Assignments

Introduction Biotic stress refers to the negative impact on plants caused by living organisms such as bacteria, fungi, viruses, insects, nematodes, and weeds. These stressors interfere with normal plant growth, development, and productivity. Unlike abiotic stress (caused by non-living factors like drought or temperature), biotic stress is triggered by biological entities that compete for nutrients,

Introduction Plant tissue culture is a method used to grow plant cells, tissues, or organs under sterile conditions on a nutrient medium. Two important techniques within this field are organ culture and cell suspension culture. These methods are widely used in research, biotechnology, and agriculture for cloning plants, conserving rare species, and producing valuable compounds.

Introduction Phenolics, also known as phenolic compounds or polyphenols, are a large group of secondary metabolites produced by plants. These compounds contain one or more aromatic rings with hydroxyl groups and play diverse roles in plant growth, development, and defense. Phenolics are not directly involved in primary metabolism like respiration or photosynthesis, but they are

Introduction Plant growth regulators (PGRs), also known as phytohormones, are chemical substances produced by plants that influence various physiological processes such as growth, development, flowering, fruiting, and response to stress. Traditionally, well-known plant hormones include auxins, gibberellins, cytokinins, abscisic acid, and ethylene. However, in recent years, scientists have discovered several novel endogenous (produced within the

Introduction The coleoptile tip experiment is one of the most famous experiments in plant biology. It was first conducted by Charles Darwin and his son Francis Darwin in the late 19th century. This experiment played a foundational role in the discovery of plant hormones, especially auxins, which are responsible for plant growth and development. The

Introduction Seed storage proteins are a vital group of proteins that are synthesized and stored in seeds during their development. These proteins serve as a reserve source of nitrogen, carbon, and sulfur, which are used by the developing plant embryo during germination and early seedling growth. They are essential for seed viability, seedling vigor, and

Introduction Ammonia assimilation is the process through which plants incorporate ammonium ions (NH4+) into organic compounds. It is a critical part of nitrogen metabolism, especially after biological nitrogen fixation or nitrate reduction. One of the pathways used for ammonia assimilation in plants is the GDH (Glutamate Dehydrogenase) pathway. While the GS-GOGAT pathway is the main