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*IJMB BIOLOGY* *NUMBER FIVE* (5a) Potato blight: Potato blight is a serious plant disease that affects potatoes and is caused by a fungus-like organism known as Phytophthora infestans. It spreads rapidly under cool and wet conditions, attacking leaves, stems, and tubers. The disease causes dark patches on leaves which later rot and collapse, leading to a significant reduction in crop yield. In severe cases, it can destroy an entire potato farm if not properly controlled. Control measures include the use of resistant varieties, proper field hygiene, crop rotation, and application of fungicides. (5b) Climate Change: Climate change is the long-term alteration in the average weather conditions of the Earth, such as temperature, rainfall, and wind patterns. It is mainly caused by increased concentrations of greenhouse gases like carbon dioxide and methane due to human activities such as burning fossil fuels, deforestation, and industrial processes. Climate change leads to effects such as rising global temperatures, melting ice caps, sea level rise, droughts, floods, and disruption of ecosystems. It can also affect agriculture, water supply, and human health. Mitigation measures include afforestation, reduced carbon emissions, and the use of renewable energy sources.

*IJMB BIOLOGY* *NUMBER TWO* (2a) Lichens: Lichens are composite organisms formed by a symbiotic association between a fungus and an alga or cyanobacterium. The fungal partner provides protection, water, and minerals, while the algal partner carries out photosynthesis and supplies food. Lichens commonly grow on rocks, tree bark, and walls and are important indicators of air quality. (2b) Air Pollution: Air pollution is the contamination of the atmosphere by harmful substances, including smoke, dust, gases, and industrial emissions. Major sources include vehicle exhausts, factory emissions, bush burning, and fossil fuel combustion. Air pollution can cause respiratory diseases, damage plants and animals, and contribute to global warming and acid rain. (2c) Heterospory: Heterospory is the production of two different types of spores by the same plant, namely microspores (male spores) and megaspores (female spores). This condition occurs in some pteridophytes and seed plants. Heterospory represents an important evolutionary step toward the development of seeds and the emergence of separate male and female gametophytes. (2d) Asexual Reproduction: Asexual reproduction is a mode of reproduction in which offspring are produced from a single parent without the fusion of gametes. The offspring are genetically identical to the parent. Common methods include binary fission, budding, fragmentation, spore formation, and vegetative propagation. It allows rapid multiplication and colonization of suitable environments.

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