JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD Pharm. D I Year REMEDIAL BIOLOGY Previous Question Paper (October/November - 2020 - R08)

A eukaryotic plant cell is characterized by a rigid cell wall and membrane-bound organelles. The structure includes: 1) Cell Wall: An outer layer composed of cellulose providing structural support. 2) Plasma Membrane: A semi-permeable lipid bilayer regulating molecular transport. 3) Nucleus: The control center containing genetic material (DNA) within a nuclear envelope. 4) Chloroplasts: Specialized organelles containing chlorophyll for photosynthesis. 5) Vacuole: A large central compartment maintaining turgor pressure and storage. 6) Mitochondria: The powerhouse of the cell responsible for ATP production via cellular respiration. 7) Endoplasmic Reticulum and Golgi Apparatus: Involved in protein synthesis, lipid metabolism, and intracellular transport. 8) Cytoplasm: The jelly-like matrix housing these organelles.

Diagram description: The cell is depicted as a rectangular structure with a thick outer cell wall. Inside, a large central vacuole occupies most of the space, pushing the nucleus to the periphery. Chloroplasts are shown as oval structures with internal stacks (thylakoids), and mitochondria are shown with internal cristae.

The primary objectives of plant taxonomy are: 1) Identification: Determining the correct identity of a plant specimen. 2) Nomenclature: Assigning standardized scientific names according to the International Code of Nomenclature for algae, fungi, and plants. 3) Classification: Grouping plants into hierarchical categories based on similarities and evolutionary relationships. 4) Phylogeny: Establishing the evolutionary history and relationships between different plant groups.

Botanical classifications are categorized into three main types: 1) Artificial Classification: Based on one or a few morphological characters (e.g., Linnaeus's sexual system). 2) Natural Classification: Based on a large number of morphological and anatomical characters to reflect natural affinities (e.g., Bentham and Hooker system). 3) Phylogenetic Classification: Based on evolutionary descent and genetic relationships, representing the most modern approach (e.g., Engler and Prantl or Hutchinson systems).