, and circulation in Class Chondrichthyes versus Class Osteichthyes; amphibian adaptations for dual terrestrial-aquatic life; reptilian
adaptations for arid land colonization (scaly skin, amniotic cleidoic eggs); avian flight adaptations (pneumatized bones, flight muscles, air sacs);
mammalian synapomorphies (mammary glands, hair pelage, ear ossicles, muscular diaphragm); comparative reproduction in Monotremata,
Marsupialia, and Eutheria; mammalian orders (Primates, Carnivora, Artiodactyla, Rodentia, Lagomorpha, Chiroptera, Cetacea); dentition in
herbivores versus carnivores; thermoregulatory adaptations; bipedalism in hominids; economic and ecological roles of mammals; keystone
predators; and wildlife conservation in Tanzania.
• Evolution: Concept of organic evolution; microevolution versus macroevolution; Lamarck's theory of use and disuse and its scientific refutation by
August Weismann; Charles Darwin's Theory of Natural Selection; the Modern Synthetic Theory (Neo-Darwinism); paleontological fossil records and
transitional fossils (Archaeopteryx, horse phylogeny); comparative anatomy (homologous structures and divergent evolution, analogous structures
and convergent evolution, vestigial structures); comparative embryology and molecular evidence (cytochrome c, DNA hybridization); natural
selection in action (industrial melanism, antibiotic resistance); genetic drift (bottleneck and founder effects); stabilizing, directional, and disruptive
selection; allopatric versus sympatric speciation; and reproductive isolating mechanisms.
• Human Immunodeficiency Virus (HIV) and AIDS: Distinction between HIV infection and clinical AIDS; molecular structure of the HIV retrovirus
(gp120/gp41, capsid p24, RNA genome, reverse transcriptase, integrase, protease); replication cycle in CD4+
T helper lymphocytes; modes of
transmission and misconceptions; WHO clinical stages; opportunistic infections (Tuberculosis, Candidiasis, Kaposi sarcoma); diagnostic tests (Rapid
tests, ELISA, Viral load PCR, CD4 monitoring); Antiretroviral Therapy (ART) and classes of ARVs (NRTIs, INSTIs, PIs); U=U (Undetectable =
Untransmittable); Post-Exposure Prophylaxis (PEP) and Pre-Exposure Prophylaxis (PrEP); Prevention of Mother-to-Child Transmission (PMTCT);
Voluntary Counseling and Testing (VCT); care and nutritional support for PLWHA; stigma elimination; socio-economic impacts on households and
Tanzanian agriculture; UNAIDS 95-95-95 targets; and TACAIDS national policy frameworks.